The North American Slime-Moulds A Descriptive List of All Species of Myxomycetes Hitherto Reported from the Continent of North America, with Notes on Some Extra-Limital Species

ii. Columella long, 4-5 the sporangium

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non-calcareous. 26. _P. penetrale_

iii. Columella large globose 27. _P. luteo-album_

_b._ Sporangia without columella.

i. Sporangia nucleate, calcareous at center.

O Stipe yellow 28. _P. nucleatum_

OO Stipe white 29. _P. wingatense_

ii. Sporangia non-nucleate.

O Sporangia purple 30. _P. newtoni_

OO Sporangia blue, spotted with red 31. _P. psittacinum_

OOO Grey or white, iridescent betimes.

o Sporangia white, discoidal; stipe yellow 32. _P. discoidale_

oo Sporangia lightly calcareous, iridescent, sub-globose, diam. about = to the stout, brown, slightly wrinkled stipe 33. _P. leucophaeum_

ooo Sporangia globose or sub-globose.

x. Small, .5 mm.

+ Stipe erect, clear brown 34. _P. nodulosum_

++ Stipe weak, yellow, stuffed 35. _P. maculatum_