766 



THE AGARICACEAE OF MICHIGAN 



Section III. Striaepedes. Putrescent; not hygrophanous ; stem 

 conspicuously striate, glabrous. 



815. Collybia radicata Fr. (Edible) 



Syst. Myc, 1821. 



Illustrations: Hard, Mushrooms, Fig. 78, p. 107, 1908. 



Mcllvaine, One Thousand Amer. Mushrooms, PL 29, op. p. 



112, 1900. 

 White, Conn. State Geol. and Nat. Hist. Surv., Bull. No. 3, 



PL 6, op. p. 27, 1905. 

 Cooke, 111., PL 110. 



Gillet, Champignons de France, No. 165. 

 Peck, N. Y. State Mus. Mem. 4, PL 18, 1900. 

 Plate CLXVII of this Report. 



PILEUS 3-10 cm. broad, convex to nearly plane, sometimes uin- 

 bonate, viscid, glabrous, grayish-brown to smoky-brown or umber, 

 sometimes nearly white, even. or rugose. FLESH rather thin, white. 

 GILLS adnewcd, broad, thick, subdistant, white. STEM elongated. 

 5-20 cm. long above the surface of the ground, with a long root- 

 like prolongation penetrating the earth, tapering upward, 4-8 mm. 

 thick, rigid-erect, glabrous, tic isted- striate to sulcate, white above, 

 usually brownish or smoky-brownish elsewhere, cartilaginous. 

 SPORES broadly elliptical, smooth, 14-17 x 9-11 micr. CYSTIDIA 

 scattered, on edge and sides of gills, 00-80 x 15-18 micr. ODOR and 

 TASTE mild. 



Gregarious or solitary. On the ground in woods, groves, clear- 

 ings, etc., throughout the State. June-October. (Earliest record 

 June 2G, latest October 4.) Common. 



The "rooted Collybia'' is closely related to G. longipes, whose stem 

 has a similar root-like prolongation at the base. The viscidity of the 

 pileus is almost absent in dry weather. The stem is usually thick- 

 ened just above the "root," and as Atkinson has pointed out, this 

 "root" is sometimes attached to dead tree roots deep in the soil. 

 They often grow from much decayed stumps or logs, especially in 

 recent clearings. The clear white of the gills is quite marked. 

 It is one of the first summer mushrooms with which the beginner 

 becomes acquainted, and the great variation in color and size will 

 often mislead him into thinking he has several kinds, especially if 

 he collects without getting the "root." Peek has named two varie- 



