250 NORTH AMERICAN FLORA [VoLUME 9 
20. MARASMIUS* Fries, Gen. Hymen. 9. 1836. 
Eomycenella Atk. Bot. Gaz. 34:37. 1902. 
Mycetinis Earle, Bull. N. Y. Bot. Gard. 5: 414. 1909. 
Collybiopsis Earle, Bull. N. Y. Bot. Gard. 5: 415. 1909. 
Scorieus Earle, Bull. N. Y. Bot. Gard. 5:415. 1909. 
Pileus tough-fleshy to membranous, usually epixylous, reviving when moistened; surface 
variously colored, often sulcate or striate, not zonate, dry, glabrous or rarely minutely tomen- 
tose or pruinose, the margin involute or straight when young: context more or less tough and 
dry, sometimes soft-fleshy but not brittle; lamellae dry, rather thin, often interveined but seldom 
forking, developing slowly, rarely remaining very narrow and almost vein-like: spores hyaline, 
smooth (angular in one species), usually ellipsoid, maturing slowly and unequally so that it is. 
often difficult to find ripe spores in dried plants: stipe central or somewhat eccentric, slender, 
tough, stuffed or hollow: veil none. 
Type species, Marasmius androsaceus (1,.) Fries. 
Species occurring in tropical North America. I. 
Species occurring in temperate North America. Il, 
I. SPECIES OCCURRING IN TROPICAL NORTH AMERICA 
Pileus minute, 1-3 mm. broad (reaching 4 mm. in M. Hioramt). 
Surface of pileus white or whitish, rarely darker on the disk. 
Disk blackish and papillate. 1. M. Peckii. 
Disk white or pallid. 
Stipe 4-10 mm. long. 
Pileus 1-2 mm. broad. 
Surface subpellucid, pruinose. 2. M. petiolorum. 
Surface opaque, glabrous. 3. M. Marblece. 
Pileus 2~3 mm. broad. 
Surface subtranslucent, glabrous. 4. M. subtenerrimus. 
Surface opaque, pulverulent. 5. M. bermudensis. 
Stipe 10-20 mm. long. : 
Pileus umbilicate. 
Stipe pallid, 1-1.5 cm. long. 6. M. theobromicola. 
Stipe fulvous, 2.5 em. or more long. 7. M. chrysochaetes. 
Pileus not umbilicate. 
Stipe pallid throughout. 8. M. proletarius. 
Stipe pale-yellow below. 9. M. inaequalis. 
Surface of pileus pale-yellow. 
Lamellae adnate; pileus 3 mm. broad. 10. M. subglobosus. 
Lamellae decurrent; pileus 1 mm. broad. 11, M. flaveilus. 
Surface of pileus brownish-cinnamon; pileus convex; lamellae distant, 
pallid; stipe 2 mm. long. 12. M. nanus. 
Surface of pileus umbrinous; pileus hemispheric; lamellae few, pallid. 13. M. guyanensis. 
Surface of pileus bay, blackish and papillate at the center; pileus 2-4 
mm. broad. 14. M. Hiorami. 
Pileus small, 3-10 mm. broad. 
Surface of pileus white or pallid, rarely slightly darker at the center. 
Stipe white or pallid throughout. 
Stipe glabrous. 
Lamellae free; stipe 10-12 mm. long. 15. M. stylobates. 
Lamellae decurrent; stipe 1.5-4 cm. long. 
Stipe 1.5-2 cm. long. 16, M. praedecurrens. 
_ Stipe 4 cm. long. 17. M. niveicolor. 
Stipe minutely pruinose or floccose, sometimes becoming sub- 
glabrous. 
Pileus scarcely 5 mm. broad, not striate; lamellae crowded. 18. M. seiulosipes. 
Pileus 6-10 mm. broad, striate; lamellae distant. 19. M. synodicus. 
Stipe brownish or blackish below. 
Stipe 1 cm. or less long. 
Lamellae adnate; pileus usually darker on the disk. 20. M. Earlei. 
Lamellae decurrent; pileus not darker on the disk. 21. M. pruinosulus. 
Stipe 2-3 ae : lamellae adnate. 
Pileus umbilicate, unicolorous. 22. M. praeiortipes. 
_ Pileus umbonate, slightly darker at the center. 3. M. Pea eee 
Stipe 5-8 cm. long; lamellae free; plant terrestrial. 4, M. glebigenus. 
aed of pileus pale-avellaneous or pale-isabelline, fading to white on 
rying. 
Stipe 1 cm. long. 25. M. graminis. 
Stipe 4 cm. long. 26. M. subrotula. 
Surface of pileus ochraceous, darker on the disk; pileus 2-4 mm. broad: 
stipe blackish, 1 cm. long. 29. M. Crescentiae. 
* The entire treatment of the temperate species of Marasmius here includ i 
* TE p ed, togeth h 
description of the genus, has been contributed by LeicH H PRNnINGTON. psa 
