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

xxxx. Stipe generally distinctly fluted

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+ Sporangia laterally compressed, fan-shaped 38. _P. compressum_

++ Sporangia typically globose, umbilicate below, connate, etc., strongly calcareous 39. _P. notabile_

+++ Sporangia reniform, concave below _P. affine_, see under 38

++++ Sporangia larger, to 1 mm., nearly limeless, iridescent 40. _P. tropicale_

oooo Sporangia obovate, compound, clustered, the stipe fuscous, fluted, short. 41. _P. nicaraguense_

OOOO Sporangia yellow, rarely iridescent or brown.

o Capillitial nodes white.

x. Stipe also white 42. _P. sulphureum_