40 AGARICUS. 



THcholoma. cent. (3-5 in.) long, 12 mm. (Yz in.) thick, rufescent or becoming 

 fuscous, hollow, commonly ventricose (attenuated at both ends), 

 equal only when smaller, rufous-fibril lose, at the first viscid, and 

 naked at the apex. Gills emarginate and at the same time re- 

 markably decurrent with a tooth, crowded, light-yellow, spotted- 

 rufous when touched or with age. 



Odour of new meal, strong, rancid. Commonly growing in troops, and often 

 caespitose. Sometimes the. gills vary in colour pallid, nay whitish ; such forms 

 are often confounded with A. albobrunneus. Among varieties there is one to 

 be separately noted, thinner, with the pileus and the equal stem thin, the paler 

 pileus even and wrinkled-dotted only at the disc, and the gills whitish. 



In deciduous woods. Frequent. Sept.-Oct. 



Fries notes that it is commonly found in birch woods. Name flavus, light- 

 yellow, brunneiis, brown. From the brown pileus and yellow gills. Fr. Monogr. 

 i. p. 56. Hym. Eur. p. 51. Icon. t. 27. f. i. Berk. Out. p. 98. C. Hbk. n. 

 45. Illust. PL 58. S. Mycol. Scot. n. 41. Letell. t. 707. 



70. A. albobrunneus Pers. Pileus about 7.5 cent. (3 in.) broad, 

 beautiful brown, fleshy, but compact only at the disc, campanulate 

 then hemispherical, viscid, becoming even, but remarkably streaked 

 with innate fibrils, the thin margin, which is at first incurved, 

 often wrinkled-crenate ; flesh scissile, shining white. Stem 4-5 

 cent. (i%-2 in.) long, 2.5-4 cent. (i-iX i n> ) thick, solid, becoming 

 hollow only when old, firm, equal, at first sight smooth, when more 

 closely examined the surface fibrillose-evened, dry (not viscous), 

 rufescent, constantly white, however, at both ends and chiefly at 

 the apex where it is white mealy ; flesh compact, shining white. 

 Gills rounded-emarginate, not decurrent, scarcely crowded, very 

 broad, 6 mm. (3 lin.) and more, firm, at first shining white, soon, 

 however, becoming pale or rufescent. 



The pileus varies date-brown and umber. Very remarkable, scarcely allied 

 to A. Jlavobrunneus. Odour none ; taste mild. 



In woods. Frequent. Sept. -Nov. 



Spores 3x4 mk. W.G.S. Name albus, white ; brunneus, brown. From 

 the brown pileus and white gills. Pers. Syn. p. 293. Fr. Mo?iogr. i. p. 57. 

 Hym. Eur. p. 51. Berk. Out. p. 98. C. Hbk. n. 47. Illust. PL 197. S. 

 Mycol. Scot. n. 42. Viviani t. 32. Barl. t. 12. A. striatus Schceff. t. 38. 

 A. compactus Sow. t. 416. 



71. A. ustalis Fr. Pileus bay-brown-rufous, fleshy, not com- 

 pact, hemispherico-expanded, at first umbonate, soon plane and 

 obtuse, even, smooth, not streaked, slightly wrinkled-dotted only 

 at the disc ; flesh white, becoming red here and there when broken. 

 Stem 5-7.5 cent. (2-3 in.) long, about 12 mm. (}4 in.) thick, stuffed 

 then hollow, equal, somewhat rooted, dry, fibrillose, whitish or 



