254 NORTH AMERICAN FLORA 
Piteus small, 3 mm. or less broad. 
Plant minute, pubescent. 
Plant not pubescent. 
Pileus smoky-brown, smooth. 
Pileus pale-straw-colored, striate. 
Piteus more than 3 mm. broad. 
Stipe beset with white or tawny hairs. 
Stipe not beset with hairs. 
Stipe brown or blackish. | ' 
Pileus becoming darker in dried plants. 
Pileus becoming paler in dried plants. 
Stipe smooth. 
Stipe tomentose. 
Stipe neither brown nor blackish. 
Stipe glabrous; pileus reddish-brown. 
Stipe farinaceous or subtomentose. 
Pileus white with a reddish disk. 
Stipe contracted to a point below. 
Stipe not contracted to a point below. 
Pileus rufescent. 
Pileus pale-yellowish-brown then whitish, pli- 
cate-striate. 
Pileus usually membranous; stipe smooth and shining except in a few 
small plants with a pileus less than 5 mm. broad. 
Plants small; pileus usually less than 3 mm. broad. 
Pileus white. 
Pileus 1-2 mm. broad, smooth. 
Pileus small, less than 1 mm., hairy under a lens. 
Pileus not white. 
Stipe pale-straw-colored. 
Stipe neither yellow nor straw-colored. 
Stipe blackish-brown, shining. 
Stipe pallid, brownish below. 
Cystidia present. 
Cystidia absent. 
Stipe white. 
Plants larger; pileus usually over 3 mm. broad. 
Pileus fleshy or subfleshy, membranous only in large plants. 
Plants with odor of onions. 
Plants without odor of onions. 
Pileus white or light-yellow. 
Stipe brown, mycelioid; cystidia present. 
Stipe reddish-brown, not mycelioid; cystidia absent. 
Pileus neither white nor light-yellow. 
Plants densely cespitose. 
Fastern plants. 
Western plants. 
Plants not densely cespitose. 
Cystidia present; lamellae broad. 
Cystidia absent. 
Pileus pale-pink or purplish. 
Pileus vinous-red or bay-brown. 
Pileus membranous. 
Pileus white. 
Lamellae attached to a free collar. 
Lamellae not attached to a free collar. 
Stipe black, paler at the apex. 
Stipe pale-straw-colored. 
Pileus not white. 
Lamellae attached to a free collar. 
Pileus alutaceous to umber, umbilicate. 
Pileus reddish-white, umbonate. 
J,ameliae not attached to a free collar. 
Pileus ochraceous, ochraceous-red, or brown. 
Cystidia present. 
Cystidia absent. 
Pileus not colored as above. 
Lamellae purplish-gray. 
Lamellae not purplish-gray. 
Pileus campanulate; maroon or vinous-red. 
Pileus convex to plane or depressed. 
Pileus red-brown or vinous-red. 
Pileus fuscous, pinkish, or rarely whitish. 
1. Marasmius Peckii Murrill, sp. nov. 
[VoLUME 9 
. M. minutissimus. 
. M. concinnus. 
. M. cucullatus. 
. M. elongatipes. 
. M. felix. 
. M. badiceps. 
. M, insititius. 
. M. leptopus. 
. M. praeacutus. 
. M. ramealis. 
. M, Olneit. 
. M, insititius. 
. M, filopes. 
. M. minutissimus. 
. M. cucullatus. 
. M. minutus. 
. M. pirinus. 
. M. thujinus. 
. M. concinnus. 
. M. alliatus. 
. M. delectans. 
. M. calopus. 
. M, fasciatus. 
. M. washingtonensis. 
. M, glabellus. 
. M. bellipes. 
. M, plicatulus., 
. M. rotula. 
. M., albiceps. 
. M. straminipes. 
. M. capillaris. 
. M. graminum. 
. M. glabellus. 
. M. stccus. 
. Mf. melanopus, 
. M. pulcherripes. 
. M. minutus. 
. M. androsaceus. 
Pileus minute, hemispheric, not expanding, umbilicate, gregarious, reaching 2 mm. broad; 
surface radiate-sulcate, finely rugose, glabrous, whitish or gray, blackish and papillate at the 
