16. P. tremulus Fr. Very small, thin, tenacious, glabrous, livid-gray or 
grayish brown; gills linear, subdistant, gray or grayish ; stem short, 
ascending, villose at the base. Among or attached to mosses. Rare. 
17. P. petaloides Fr. Rather thin, small, wedge-shaped or spathulate, 
tapering into the short tomentose stem, sometimes grayish pubescent 
toward the base, whitish to brownish ; gills crowded, linear, decurrent r 
whitish or yellowish; spores minute, globose. Decaying wood. 
18. P. spathulatus (var. of the last ? Fr.) Peck. Much like the last 
but more variable in color, and the spores are elliptical and larger. On 
the ground, often in tufts. E. 
Pileus at first resupinate (i. e. on its back , gills ufi), then refiexed ,. 
stemless ‘ gills radiating from an excentric point. Nos. 19-29. 
19. P. porrigens Fr. Rather thin, suborbicular, then prolonged, often 
longer than broad, pure white, glabrous, or tomentose near the base, 
margin sometimes lobed; gills narrow, thin, linear, crowded, some¬ 
times forked or anastomosing at the base. Decayed pine and hemlock 
w r ood. Common. 
20. P. p insitus Fr. Fleshy, soft, hygrophanous, sessile, silky-villous, 
wavy, sordid when wet, pure white when dry; gills broad, distinct. 
Spores sordid. Tree trunks, rare. 
21. P. nidulans (Pers.) Fr. Not large, sessile, or rarely with a nar¬ 
rowed base, tomentose, hairy toward the margin, yellow or buff, margin 
at first involute; gills rather broad, not close, orange-yellow r ; spores a 
delicate pink. By some placed under Claudopus because of the color of 
the spores. A striking plant, not uncommon on decaying wood. 
22. P. septicus Fr. White throughout, very small, thin, pubescent 
or powdery, sessile or nearly so; gills rather broad, subdistant. Decay¬ 
ing wood. 
23. P. mastrucatus Fr. Viscid, fleshy, upper stratum gelatinous, 
imbricated, sessile, lobed, scaly, mouse-gray, rough, somewhat hairy ; 
gills broad, rather distant, whitish gray. Fallen trunks in woods. Rare. 
24. P. atrocaeruleus Fr. Viscid, fleshy, upper stratum gelatinous,, 
variously shaped, rather tough, imbricated, sessile, villose-tomentose, 
dark blue, blackish, or brownish ; gills rather broad, whitish or yellow¬ 
ish. Decaying trunks of poplar, beech etc. Rare. 
25. P. algidus Fr. Viscid, fleshy, small, cuticle thin, glabrous,.reddish 
brown or ashen ; gills rather broad, close, yellowish. Rotten w’ood. 
26. P. atropellitus Peck. Very small and thin, rather tough and 
flaccid, villose-tomentose, except on the margin, sessile or with a short 
grayish tomentose stem, blackish brown or black; gills rather broad, 
close, blackish brown or black, whitish on the edge. Decaying v r ood and 
bark; closely related to the next. 
27. P. applicatus Batsch. Very small (3 in.), dark cinereous, submem. 
branaceous, rather firm, villose at the base, sessile, or with a prolonga¬ 
tion at the back, cupular ; gills distant, paler than the pileus. Color 
variable. On rotten w r ood. 
28. P. ttiger Schw. Very small, submembranaceous, somewhat re- 
supinate, powdery, plicate on the margin, attached by a tuft of black 
hairs; gills broad, radiating, black, cinereous on the edge. Much like 
the next. Rare. 
29. P. striatulus Fr. Very small, membranous, delicate, sometimes 
obconic and pendulous, sessile, slightly striate when moist, strongly so 
when dry, flaccid, glabrous, persistent, cinereous or brown; gills few, 
distant, wdiitish or cinereous. Decayed pine and hemlock. 
