CLASSIFICATION OF AGARICS 179 



504. Hebeloma albidulum Pk. 

 \. V. State Mus. Rep. 54, L901. 



PILEUS 3-6 cm. broad, convex expanded, obtuse, glabrous, viscid 

 (moist), dingy-white, buff, or tinged ochraceous or grayish, even. 

 FLESH white, thick on disk. (JILLS adnexed, emarginate, narrow, 

 crowded, whitish then isabelline to pale rnsty-brownish, minutely 

 while -fimbriate on edge. STEM •". -9 cm. long. I -10 mm. thick, equal 

 or Bubbulbous at base, glabrous and innately silky shining , Btuffed 

 then hollow, white, pruinose at apex. SPORES elliptical, in- 

 equilateral, 10-12.5x5-7 micr., pale-brownish under the micron-ope. 

 Bmooth. CYSTIDIA rather abundanl on sides and edge of gills. 

 cylindrical, slender, obtuse, about 75x5-6 micr. Odor none: taste 

 mild. 



(Dried: Pileus rufous-brown to tan; gills rusty-brown; stem 

 pallid to dingy white.) 



( Jregaiioiis to suheaespitose. On the ground, mixed or frondose 

 woods. Ann Arbor, New Richmond.- September-October. Infre- 

 quent. 



Definitely known by its peculiar cylindrical cystidia ; its dingy 

 white or ochraceous bull' pileus, white stem and narrow gills also 

 help to place it. It is related to II. album Pk. which has larger 

 spores, measuring 12-16 x 6-8 micr., and a more persistent white 

 pileus and stem. Both II. albidulum and II . album can be easily dis- 

 tinguished from H. sarcophyllum which is also a pure white species, 

 by the pink gills of the bitter. H. neurophyllum Atk. may also be 

 contused with it. Some of our specimens had a rather abrupt, 

 oblique and marginate bulb, in this respect approaching Cortinarii, 

 but fresh young specimens lack the cortina. The gills and spores 

 have a peculiar shade of brown, showing their relation to //. sar- 

 cophyllum. 



505. Hebeloma simile sp. nov. 



PILEUS 2-6 cm. broad, convex-expanded, whitish tinged ochra- 

 ceous, subviscid (moist), lustre dull i dry >. glabrous, even. FLESH 

 thick on disk, white, (ilkks adnate at first, becoming emarginate, 

 rather broad, not crowded, yentricose, thin, whitisli then alutaceous, 



edge minutely (loCCOSe den t iciilale. not cost ate. STEM 3 8 cm. long, 



2-5 mm. thick, slender, equal, not bulbous, white, floccost to mealy 

 throughout, glabrescent, at length innately fibrillose-striatulate, 



