>0 THE AGARICACEAE OF MICHIGAN 



to identify to the species, and a microscope is essential to any final 

 decision. 



Key to the Species 



(a) Pileus and stem lavender to violaceous. 630. N. caelestina var. 



violacea Kauff. 

 (aa) Pileus and stem some other color. 



' (b) Spores quadrate or cruciate-four-angled; pileus umber or smoky- 

 umber. 623. A T . pascua Fr. 

 (bb) Spores not distinctly four-angled. 



' (c) Pileus with greenish tint, fuscous-brownish, livid or smoky, 

 very shining. 624. N. versatilis Fr. 

 (cc) Pileus without greenish or olivaceous tints, 

 (d) Stem and pileus hairy, fibrillose-scaly or flocculose; gills 

 subdistant. 

 (e) Spores 14-20x8-9 niicr.; whole plant smoky-brown. 622. 



N. clysthales (Pk.) Atk. 

 (ee) Spores subglobose, 8-9 micr.; pileus small, covered with 

 loose brown fibrils. 625. N. babingtonia Berk, 

 (dd) Stem and pileus glabrous, silky and shining, 

 (e) Gills white or whitish at first; pileus hygrophanous. 

 (f) Pileus conical, cinnamon-brown then pale and shining; 



gills narrow. 628. N. conica Pk. 

 (ff) Pileus campanulate, grayish-brown; gills medium broad. 

 629. N. fuscogrisella Pk. 

 (ee) Gills grayish at first; odor somewhat rancid-farinaceous. 

 626. N. mammosa Fr. 627. N. papillata Bres. 



*Gills at first gray, brown or fuscous. 

 622. Nolanea dysthales (Pk.) Atk. 



N. Y. State Mns. Report. 32, 1879 (as Entoloma clysthales). 

 •Tour, of Mycol., Vol. 8, p. 114, 1902 (as Nolanea nodospora Atk.). 



PILEUS 6-18 nun. broad, rarely larger, thin, campauulate-couvex, 

 obtuse, densely floccose-hairy, sometimes furfuraceous and striate, 

 more often even, the hairy tufts sometimes squarrose, smoky-umber 

 or dark fuscous, margin at first straight. FLESH submembranous. 

 ''■ILLS adnate, ascending, broad, ventricose, subdistant to distant, 

 thickish, dark fuscous-gray or smoky, tinged flesh color at maturity, 

 edge flocculose. STEM 14 cm. long, 1.5-4 mm. thick, equal, more 

 or less densely floccosc-totncntosc, dark fuscous or seal-brown, be- 

 coming smoky, toughish-cartilaginous, stuffed then hollow, con- 

 olor within. SPORES large, variable, elongated tuberculate-angu- 

 lar, I ! 20 x 8-9 micr., deep flesh color in mass, faintly colored under 

 tlie microscope. CYSTIDIA only on edge of gills, variable, some- 

 times elliptical to ventricose and obtuse, sometimes ventricose- 

 lanceolate and pointed, 60-70x20-25 micr. ODOR and TASTE 

 mild. 



