6g6 THE AGARICACEAE OF MICHIGAN 



721. Tricholoma resplendens Fr. (Edible) 



Hymen. Europ., 1874. 



Illustrations: Fries, Icones, PI. 29. 



Hard, Mushrooms, Fig. 504, p. GOO, 1908. 



Cooke, 111., PI. 55. 



Uillet, Champignons de France, 695. 



PILEUS 4-10 em. broad, 'convex-plane, viscid, glabrous, white, 

 shining when dry, even, margin naked and at first straight. FLESH 

 white, rather soft, thin on margin. GILLS narrowly adnexed, 

 emarginate, close, medium broad, ventricose, scarcely thickish, 

 white, sometimes intervenose, edge entire. STEM 4-8 cm. long, 7-15 

 mm. thick, subequal or tapering downward, often subbulbous at 

 base, solid, rarely with tubule or cavernous, glabrous, dry, even, 

 white. SPORES 6-7.5x4 micr.. short elliptical, smooth, white. 

 CYSTIDIA and sterile cells none. ODOR and TASTE mild. 



Gregarious or scattered. On the ground, in conifer or frondose 

 woods. September-November (earliest record August 9). Mar- 

 quette, Bay View, New Richmond, Detroit. Common in the vicinity 

 of Ann Arbor. 



The viscid pileus distinguishes this from other white Tricholomas 

 of this size which have a mild taste and odor. Slender forms imi- 

 tate Hygrophorus eherneus, but that has a glutinous or viscid stem. 

 Stout forms approach Hygrophorus sordidus Pk. which, however, 

 has more distant gills, a stouter stem and waxy decurrent gills. 

 When dry, it imitates Tricholoma columhctta, but the pileus of the 

 latter is said to become silky-fibrillose and the margin is at first 

 involute and subsquamulose. The pileus is sometimes yellowish or 

 hyaline-spotted on the disk. The stem tends to be variously curved 

 toward base. The plant varies considerably and several forms have 

 been found. (A) Pileus conical-ovate when young, then expanded 

 and subacutely umbonate; stem fibrillose striate. Entirely white. 

 In woods of white pine, beech, etc., at New Richmond. (B) Stem 

 blue-spotted toward base, with a narrow tubule. Entirely white 

 elsewhere, stature smaller than type. After frosts in the late fall. 

 In oak, etc., woods, at Ann Arbor. This would seem to correspond 

 to the blue-spotted form of T. columhctta mentioned by various 

 authors; in our plant the pileus was distinctly viscid, and the stem 

 dry. They grew under the fallen leaves during November. The 

 spores of both these forms were typical. 



