CLASSIFICATION OP AOARK 



(aa) Not densely caespitose; solitary nr gregarl 

 iii) Spores 7-9 micr. long; pileue amber. 269 P. obtuiata Fr. 

 (bin Si)ores 10-12 micr. long; plleus rufous-brown. 260. P. 

 simplex ltritz. 



Section I. Conopilae. (Incl. of Obtusatae Fr.) Surface of 

 pileus glabrous; stem polished and shining. 



258. Psathyra umbonata Pk. 



N. V. State .Mns. Rep. 50, 1897. 



Illustrations: Plates LV, LV I of this Report. 



PILEUS 2-5 cm. broad a1 maturity, 2-3 cm. bigh, subcylindrical 

 mi the very first, then conico-campanulate, a1 length Btronglj and 

 obtusely umbonate, hygrophanous, dark bay-brown to purplish- 

 brown mid striatulate (moist), grayish-white, even and atomate 

 (dry), sometimes faintly rugulose when dry. FLESH thin, eon 

 color. (SILLS ascending, adnaU seceding, rather broad, 3 I nun., 

 narrowed in front, close, becoming dark purplish brown, finally al- 

 most black, edge white-fimbriate. STEM 5-10 cm. long, 2-3 nun. 

 thick, slender, flexuous, rigid-fragile, equal, hollow, sometimes 

 twisted, 8hining-whiU becoming pallid. SP< IRES 13 L5.5 s 7 8 micr., 

 elliptical, obtuse, smooth, dark purplish under the microscope, 

 black in mass. CYSTIDIA none on sides of gills; sterile cells on 

 edge, cysi idia like, ventricose, apes obtuse. BASIDIA L-spored, 

 narrowly stalked, inflated above. 



Caespitose or gregarious-subcaespitose, on decayed w I. usually 



stumps and Logs. June-September. Ann Arbor, New Richmond. 

 Not infrequent. 



Forming Large clusters of many individuals, often al il nd of 



old moist logs, lis long slender Btems ami cone-shaped caps 

 distinguish it at once from Qypholoma clusters. Someti s only 



a few individuals occur in one place. It has the stature and general 



appearance of P. conopilea Fr., as shown in the published i > lt ' i • 

 but differs in the truly adnate .uills and the striate margin of the 

 moist cap. Peek compares it with P. corrugis Fr. i r> » Another 

 species sometimes occurs, which differs from the preceding mainly 

 in the size of its spores : 15-18x7-8 mier. This differs from /'. ( l-if<i 

 Mass.. in the margin being long-striate, The size, Bhape and col 

 are the same as in /'. umbonata. Because of its almost black 

 it might be mistaken for Psathyrella subatrata, but that - 



does not grOW <>u wood. 



