LEUCOSPORI. 179 



Illust. PL 259. b.^ S. Mycol. Scot. n. 223. Letell. t. 706./. i. A. pubescens Pleurotus. 

 Sow. t. 321. 



** P ileus fleshy, gelatinous or viscid, &^c. 



389. A. mastrucatus Fr.— Pileus 2.5-10 cent. (1-4 in.) broad, 

 mouse-grey, as if prickly withfloccose, squarrose scales of the saine 

 colour, fleshy, when full grown obovate or tongue-shaped, soft, 

 flaccid, margin involute but lobed when full grown and luxuri- 

 ant; stratum of flesh double, the upper, that of the thick (i m., yi 

 lin.) pellicle, gelatinous, pliant, mouse-fuscous; the lower (that of 

 the flesh proper) a little thicker, pallid. Gills at first concurrent 

 in an excentric umbilicus (without the rudiment of a stem), then 

 converging to the base of the pileus, broad, somewhat distattt, 

 quaternate, whitish-grey. 



The first of a series of distinguished species, which form a remarkably nat- 

 ural group. Larger than following species, resupmate when young, adnata 

 at the back, excentrically cup-shaped, then reflexed, sessile, somewhat im- 

 bricated. 



On old trunks. Rare. 



Name — mastruca, a sheepskin. From its woolly-like coat. Fr. Monogr. 

 i. p. 254. Hy7n. Eiir. p. 179. Berk. Out. p. 138. C. Hbk. n. 127. Illust. 

 PL 243. A. echinatus Sow. t. 99. 



390. A. atro-cseruleus Fr.— Pileus 2.5-5 cent. (1-2 in.) broad, 

 commonly dark azure-blue, more rarely fuscous, at the first re- 

 supinate, soon reflexed, horizontal, obovate or reniform, villous, 

 rarely slightly smooth, slightly wrinkled (because the cuticle is 

 contracted in drying) when dry ; flesh soft, the upper stratum 

 (that of the pellicle) toughly gelatinous, as much as 4 mm. (2 

 lin.) thick, fuscous-blackish, the lower (that of the flesh proper) 

 thinner, whitish. Gills at first concurrent, then reaching the 

 base, broad, in groups of 4-8, whitish, at leiigth becoming light 

 yellow. 



Sessile, gregarious, somewhat imbricated. Here and there emitting a very 

 pleasant odour. 



On trunks, birch, &c. Rare. Nov.-Dec. 



Spores 3x8 mk. W.G.S. Name — ater, black; cceruletis, azure-blue. Fr. 

 Monogr. i. p. 255. Hyin. Eur. p. 179. Berk. Out. p. 138. C. Hbk. n. 128. 

 Illust. PL 243. S. Mycol. Scot. n. 224. Sau?id. ^f Sm. t. 6./. i. A. alneus 

 SchcBff. t. 246.7; 3, 8, 9. 



391. A. Leightoni Berk. — Pileus lo mm. (5 lin.) broad, umber 

 then lead-coloured, at first obliquely conical, furfuraceous, with 

 short scattered bristles intermixed ; flesh consisting of two dis- 

 tinct strata ; the upper gelatinous, of the colour of the pileus, the 



