74 THE AGARICACEAE OF MICHIGAN 



according to the description, by its glabrous stem and the spores 

 which measure 7-9x3-4 inicr. 



45. Marasmius caricicola Kauff. 

 N. A. F., Vol. IX, p. 277, 1915. 



PILEUS 4-8 mm. broad, convex-expanded, obtuse, radiately and 

 broadly sulcate or alveolate, pure white, toughish, pliant, reviving. 

 pruinose. FLESH very thin, membranaceus. GILLS adnate, thick, 

 very distant, rather broad, pure white. STEM very short, about 

 2 mm. long, 0-7 mm. thick, terete, equal, central, subglabrous, pure 

 white, horizontal or ascending, inserted by a miked base. SPORES 

 elliptical-ovate, narrowed toward apiculus, obtusely rounded at op- 

 posite end, 15-18x0-0.5 micr. when mature, smooth, white. BASIDIA 

 2 or 4-spored, about 45x7 micr., elongated-clavate. STERIGMATA 

 stout, awl-shaped, 7-8 micr. long. ODOR none. 



Gregarious, on lower portion of Carex stems, in marshes, willow 

 swamps, etc. Ann Arbor. October-November. Common locally. 



Differs from M. candidus Fr. in the sense of all authors, in that 

 the pileus is not umbilicate nor hemispherical, in its naked, inserted 

 base of the stem, and probably in the spores. Quelet (Jura et. Vos- 

 ges) gives the spores of the same length for M. candidus. Cooke 

 (111.) gives minute spores, and Patouillard (Tab. Analyt.) figures 

 them fusiform for M. candidus. Hard's photograph (Mushrooms, 

 Fig. 107, p. 112, 1908) can scarcely be considered as the M. candidus 

 of Fries, whose plant is described as minute, but is apparently 1/. 

 magnisporus Murr. Manifestly, M. candidus Fr. is not well under- 

 stood. 



The trama of the pileus is composed of compact long, thickish. 

 hyaline hyphae, differentiated at the surface into globose, hyaline, 

 cells 0-7 micr. in diameter. 



SUBGENUS MYCEXA: Margin of pilots at first straight and 

 oppressed. Stem horny, tubular, sometimes stuffed, tough and dry. 

 Pileus submembranaceus. 



Section IV. Chordales. Stem radicating or attached by floccose- 

 radiating hairs. 



