84 THE CHICAGO ACADEMY OF SCIENCES 



Lamellae adnate, close, pale-yellow becoming ferruginous. 



Stem slender, hollow, equal or tapering downwards, yellowish, 

 generally becoming brownish toward the t>ase. 



Pileus 2.5 to 5 cm. broad; stem 2.5 to 7.5 cm. long, 4 mm. 

 thick. Spores ellipsoid, dark ferruginous, 7.5 x 4 to 5 /x. 



Gregarious in a lawn. "Wheaton. In open woods. Glen 

 Ellyn. September and October. 



NAUCORIA. 



Veil none or fugacious, squamulose; stem cartilaginous, fistu- 

 lose or spongy-stuffed; pileus more or less fleshy, convex-plane or 

 conical, the margin at first inflexed; lamellae adnate or free, not 

 decurrent. Growing on the ground, somewhat rooted. Spores 

 ferruginous. 



Pileus not hygrophanous A r . semiorbicularis. 



Pileus hygrophanous N. vernalis. 



Naucoria semiorbicularis Fr. 



Pileus a little fleshy, hemispheric, expanded, even, glabrous, 



somewhat viscid, at length rivulose. 



Lamellae adnate, very broad, close, pallid then ferruginous. 



Stem slender, tough, almost straight, pale-ferruginous, shining, 

 with a free tubular pith. 



Pileus 2.5 to 5 cm. broad; stem 7.5 to 10 cm. long, 2 mm. 

 thick. 



Peaty ground in a partially drained slough, Palos Park. 

 May. Our plants are slightly viscid when young, becoming dry. 

 The color of the pileus in mature plants is ochraceous-tan, of the 

 stem whitish. Spores pyriform or ellipsoid, 11 to 13 x 6 to 8 p. 



Naucoria vernalis Pk. 



Pileus thin, fleshy, convex then a little depressed with a de- 

 flexed margin, umbonate, hygrophanous, dull-yellow, darker when 

 moist. 



Lamellae narrow, attached, cinnamon-color. 



Stem long, flexuous, striate-sulcate, hollow, tapering down- 

 ward, white-villous at the base, brownish. 



Pileus 'J to 3 cm. broad; stem 4 to 8 cm. high, 4 to 5 mm. 

 thick. Spores wood-brown. 



Growing out of holes in the bark of rotten logs of Quercus. 

 The plants are rooted in the rotten wood underneath the bark, 

 so that the pileus often appears nearly sessile on the surface of 

 the log. Often cespitose. Our plants are only occasionally 

 umbonate. The stem is striate beneath a mealy coating. Taste 

 farinaceous then bitter. Spores pale-brown, ellipsoidal, inequilat- 

 eral, often with one side flat, 7 to 8 x 5 /x. After rains, spring to 

 autumn. 



