786 THE AGARICACEAE OF MICHIGAN 



seem to be closely related to other Mycenas, and its position here 

 is uncertain. It belongs more nearly to Heliomyces. 



834. Mycena vulgaris Fr. 



Syst. Myc, 1821. 



Illustrations: Cooke, 111., PI. 191. 

 Berkeley, Outlines, PL 6, Fig. 4. 

 Atkinson, Mushrooms, Fig. 9, p. 97, 1900. 



PILEUS 5-15 mm. broad, convex to subexpanded, subviscid when 

 moist, pale grayish-brown to fuscous, umbilicate, striatulate to um- 

 bilicus, somewhat darker in center, soft, fragile, sometimes papillate 

 on center. FLESH membranaceous, subhygrophanous. GILLS 

 broad behind and subdecurrent, subdistant, thin but sometimes 

 thickish, often venose, white then grayish-white. STEM 2-5 cm. 

 long, 1-1.5 mm. thick, cartilaginous, toughish, hollow, glabrous, 

 somewhat rooting, very viscid when moist, straight or flexuous, 

 equal, even, pallid brownish or grayish. SPORES broadly ellip- 

 tical, 6-8x4-5 micr., smooth, white. CYSTIDIA and STERILE 

 CELLS none or few. BASIDIA slender, 30 x 5 micr., clavate. 

 ODOR and TASTE none. 



Caespilose or gregarious. Attached to pine needles, leaves and 

 sticks in conifer or frondose woods, so far only in the coniferous re- 

 gions of the State. New Richmond, Marquette. August-Septem- 

 ber. 



Mycena vulgaris, except for its viscidity, would be looked for 

 under the genus Omphalia. Fries describes the pileus as "de- 

 pressed," but it usually has the umbilicate character in our plants; 

 and is practically an Omphalia with broad, subdecurrent gills. 

 Authors differ widely as to size of spores. Massee and Karsten 

 (Stevenson's British Fungi) give the measurements very small, 

 4-5 x 2 micr., while Schroeter says they are 9-11 micr. long. This 

 discrepancy shows that these authors were dealing with different 

 species. American authors do not give any spore measurements. 

 AVhen young and moist the pileus is quite viscid, but soon dries. 

 The species is often very abundant under favorable weather condi- 

 tions in the localities where it occurs. 



