818 THE AGARICACEAE OF MICHIGAN 



875. Omphalia epichysium Fr. 



Syst. Myc, 1821. 



Illustrations: Atkinson, Fig. 101, p. 101, 1000. 

 Plate CLXXI of this Report. 



PILEUS 1-4 cm. broad, convex then expanded and umbilicate 

 or umbilicate-infundibuliform, margin arcuate with decurved edge, 

 striatulate and dark cinereous to smoky -brown (moist), even, silky 

 and light gray to whitish (dry). FLESH thin, soft. GILLS 

 acuminate-subdecurrent, ascending-arcuate, narrow, close, thin, 

 whitish-cinereous, edge entire. STEM 1.5-3 cm. long, 1-3 mm. thick, 

 equal, glabrous, almost solid or subfistulose, smoky-cinereous, con- 

 color within. SPORES 7.5 x 1 micr., pip-shaped, smooth, white. 

 CYSTIDIA none. 



On decaying logs or remains of decayed wood in frondose or 

 mixed woods. Throughout the State. Ann Arbor, New Richmond, 

 Marquette and Houghton. July-September. Infrequent. 



The pileus is often flbrillose-floccose on the umbilicate center. 

 The plants are rather soft and watery and the stem soon shrivels. 

 O. onisca Fr. differs in the hygrophanous pileus which is entirely 

 glabrous, the smaller size and large spores; the gills are somewhat 

 different in shape and spacing. 



876. Omphalia onisca Fr. 



Syst. Myc, 1821. 



Illustrations: Fries, Icones, PI. 75, Fig. 3. 

 Cooke, 111., PI. 209. 



PILEUS 5-15 mm. broad, convex, soon plane and cyathiform- 

 umbilicate, glabrous, flaccid, hygrophanous, smoky-fuscous or ashy- 

 brown and striate on margin (moist), pale cinereous and hoary 

 (dry), the umbilicus darker. FLESH thin, concolor when moist, 

 pale grayish-white when dry. GILLS short, dccurrent, broadish 

 in middle, subdistant, thickish, cinereous-fuscous, sometimes forked, 

 edge entire. STEM short, 1-1.5 cm. long, .5-1 mm. thick, slender, 

 equal, toughish, firm, solid, concolor, glabrous, becoming pale 

 within. SPORES 9-11x5 micr., distinctly ovate, apiculus curved, 

 smooth, white. CYSTIDIA and sterile cells none. BASIDIA 



