578 THE AGARICACEAE OF MICHIGAN 



toughish, glabrous or very delicately flbrillose with purple fibrils 

 on a dark violet (/round. SPOKES tuberculate-angular, elongated, 

 10-12x6-7 micr. (occasionally wider), angles obtuse. CYSTIDIA 



none. 



Subcaespitose. On sawdust, rotten wood, etc. Bay View. July- 

 August. Rare. 



'I'll is beautiful little plant is a wood-inhabiting species like L. 

 placida but much more slender. The spores of our plants are longer 

 than the measurements given by the English mycologists and their 

 coarse obtuse angles make them somewhat unique. When old, the 

 translucent margin of the pileus shows the lines of the gills so 

 as to appear striate, a condition often found in other non-striate 

 species when old. 



Section II. Hygrophanae. Pileus hygrophanous, margin striate 

 when fresh and moist. 



621. Leptonia asprella Fr. 

 Syst. Mycol., 1821. 

 Illustration: Atkinson, Mushrooms, Fig. 139, p. 147, 1900. 



PILEUS 2-4 cm. broad, convex, becoming somewhat expanded, 

 umbilicate-depressed, glabrous or flbrillose, striatulate when moist, 

 umbilicus villose or scaly, hygrophanous, silky-shining when dry, 

 from pale umber to grayish-brown, variable in color, margin becom- 

 ing split. FLESH watery to whitish, thin, rather fragile. GILLS 

 adnexed to adnate seceding, subdista.nt, rather broad, narrowed in 

 front, whitish to grayish, then rosy from the spores, edge concolor, 

 entire. STEM 3-8 cm. long, 2-3 mm. thick, slender and usually 

 straight, rigid and elastic but fragile, glabrous, livid-fuscous to pale, 

 si ulred then hollow, sometimes twisted, white-mycelioid at base, apex 

 pruinose. SPOEES angular, angles sharp, 9-13x6-8 micr., broadly 

 elliptic-elongate in outline. CYSTIDIA none. ODOR and TASTE 

 mild. 



Solitary or gregarious. On the ground in woods. Bay View, 

 New Richmond, Ann Arbor. Infrequent. August-September. 



Tli is species varies considerably, and there seems to be no settled 

 notion ,.r its exact limitations. Cooke figures a plant quite different 

 in color and size from that of the above description. The striatums 

 are in, i always definitely present, especially in the dry plant. The 



