156 AGARICUS. 



Omphaiia. membranaceous, or slightly fleshy, flaccid, fragile when old, con- 

 vexo-umbilicate or infundibuliform, often irregular, undulato-flex- 

 uous, even-lobed, smooth, even, margin striate. Stem 2.5 cent, (i 

 in.) long, 2 mm. (i lin.) and more thick, stuffed then fistulose, 

 slightly firm, moderately tough, sometimes round, curved, some- 

 times unequal, compressed, ascending, undulated, grey. Gills 

 shortly decurrent, somewhat distant, quaternate, cinereous. 



The gills are almost darker when dried. Not caespitose. Very distinct from 

 A. philonotis, &c., but allied to A. pyxidatus, though the colour is very 

 different. In colour and irregular pileus it approaches very near to A. (Pleur.} 

 tremulus. 



On swampy ground in woods. Rare. Dec. 



Spores 12x7-8 mk. B. Name JJ/UTKOS, the wood-louse. From the cine- 

 reous colour. Fr. Monogr. i. p. 185. Hym. Eur. p. 158. Icon. t. 76. f. 3. 

 Berk. Out. p. 131. C. Hbk. n. 218. Illust. PL 209. S. MycoL Scot. n. 196. 



335. A. caespitosus Bolt. Pileus 1-2.5 cent - ( 1 A~ 1 in -) broad, 

 hygrophanous, yellowish-white when moist, becoming opaque- 

 white when dry, somewhat membranaceous, convex, somewhat 

 hemispherical, umbilicate, margin crenate, sulcate nearly to the 

 centre, otherwise smooth. Stem usually curved, fistulose, some- 

 what bulbous at the base. Gills very distant and very broad 

 (triangular), shortly decurrent, whitish. 



On peat and sandy heaths. King's Lynn, 1882. 



Formerly confounded with A. oniscus. Spores 5X 6 mk. W.G.S. Name 

 ccespes, a clump. Caespitose ; from its habit of growth. Bolt. t. 41. c. C. 

 Illust. PL 209. b. 



336. A. glaucophyllus Lasch. Pileus scarcely 12 mm. (% in.) 

 broad, mouse-colour, hygrophanous, becoming pale when dry, 

 membranaceous, infundibuliform, plicato-striate, slightly smooth, 

 become even when dry. Stem stuffed, firm. Gills decurrent, 

 somewhat distant, lanceolate, olivaceous. 



On the ground in woods. King's Lynn. 



Name yAav/cos, a bluish grey, of the olive ; <>vAAo/, a leaf. With olive-grey 

 gills. Lasch n. 217. Fr. Hym. Eur. p. 159. 



337. A. rusticus Fr. Pileus 12 mm. (y z in.) and less broad, 

 fuscous then grey when moist, when dry smooth and becoming 

 fuscous in one form, somewhat silky and hoary in another, mem- 

 branaceous, always truly and broadly umbilicate at the disc, other- 

 wise convex, striate when moist, even when dry. Stem 12 mm. 

 (Yz in.) rarely more long, i m. ()4 lin.) thick, stuffed, curt, equal 

 or thickened upwards and only where so thickened at length hoi- 



