254 THE AGARICACEAE OF MICHIGAN 



brown under microscope, almost black iu mass. OYSTIDIA on 

 sides and edge of gills, clavate or snbventricose on a slender stalk, 

 obtuse at apex, 40-60 x 10-14 inicr., abundant on edge. BASIDIA 

 25-35x7-9 micr., 4-spored. ODOK and TASTE mild. 



Parasitic, from one to seven on the host; on Coprinus atramenta- 

 rius and Coprinus comatus. 



Ann Arbor, Detroit, Port Huron. September-November. Infre- 

 quent. 



This curious Agaric, like Nyctalis asterophora and the European 

 Volvaria loveiana, seems to have no other home than on the founda- 

 tion furnished by some species of another Agaric. Rumors have 

 come to me that it occurs also on C. micaceous, but no specimens 

 have been seen. It is distributed over northeastern North America, 

 having been seen in tbe states of New York, Michigan, Wisconsin, 

 Minnesota and by Dr. Pennington in Canada as far west as Winni- 

 peg. It is a good Stropharia, although at first referred by Peck to 

 Panoeolus with a suggestion that it might be put under Hypholoma. 

 As Atkinson has shown (Plant World), the nature of the veil and 

 annulus and the purple tinge to the spores are Stropharia char- 

 acters. The host mushrooms are deformed and may not de- 

 velop sufficiently to be recognized. Excellent specimens were re- 

 ceived from Mr. A. W. Goodwin of Port Huron. Harper has pointed 

 out (Mycologia, Vol. 5, p. 167) that the figures of an European 

 species, Pilosace algeriensis Ft., by Lanzi (Fung. Mang., PI. 67, 

 Fig. 3) may represent our plant. An examination of these figures 

 has convinced me that there is a probability that they illustrate 

 our species. It remains very doubtful, however, whether Lanzi's 

 plant when fresh had free gills. In any ease, our plant is not a 

 Pilosace, although collectors may disagree as to whether it is a 

 Stropharia or a Hypholoma. 



Hypholoma Fr. 



(From the Greek, hypha, a web, and loma, a fringe; referring to 

 the fringe left hj veil on margin of pileus.) 



Purple-brown-spored. Stem fleshy, confluent with the pileus ; gills 

 adnate-seceding. Veil breaking away from the stem, leaving shreds 

 or a silk)/ border on the margin of the pileus, flocculose-fibrillose. 

 Margin of pileus at first incurved. 



Putrescent fungi, growing on decaying wood or on the ground, 

 often very caespitose around stumps or decayed roots of trees. The 



