104 SECTION HYGROTRAMA 



wet "snuff brown," "light pinkish cinnamon," or "tawny olive," fading 

 to "clay color" or "pinkish buff," slowly darker and grayer, sometimes 

 faded specimens "drab" or "olive brown" and atomate, finally becoming 

 "mummy brown," often the margin crenate or lobed. Context thick on 

 the disc, thin elsewhere, waxy, pallid or concolorous with the surface; 

 odor and taste none. 



Lamellae broadly adnate, becoming decurrent, concolorous with 

 the pileus when young, nearly so in age or "hair brown," subdistant to 

 distant, broad, edges pallid and even. 



Stipe 2-8 cm long, 2-7 mm thick, concolorous with the pileus, dark- 

 ening in age, finally becoming "mummy brown," equal or tapering 



Fig. 25. 



H. hymenocephalus 



downward, fragile, terete or compressed, the apex canescent at first, 

 elsewhere glabrous, solid becoming hollow. 



Spores 4-6 X 4-5 /*, globose to subglobose, at times short-ellipsoid, 

 often more or less flat-sided, smooth, pale yellowish in Melzer's rea- 

 gent. Basidia 34-50(64) X 5-8 /x, 2- and 4-spored. Pleurocystidia and 

 cheilocystidia not differentiated. Gill trama of interwoven hyphae 

 4-10(16) fx broad, the hymenium appearing as a blackish line in sec- 

 tions of old material. Pileus with an epicutis of an irregular palisade of 

 inflated cells (30)40-85 X (10)14-22(30) /*— an epithelium. Pileus 

 trama of subparallel hyphae, radially disposed. No clamp connections. 



Habit, Habitat, and Distbibution — Gregarious to scattered on 



