210 AGARICUS. 



Leptonia. umbilicate, rimoso-squamulose. Stem cartilaginous, fistulose, 

 smooth, even, dark blue, white-woolly at the base. Gills adnate, 

 separating, pallid deep blue, equally attenuated from the stem to 

 the margin of the pileus, edge of the same colour. 



Gregarious, fragile. Its stature approaches nearer to A. asprellus than to 

 A. chalybceus, with which it is often confounded : allied to Nolanece. There 

 are two remarkable forms, one with the pileus at first black blue, the other 

 date-brown-mouse-colour, with darker disc. 



On the ground among grass. Aber, 1867. Sept. 



Name from Lapis lazuli, ultramarine. From the colour of the stem. Fr. 

 Monogr. \. p. 288. Hym. Eur. p. 203. B. 6 Br. n. 1227. 



**** Gills pallid, &c. 



462. A. incanus Fr. Pileus 2.5 cent, (i in.), variegated fuscous 

 and green, becoming cinereous when dry, somewhat membran- 

 aceous, fragile, convex then expanded, umbilicate, striate, smooth, 

 slightly silky when dry. Stem 2.5-5 cent. (1-2 in.) long, 2 mm. 

 (i lin.) thick, fistulose, remarkably cartilaginous, even, smooth, 

 green or fuscous-green, neither pruinose nor rough-dotted at the 

 apex. Gills adnate, decurrent with a tooth, at length separating, 

 4-6 mm. (2-3 lin.) broad at the middle, plane, distant, 'whitish- 

 green, then flesh-colour. 



The pileus is more rarely fibrillose at the disc. Gregarious. According to 

 Secretan the stem varies azure-blue. 



In pastures. Frequent. July-Sept. 



The stem often with beautiful verdigris-coloured down at the base. Smell 

 exactly like that of mice. M.J.B. Spores 8 mk. W.G.S.; oval. M.J.B. 

 Name incanus, grey, hoary. Fr. Monogr. i. p. 289. Hym. Eur. p. 204. 

 Berk. Out. p. 147. C. Hbk. n. 279. Illust. PL 336. S. Mycol. Scot. n. 261. 

 A. murinus Sow. t. 162. 



463. A. formosus Fr. Pileus 2.5 cent, (i in.) broad, yellow- 

 wax colour, sprinkled over with mhiiite fuscous squamules or 

 fibrils, somewhat membranaceous, slightly tough, convex then 

 plane, umbilicate, striate. Stem 5 cent. (2 in.) long, scarcely 2 

 mm. (i lin.) thick, cartilaginous, somewhat fistulose, but internally 

 stuffed with soft white flocci, equal, even, smooth, shining, yellow. 

 Gills adnate, decurrent with a tooth, somewhat distant, light 

 vellow-pallid, then flesh-colour, edge quite entire, of the same 

 colour. 



The minute squamules on the pileus give it the appearance of being blown 

 upon with soot. Very much allied to A. asprellus. 



Among Equisetum. Scarborough. Sept. 



