Part 38

=A. amabile= (lovely). _sti._ scattered, 6in. to 12in. long, slightly scaly below. _fronds_ 1ft. or more long, 6in. to 12in. broad, with a lanceolate terminal pinna, and three to six lateral ones on each side, which are 3in. to 6in. long, 1in. to 1-1/2in. broad, the lowest sometimes divided at the base; segments sub-rhomboidal, with at least half the lower side cut away, the upper side and part of the lower lobed and sharply spinuloso-serrated. sori sub-marginal. Ceylon. Stove species. SYN. _Polystichum amabile_.

=A. angulare= (angular). The Soft Shield Fern. Botanically this is only a variety of _A. aculeatum_; but, to the cultivator, it is abundantly distinct. The fronds are not so tapered at the base, the pinnules are more equal in size, and the lower ones distinctly stalked, while the texture is much less rigid than in _A. aculeatum_, the caudex has a tendency to elongate. Almost cosmopolitan in its distribution. SYN. _Polystichum angulare_. There are an enormous number of varieties, many of which are not under cultivation. Amongst the best found in gardens are _alatum_, _Bayliæ_, _concinnum_, _corymbiferum_, _cristatum_, _curtum_, _dissimile_, _grandiceps_, _imbricatum_, _Kitsoniæ_, _lineare_, _parvissimum_, _plumosum_, _polydactylon_, _proliferum_, _rotundatum_, _Wakeleyanum_, _Woollastoni_.

=A. a. grandiceps= (large-crested). This is a narrow fronded variety, having the apices of the fronds branched and crested, ultimately producing a broad tasselled head. A very handsome fern. See Fig. 167.

=A. anomalum= (anomalous). _sti._ tufted, 1ft. to 2ft. long, densely scaly below. _fronds_ 2ft. to 3ft. long, 1ft. or more broad; lower pinnæ 6in. to 9in. long, 2in. to 3in. broad; pinnules lanceolate, cut down in the lower part into oblong segments; teeth blunt or slightly mucronate. _sori_ placed near the sinuses of the pinnules. Ceylon. Stove species. SYN. _Polystichum anomalum_.

=A. aristatum= (awned).* _rhiz._ creeping. _sti._ scattered, 9in. to 18in. long, very scaly below. _fronds_ 1ft. to 2ft. long, 9in. to 12in. broad, ovate-deltoid, tri- or quadripinnatifid; lower pinnæ largest, 4in. to 6in. long, 2in. to 3in. broad; lowest pinnules much the largest, lanceolate-deltoid; teeth copious aristate. _sori_ small, principally in two rows near the midrib. Japan, Himalayas, New South Wales, &c. Greenhouse species. SYN. _Polystichum aristatum_.

=A. a. coniifolium= (Conium-leaved).* _fronds_ more finely divided; segments copiously toothed, with lower lobes distinct.

=A. a. variegatum= (variegated).* A handsome variety, with a broad band of green running through the bases of the pinnules along the course of the rachis.

=A. auriculatum= (eared).* _sti._ tufted, 4in. to 6in. long, scaly below or throughout. _fronds_ 12in. to 18in. long, 2in. to 4in. broad; pinnæ numerous, sub-sessile, usually close, 1in. to 2in. long, about 1/2in. broad, ovate-rhomboidal, falcate, acute, spinoso-serrated, the upper base auricled, the lower one truncate. _sori_ in two rows. India, widely distributed. Stove species. SYNS. _A. ocellatum_, _Polystichum auriculatum_.

=A. a. lentum= (pliant). Pinnæ cut into oblong mucronate lobes about half-way down to the rachis, the auricle sometimes quite free.

=A. a. marginatum= (margined).* A variety with more coriaceous texture; upper edge of the pinnæ slightly lobed.

=A. capense= (Cape).* _sti._ scattered, 1ft. to 2ft. long, densely scaly below. _fronds_ 1ft. to 3ft. long, 12in. to 18in. broad, sub-deltoid; lowest pinnæ the largest, 6in. to 9in. long, 3in. to 4in. broad; pinnules and segments lanceolate, the latter bluntly lobed. _sori_ very large and copious. South America, New Zealand, Cape Colony, Natal, &c. Greenhouse species. SYNS. _A. coriaceum_, _Polystichum capense_.

=A. confertum= (compressed). Synonymous with _A. meniscioides_.

=A. coriaceum= (leathery). Synonymous with _A. capense_.

=A. falcatum= (hooked).* _sti._ tufted, 6in. to 12in. long, densely scaly below. _fronds_ 1ft. to 2ft. long, 6in. to 9in. broad, simply pinnate; pinnæ numerous, the lower stalked, ovate-acuminate, falcate, 3in. to 5in. long, 1in. to 2in. broad; edge entire or slightly undulated, the upper side narrowed suddenly, sometimes auricled, the lower rounded or obliquely truncate at the base. _sori_ small, copious, scattered. Japan, China, Himalayas, &c. SYN. _Cyrtomium falcatum_.

=A. f. caryotideum= (Caryota-like) has pinnæ sometimes larger, sharply toothed, slightly lobed, sometimes auricled on both sides. SYN. _Cyrtomium caryotideum_.

=A. f. Fortunei= (Fortune's).* This differs from the type in having pinnæ narrower and more opaque. All are most useful house ferns, and quite hardy in many parts of the country. SYN. _Cyrtomium Fortunei_.

=A. falcinellum= (finely-hooked).* _sti._ tufted, 4in. to 8in. long, densely scaly. _fronds_ 9in. to 18in. long, 3in. to 6in. broad; central pinnæ 2in. to 3in. long, 1/4in. broad; point acute; edge finely serrated; the upper side bluntly auricled, the lower obliquely truncate at the base. _sori_ in two long rows. Madeira. Greenhouse species. SYN. _Polystichum falcinellum_.

=A. flexum= (bending). _rhiz._ stout, wide-creeping. _sti._ scattered, 1ft. long, scaly. _fronds_ 2ft. to 3ft. long, 9in. to 12in. broad; lower pinnæ lanceolate-deltoid, 4in. to 6in. long, 2in. to 4in. broad; pinnules lanceolate-deltoid, cut down to the rachis below into oblong bluntly-lobed segments. _sori_ large, in two rows, copious. Juan Fernandez. Stove species. SYN. _Polystichum flexum_.

=A. fœniculaceum= (Fennel-leaved).* _rhiz._ creeping. _sti._ scattered, 6in. to 12in. long, densely scaly below. _fronds_ 1ft. to 2ft. long, and 9in. to 12in. broad, lanceolate-deltoid, four to five pinnatifid; lower pinnæ 6in. to 8in. long, 3in. to 4in. broad; ultimate divisions linear, awned, with a firm texture. _sori_ solitary. Greenhouse species. Sikkim, 7,000ft. to 10,000ft. SYN. _Polystichum fœniculaceum_.

=A. frondosum= (leafy). _sti._ scattered, 1ft. to 2ft. long, densely scaly below. _fronds_ 18in. to 24in. long, 1ft. or more broad, sub-deltoid; lower pinnæ much the largest, long stalked; pinnules lanceolate; segments very unequal sided, pinnatifid, with rounded mucronate lobes, obliquely truncate at the base below. _sori_ large, copious. Madeira. Greenhouse species. SYN. _Polystichum frondosum_.

=A. Hookeri= (Hooker's). _sti._ 1ft. or more long, naked. _fronds_ 2ft. to 3ft. long; pinnæ 6in. to 8in. long, 1in. broad, cut down to a broadly-winged rachis into nearly close, spreading, entire, linear-oblong lobes 1/8in. broad. _sori_ nearer the edge than the midrib. Malay Archipelago. Stove species. SYNS. _A. nephrodioides_ and _Cyclodium Hookeri_.

=A. laserpitiifolium= (Laserpitium-leaved).* _sti._ 4in. to 6in. long, stramineous, scaly at base. _fronds_ 12in. to 18in. long, 6in. to 9in. broad, ovate-deltoid, tripinnate; lower pinnæ the largest, with pinnules on the lower side prolonged, lanceolate, imbricated with small, distinct, bluntly-lobed segments. _sori_ in two rows, very copious. Japan. A very desirable greenhouse species. SYNS. _Lastrea Standishii_ (of gardens) and _Polystichum laserpitiifolium_.

=A. lepidocaulon= (scaly-stemmed). _sti._ tufted, 6in. to 9in. long, densely clothed with large cordate scales. _fronds_ 1ft. or more long, 4in. to 6in. broad, sometimes elongated and rooting at the point: pinnæ 2in. to 3in. long, 1/2in. to 3/4in. broad, lanceolate-falcate, the two sides unequal, the upper one auricled at the base. _sori_ principally in two rows, near the midrib. Japan. Greenhouse species. SYN. _Polystichum lepidocaulon_.

=A. Lonchitis= (spar-like).* The Holly Fern. _sti._ densely tufted, 1in. to 4in. long, scaly at base. _fronds_ 1ft. to 2ft. long, 1in. to 3in. broad, pinnate throughout; pinnæ 1/2in. to 1-1/2in. long, 1/4in. to 1/2in. broad, ovate-rhomboidal, sub-falcate, the two sides unequal, point mucronate, edge spinuloso-serrated, the upper side sharply auricled at the base, the lower obliquely truncate. Britain, &c. A very widely-spread hardy species. SYN. _Polystichum Lonchitis_.

=A. meniscioides= (Meniscium-like). _sti._ 1ft. to 2ft. long, scaly below. _fronds_ 2ft. to 3ft. long, 1ft. or more broad, pinnate; barren pinnæ sessile, 6in. to 9in. long, 1-1/2in. to 2in. broad, oblong-acuminate, nearly entire; fertile pinnæ much smaller. _sori_ in two close rows between the primary veins. West Indies, &c. Stove species. SYNS. _A. confertum_ and _Cyclodium meniscioides_.

=A. mohrioides= (Mohria-like). _sti._ tufted, 2in. to 6in. long, more or less densely scaly. _fronds_ 6in. to 12in. long, 2in. to 3in. broad, bipinnate; pinnæ numerous, frequently imbricated, lanceolate, cut down below into slightly toothed, oblong-rhomboidal pinnules. _sori_ copious. Patagonia and the Cordilleras of Chili. Greenhouse species. SYN. _Polystichum mohrioides_.

=A. mucronatum= (mucronated).* _sti._ tufted, 2in. to 4in. long, densely scaly. _fronds_ 12in. to 18in. long, 1-1/2in. to 2in. broad, pinnate throughout; pinnæ very numerous, often imbricated, 3/4in. to 1in. long, 1/4in. to broad, sub-rhomboidal, unequal-sided, mucronate, sub-entire, distinctly auricled at the upper base. _sori_ in a long row on each side the midrib. West Indies. Stove or greenhouse species. SYN. _Polystichum mucronatum_.

=A. munitum= (armed).* _sti._ tufted, 4in. to 9in. long, densely scaly. _fronds_ 1ft. to 2ft. long, 4in. to 8in. broad; pinnæ close, 2in. to 4in. long, about 1/2in. broad, acuminate, finely spinulose and serrated throughout, the upper side auricled, and the lower obliquely truncate at the base. _sori_ in two rows near the edge. California, &c. Hardy; very fine. SYN. _Polystichum munitum_.

=A. nephrodioides= (Nephrodium-like). Synonymous with _A. Hookeri_.

=A. ocellatum= (spotted). Synonymous with _A. auriculatum_.

=A. pungens= (stinging). _rhiz._ stout. _sti._ scattered, 1ft. long, scaly below only. _fronds_ 2ft. to 3ft. long, 9in. to 12in. broad; lower pinnæ 4in. to 6in. long, 2in. to 3in. broad; pinnules ovate-rhomboidal, unequal-sided, often deeply pinnatifid. _sori_ principally in two rows near the midrib. Cape Colony. Greenhouse species. SYN. _Polystichum pungens_.

=A. repandum= (wavy-leaved). _sti._ 1ft. to 2ft. long, naked. _fronds_ 2ft. or more long, 12in. to 18in. broad, apex deeply pinnatifid, with linear-oblong, slightly sinuated lobes; lower pinnæ four to eight on each side, 6in. to 8in. long, 1-1/4in. to 1-1/2in. broad, acuminate; edge bluntly sinuated, the lowest stalked and forked. _sori_ in two distinct rows near the main vein. Philippines. Stove species.

=A. rhizophyllum= (frond-rooting). _sti._ tufted, 1in. to 2in. long, slender. _fronds_ 2in. to 6in. long, 3/4in. broad, with the long, narrow upper half of the frond lengthened out and rooting, the lower half cut down to a flattened fibrillose rachis into oblong-rhomboidal sub-entire lobes about 1/2in. broad, 1/4in. deep. _sori_ scattered. Jamaica, 1820. Stove or cool house species. SYN. _Polystichum rhizophyllum_.

=A. semicordatum= (half-cordate). _sti._ scattered, 6in. to 12in. long. _fronds_ 2ft. to 3ft. long, 8in. to 12in. broad, simply pinnate; pinnæ spreading, 4in. to 6in. long, 1/2in. to 3/4in. broad, nearly entire, acuminate, cordate or truncate at the base. _sori_ in one to three rows on each side, the inner one close to the midrib. Tropical America, &c. SYN. _Polystichum semicordatum_.

=A. trapezioides= (Trapezium-like). Synonymous with _A. viviparum_.

=A. triangulum= (triangular).* _sti._ tufted, 2in. to 6in. long, base scaly. _fronds_ 1ft. or more long, 1-1/2in. to 2in. broad; pinnæ numerous, sessile, lower ones distant, central ones 3/4in. to 1in. long, about 5/8in. broad, sub-deltoid, lower side obliquely truncate; apex mucronate, edge sub-entire or slightly lobed, with blunt or spinose teeth, one or both sides auricled at the base. _sori_ principally in two rows near the edge. West Indies. Stove or greenhouse species. SYN. _Polystichum triangulum_.

=A. trifoliatum= (three-leaved). _sti._ tufted, 1ft. or more long, base only scaly. _fronds_ 12in. to 18in. long, 6in. to 12in. broad, with a large ovate-acuminate terminal pinna, narrowed or forked at the base, and one or two lateral ones on each side, the lowest mostly forked. _sori_ in rows near the main veins. Tropical America. Stove species.

=A. t. heracleifolium= (Heracleum-leaved). A form with pinnæ pinnatifid on both sides at the base.

=A. tripteron= (three-winged). _sti._ 6in. to 9in. long, densely scaly at base. _fronds_ 12in. to 18in. long, with a large terminal and two small spreading lateral pinnæ at the base of it, the former 2-1/2 in. to 3in. broad, with very numerous spreading pinnules on each side, 1-1/2in. long, about 1/2in. broad, unequal sided, acute, deeply inciso-pinnatifid, the lower lobes again toothed; lateral pinnæ 3in. to 5in. long, 1-1/2in. to 2in. broad. _sori_ principally in two rows midway between midrib and edge. Japan. Greenhouse species. SYN. _Polystichum tripteron_.

=A. varium= (variable).* _rhiz._ sub-creeping. _sti._ 6in. to 12in. long, densely fibrillose below. _fronds_ 12in. to 18in. long, 9in. to 12in. broad, lanceolate-deltoid; lower pinnæ much the largest, sub-deltoid, unequal sided, 4in. to 6in. long, 3in. to 4in. broad; pinnules lanceolate, imbricated, with oblong, blunt, slightly toothed segments. _sori_ principally in two rows near the midrib. Japan. Greenhouse species. SYNS. _Lastrea varia_ and _Polystichum varium_. It is frequently met with in gardens under the former name.

=A. viviparum= (bud-producing). _sti._ tufted, 4in. to 6in. long, scaly at the base. _fronds_ 12in. to 18in. long, 4in. to 6in. broad; pinnæ numerous, nearly lanceolate, the central ones 2in. to 3in. long, about 1/2in. broad, mucronate, sometimes bud-bearing, the edge more or less deeply lobed, in the lower part sometimes quite down to the rachis, the upper side auricled. _sori_ in two or four rows. West Indies. Stove or greenhouse species. SYNS. _A. trapezioides_ and _Polystichum viviparum_.

=ASPLENIUM= (from _a_, not, and _splen_, spleen; referring to the medicinal properties formerly attributed to the genus). Spleenwort. ORD. _Filices_. Including _Anisogonium_, _Athyrium_, _Ceterach_, _Cænopteris_, _Darea_, _Diplazium_, _Hemidictyum_, _Neottopteris_. A very large and widely-spread genus, including species suitable for the stove, temperate, and hardy ferneries. Sori dorsal or submarginal, linear or oblong. Involucre similar in shape, straight or occasionally curved, single or double, plane or tumid, bursting along the outer edge. The tropical species should be grown in a compost of peat, loam, and sand; the hardy sorts in a mixture of fibrous peat and sand. Good drainage is at all times required. For general culture, _see_ =Ferns=.

=A. abscissum= (clipped). _sti._ tufted, 4in. to 8in. long. _fronds_ 6in. to 12in. long, 3in. to 4in. broad, sometimes proliferous at the apex, with twelve to twenty horizontal pinnæ on each side, which are 1-1/2in. to 2in. long, about 1/2in. broad, bluntish; edge inciso-crenate, the upper one narrowed suddenly at the base, the lower one obliquely truncate. _sori_ short, in two regular rows, falling short of both midrib and edge. Tropical America. Stove species. SYN. _A. firmum_.

=A. acuminatum= (taper-pointed).* _sti._ 6in. to 9in. long. _fronds_ 1ft. to 2ft. long, 9in. to 12in. broad, with very numerous close-placed lanceolate-oblong pinnæ on both sides, which are 4in. to 6in. long, 1-1/2in. to 2in. broad; pinnules numerous, unequal-sided, lanceolate, acuminate; edges sharply toothed, the lower base obliquely truncate. _sori_ in two rows in the upper part, of the pinnules, often diplazioid. Sandwich Islands. Greenhouse species. SYN. _A. polyphyllum_.

=A. Adiantum-nigrum= (Black Spleenwort). _sti._ tufted, 6in. to 9in. long. _fronds_ 6in. to 12in. long, 4in. to 6in. broad sub-deltoid; lower pinnæ deltoid, 2in. to 3in. long, 1-1/2in. to 2in. broad; all the pinnæ pinnate. _sori_ copious, at last often occupying the whole under surface of the segments. Great Britain. World-wide in its distribution. Hardy. _A. solidum_, from Cape Colony, is supposed to be a mere form of this species. There are several varieties the best of which are described below. See Fig. 168.

=A. A.-n. acutum= (acute). _fronds_ 9in. to 15in. long, deltoid, tripinnate; ultimate segments linear, and very acute. Ireland. A copiously divided and very elegant variety. Habit more graceful than the type.

=A. A.-n. grandiceps= (large-crested). _fronds_ 6in. to 12in. long; pinnæ comparatively short, and slightly crested; apex freely divided, and expanded into a broad crest, which gives the frond a very graceful contour. Frame or greenhouse variety. See Fig. 169.

=A. A-n. oxyphyllum= (sharp-leaved). _fronds_ 4in. to 6in. long, ovate-lanceolate; ultimate segments narrow and very acute. A very pretty little variety.

=A. affine= (related). _sti._ 6in. to 12in. long. _fronds_ 12in to 18in. long, 6in. to 12in. broad, bipinnate, with numerous pinnæ on each side, the lower ones lanceolate-rhomboidal; pinnules rhomboidal, inciso-serrate. _sori_ copious, linear. Mascaren Islands, &c. Stove or warm greenhouse species. SYN. _A. spathulinum_.

=A. alatum= (winged).* _sti._ 4in. to 6in, long, slender, the upper part and the rachis, winged. _fronds_ 1ft. to 1-1/2ft. long, 3in. to 4in. broad, with twelve to twenty horizontal sessile pinnæ on each side, which are 1in. to 1-1/2in. long, and about 1/2in. broad, bluntish; edge uniformly inciso-crenate, the base nearly equal on both sides. _sori_ distant, not reaching either the midrib or edge. West Indies, &c. A very elegant stove species.

=A. alismæfolium= (Alisma-leaved). _sti._ 2in. to 6in. long. _fronds_ varying in shape, from simple oblong-lanceolate, 6in. to 9in. long, 2in. to 3in. broad; apex acuminate; edges entire, to ternate or pinnate, with a large terminal and three pairs of lateral pinnæ, each like the entire frond of the simple state; texture coriaceous. Isle of Luzon. Stove species. SYN. _Anisogonium alismæfolium_.

=A. alternans= (alternated). _sti._ tufted, 1in. to 2in. long. _fronds_ 6in. to 8in. long, 1in. to 1-1/2in. broad, lanceolate-oblong, cut down into numerous bluntly-rounded lobes on each side, which reach very nearly down to the rachis, the lower gradually reduced. _sori_ copious. N. W. Himalayas. Greenhouse species. SYN. _A. Dalhousiæ_.

=A. alternifolium= (alternate-leaved). Synonymous with _A. germanicum_.

=A. angustifolium= (narrow-leaved).* _sti._ tufted, about 1ft. long. _fronds_ 18in. to 24in. long, 4in. to 6in. broad, simply pinnate, lanceolate-oblong, flaccid, with twenty to thirty sub-sessile pinnæ on each side, sterile ones largest, 2in. to 3in. long, 1/2in. broad, acuminate; edge obscurely-crenate, base rounded and equal on both sides; fertile pinnæ narrower and more distant. _sori_ very close and regular, extending from the midrib nearly to the edge. Canada, &c. Greenhouse species.

=A. anisophyllum= (unequal-leaved). _sti._ tufted, 6in. to 12in. long. _fronds_ 1ft. to 2ft. long, 6in. to 9in. broad, oblong-lanceolate, simple pinnate, with ten to sixteen sub-sessile pinnæ on each side which are 3in. to 5in. long, about 1in. broad, acuminated, crenate, the two sides unequal, the upper one narrowed suddenly, the lower one obliquely truncate at the base. _sori_ distant, elliptical, reaching half-way from the edge to the margin. Cape Colony, &c. Greenhouse species.

=A. apicidens= (apex-toothed). A variety of _A. Vieillardii_.

=A. arborescens= (tree-like). _cau._ oblique. _sti._ 1ft. to 2ft. long. _fronds_ 3ft. to 4ft. long, 2ft. to 3ft. broad, deltoid, tripinnatifid, with numerous pinnæ, the lower ones 12in. to 18in. long, 4in. to 6in. broad; pinnules 3in. long, about 1/2in. wide, acuminate, edge cut two-thirds of the way down to the rachis into nearly entire lobes, 1/4in. deep, 1/8in. broad. Lower _sori_ 1/8in. long. Mauritius, &c., 1826. Stove species. SYN. _Diplazium arborescens_.

=A. Arnottii= (Arnott's). _sti._ smooth, angular. _fronds_ ample, tripinnatifid; lower pinnæ 9in. to 12in. long, 4in. to 6in. broad; pinnules 3in. to 4in. long, 1in. or more broad, cut down below to a distinctly winged rachis into deeply crenate, blunt, oblong lobes, 1/2in. deep, 1/4in. broad. _sori_ copious, nearly all diplazioid, and filling up when mature nearly the whole surface of the lobes. Sandwich Islands, 1877. Greenhouse species. SYNS. _A. diplazioides_ and _Diplazium Arnottii_.

=A. aspidioides= (Aspidium-like). _sti._ tufted, 6in. to 12in. long. _fronds_ 1ft. to 2ft. long, 8in. to 12in. broad, ovate-deltoid, tripinnatifid; lower pinnæ 6in. to 8in. long, lanceolate-deltoid; pinnules lanceolate, cut down below nearly to the rachis into inciso-pinnatifid ovate segments, two lines broad. _sori_ copious, oblong, the lower ones curved. Tropical America, &c. Greenhouse species. SYN. _A. multisectum_.

=A. attenuatum= (attenuated). _sti._ tufted, 3in. to 4in. long. _fronds_ simple, linear-lanceolate, about 1ft. long, about 1/2in. broad, narrowed upwards very gradually, sometimes proliferous at the point, the margin toothed; the lower third also lobed; the lowest roundish, lobes reaching down nearly or quite to the rachis. _sori_ reaching nearly to the edge. Queensland, &c. Greenhouse species.

=A. aureum= (golden). A variety of _A. Ceterach_.

=A. auriculatum= (auriculated).* _sti._ tufted, 4in. to 8in. long. _fronds_ 12in. to 18in. long, 4in. to 6in. broad, simply pinnate, lanceolate-oblong, with ten to twenty-stalked horizontal pinnæ on each side, which are 2in. to 4in. long, 3/4in. to 1in. broad, lanceolate, often sub-falcate; edge deeply crenate, the two sides unequal, the upper one with a cordate auricle, the lower one obliquely truncate. _sori_ distant, not reaching either the midrib or edge. Tropical America, 1820. Stove species.

=A. auritum= (eared). _sti._ tufted, 4in. to 8in. long. _fronds_ 6in. to 12in. long, 2in. to 4in. broad, simply pinnate, with ten to fifteen stalked horizontal pinnæ on each side, which are 2in. to 3in. long, and about 1/2in. broad, acute or bluntish; edge sharply toothed or often lobed, especially on the upper side towards the base. _sori_ in two broad rather oblique rows. Tropical America. Stove species.

=A. australasicum= (Australian). A variety of _A. Nidus_.