771 THE AGARICACEAE OF MICHIGAN 



Schroeter (Die Pilze Schliesiens, p. 645) describes a small yellow- 

 ish sclerotium from which the stem arises, and which he says forms 

 abundantly between the gills of decaying fungi, especially Eijpho- 

 loma fasciculare. Berkeley also notes that it is "often attached 

 to a little, yellowish, nodular schlerotium." Stevenson remarks 

 that "it never has a radical tuber." Fries, Gillet and others do 

 not mention a sclerotium; I have not observed any. Most authors 

 agree that it occurs on decaying mushrooms, as well as humus, etc. 

 It differs from C. tuberosa in its umbilicate pileus. 



825. Collybia hariolorum Fr. (Edible) 



Svst. Mvc, 1821. 



Illustrations: Cooke, 111., PL 150. 



(Jillet, Champignons de France, No. 159. 



PILEUS 2-5 cm. broad, broadly convex-expanded, thin, flexible, 

 becoming soft and flabby in moist weather, even, glabrous, whitish 

 with a rufescent disk or altogether rufous-tinged, often fading to 

 pallid-whitish ; flesh thin, white, soft. GILLS adnexed or almost 

 free, very narrow, crowded, hollow, thickish, edge entire, collapsing. 

 STEM 2-5 cm. long, 2-3 mm. thick, equal or tapering slightly up- 

 ward, pallid or tinged rufescent, covered by a white tomentum 

 which is thinner towards apex, hollow, elastic, cartilaginous, be- 

 coming soft when wet. SPORES small, 0-7.5x3 micr., narrowly 

 oblong-ovate, smooth, white. CYSTIDIA none. ODOR strong and 

 somewhat disagreeable when plants are crushed. 



Gregarious, often scattered, sometimes caespitose. Among fallen 

 leaves in frondose woods, probably throughout the State. August- 

 September. Rather frequent. 



This Collybia may be known by its soft and somewhat collapsible 

 texture, the white tomentosity of the stem, and the pale rufous- 

 white or whitish cap. It has somewhat the appearance of C. con- 

 fluens to which it seems related, but as a rule it has a shorter stem, 

 and in wet weather, instead of reviving becomes soft and fragile. 

 The figure of Cooke illustrates our plant fairly well. The rufous 

 tinge of the pileus is apparently more characteristic of American 

 than of European plants. 



