Mycena 
pileus conic, 2 cm, fuscous, fibriilose sulcate, slightly um- 
umbo ; 
bonate, flesh white, thin except under gills free, white ventricose 
I crowded; stine cartilaginous, solid, white within, fibrillose sul- 
jcate, white or _j_)ale gray witnout, <5 cm x 2 «o mm 
On decaying log, 
SX)ecimens examined : 
Costa Rica, San Jose, Rancho Redondo, Dodge & Thomas 50118 
