266 



THE AGARICACEAE OF MICHIGAN 



which has evanescent white-floccose scales sprinkled over it, and 

 in tke less roseate line of tke gills in the intermediate stage. It 

 kas tke size and skape of H. ineertum. Tke margin of cap does not 

 become violaceous-tinged in age. Fries says "caespitose" in habit, 

 and to that extent our plant is a variety. 



255. Hypholma hydrophilum Fr. (sense of Ricken) (Suspected) 



Epicrisis, 1836-38. (Hymen. Europ. as Bolbitius.) 

 Illustration: Ricken, Blatterpilze, PI. 64, Fig. 6. 



PILEUS 2-0 cm. broad, fragile, campanulate-convex, then ex- 

 panded, watery cinnamon-brown to chestnut-brown when moist, 

 hygrophanous, ochraceous-buff when dry, even or pellucid-substriate 

 on margin, often wavy, margined with a del irate, superficial, white, 

 silky border which represents the remains of the veil. FLESH thin, 

 concolor. GILLS adnate-seceding, thin, ventricose, not broad, 

 crowded, at first grayish-brown, then purplish-umber or dark brown, 

 edge minutely white-flmbriate when young. STEM I-G cm. long, 

 3-G mm. thick, equal, hollow, splitting, elastic, glabrous except the 

 pruinose apex, shining-white, undulate, base mycelioid. SPORES 

 5-6x2.5-3 micr., minute, smooth, pale purplish-brown under micro- 

 scope. CYSTIDIA few or none. STERILE CELLS on edge of 

 gills inflated-saccate, short, 30-8 micr. ODOR and TASTE none. 



Cacspitose in extensive clusters on -or near stumps and decayed 

 wood, or at base of living trees. Ann Arbor, New Richmond. I prob- 

 ably throughout the State). 



September-November. Not infrequent* 



Fries says it distills drops of moisture along the edge of the 

 gills, but this is rare in our climate, although it does occur. It is 

 a very fragile plant, with a white stem and a watery-brown cap 

 which fades quickly in the wind as the moisture escapes. Its 

 minute spores distinguish it. although European authors are not 

 agreed on the spore size. Ricken and Massee give them as above. 

 Saccardo seems to be in error, or there may be two closely allied 

 plants as with us. We have another species, which is almost like 

 it. 



256. Hypholoma hydrophilum Fr. (sense of Saccardo) 



This differs from the preceding as follows: PILEUS at first 

 sprinkled over its surface with white, floccose particles or minute 



