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

iii. Sporangia short, jet- or

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violet-black 6. _S. nigrescens_

_b._ Spore-mass rich brown.

1. Columella central.

i. Sporangia shorter, 5-6 mm., spores banded 7. _S. virginiensis_

ii. Sporangia 8-10 mm.; spores verruculose 8. _S. webberi_

iii. Sporangia tall, 15-20 mm. or more 9. _S. splendens_

2. Columella eccentric, sporangium in cross-section, angular 10. _S. fenestrata_

_c._ Spore-mass ferruginous; sporangia in tufts.

1. Spores smooth or nearly so.

i. Sporangia pale, small, 3-5 mm., crowded, stipe unpolished 11. _S. smithii_