60 AGARICUS. 



Tricholoma. habit which is that of Clitocybe, by their elastic stem, and by the pileus not 

 being moist even in rainy -weather, a feature which constitutes a departure 

 from the spongy Tricholomata, as well as by their -white colour. 



In woods. Frequent. Sept.-Nov. 



Care should be taken not to confound it with various edible species of the 

 same colour. From its acrid taste, which easily distinguishes it, it is perhaps 

 poisonous. Spores 3x6 mk. W.G.S. ; 5-6x2-3 mk. B. Name albus, 

 white. Schce/. t. 256 (a thin form). Fr. Monogr. i. p. 91. Hym. Eur. p. 70. 

 Icon. t. 43. /. i. Berk. Out. p. 105. t. 4. /. 6. C. Hbk. n. 74. Illust. PI. 

 65. S. Mycol. Scot. n. 69. A. leucocephalus Bull. t. 536. Battar. t. 20. /. i. 



113. A. leucocephalus Fr. Wholly white without any yellow- 

 ish tinge. Pileus 4 cent. (\y 2 in.) broad, fleshy, thin, tough, con- 

 vexo-plane, obtuse, even, moist, smooth in itself, but when young 

 covered with shining whitish, adpressed, silky, at length separating 

 "uillous down; margin acute, spreading, smooth ; flesh compact, 

 watery in wet weather. Stem scarcely 5 cent. (2 in.) long, 6 mm. 

 (3 lin.) thick, hollow, fleshy fibrous, but polished externally, some- 

 what cartilaginous, rooting at the attenuated solid base, twisted, 

 even, smooth. Gills rounded-free, crowded, thin, quite entire, 

 shining white. 



Strong odour of new meal. Plainly different from A. albus, allied to A. 

 (Armill.) constrictus, but from its somewhat cartilaginous stem inclining to 

 Colly bi<z, just as A. albus does to Clitocybcs. 



In woods among leaves. Bowood, Wilts. Oct. 



Name Aev/cds, white, Ke^oAyj, head. Fr. Monogr. i. p. 92. Hym. Eur. p. 

 71. Icon. t. 43. /. 2, not Krombh. B. & Br. n. 1505. C. Illust. PL 78. 



** Gills changing colour. 



114. A. acerbus Bull. Pileus becoming yellow-white, pale- 

 yellowish, then smeared with rufous or fuscous colour, fleshy, 

 convexo-expanded, smooth, moist, somewhat tiger-spotted, the 

 thin margin wrinkled-sulcate. Stem solid, obese, becoming light- 

 yellow, squamulose at the apex. Gills emarginate, crowded, 

 pallid then rufescent. 



Large, robust, with an unpleasant odour and bitter taste. The stem is com- 

 monly bulbous, but sometimes attenuated at the base. 



In shady woods. Frequent. Aug.-Sept. 



Margin of pileus involute. Flesh firm, snow-white. Stem squamulose or 

 roughened with small warts at the apex. Bull. Pileus 7.5-10 cent. (3-4 in.) 

 broad. M.J.B. Spores 4 mk. W.G.S. Name acerbzis, bitter. From the 

 taste. Bull. t. 571.7. 2. Fr. Hym. Eur. p. 71. Berk. Out. p. 105. C. Hbk. 

 n. 75. Illust. PL 76. S. Mycol. Scot. n. 70. Saund. & Sm. t. 48. /. 2. 

 Ventur. t. 38. /. 7, 8. 



