LEUCOSPORI. 25 



Mesomorpbi. Smaller, slender, &*c. Lepiota. 



42. A. sistratus Fr. Pileus 2.5-4 cent. (1-1% in.) broad when 

 flattened, whitish, often darker at the disc, turning light-yellowish 

 or flesh-colour, slightly fleshy, campanulate, then expanded and 

 obsoletely umbonate, pruinate with shining atoms ; flesh thin, 

 soft, fragile, whitish. Stem 5-7.5 cent. (2-3 in.) long, 2-4 mm. 

 (1-2 lin.) thick, fistulose, scarcely stuffed within w r ith lax spider- 

 web fibrils, equal, silky fibrillose and pruinate, white. Ring fib- 

 rillose, torn, appendiculate round the margin ofthepileus, very fuga- 

 cious. Gills free, but reaching the stem, crowded, 4 mm. (2 lin.) 

 broad, white. 



Thin, delicate, fragile. Nearest to A. mesomorphus}$\\\\. in natural affinity. 



On sandy ground. Forres. 



Remarkable for the filamentous ring. B. & Br. Name sistrum, a rattle 

 used in the rites of Isis. From some fancied resemblance in form. Fr. Monogr. 

 i. p. 30. Hym. Eur. p. 37. Icon. t. if./". 3. B. & Br. ?i. 1185. S. Mycol. 

 Scot. n. 28. ' C. Illust. PL 85. 



43. A. seminudus Lasch. Pileus whitish or flesh - colour, 

 slightly fleshy, campanulato-expanded, umbonate, floccoso-mealy, 

 at length naked, appendiculate at the margin with the torn veil. 

 Stem fistulose, thin, mealy. Gills reaching the stem, thin, white. 



Very thin, delicate. 



In woods. King's Lynn, &c. 



Spores 4X 2 mk. B. & Br. Name semi, half, nudus, naked. From the 

 stem remaining mealy while the pileus becomes naked. Lasch. Linn. n. 17. 

 Fr. Hym. Eur. p. 38.' B. & Br. n. 1634, 1836. C. Illust. PL 19. a. 



44. A. Bucknalli B. & Br. Pileus nearly 2.5 (i in.) broad, 

 white, sprinkled with lilac dust, campanulate then convex. Stem 

 7.5 cent. (3 in.) long, dilated at the base, sprinkled downwards 

 with lilac dust. Gills scarcely reaching the margin, white. 



Smell strong of gas-tar. 



On the ground. Bristol. 



Spores 8x3 mk. B. & Br. Name after Cedric Bucknall. B. dr* Br. 

 n. 1836. C. Illust. PL 19. b. 



45. A. mesomorphus Bull. Pileus reaching 2.5 cent, (i in.) 

 broad, generally less, becoming yellow or whitish, slightly fleshy, 

 very thin, campanulate then expanded, naked, dry, even, smooth. 

 Stem 5-7.5 cent. (2-3 in.) long, 2 mm. (i lin.) thick, fistulose, 

 slightly attenuated upwards, even, smooth, of the same colour as 



