450 PLEUROTUS 



stem, comparatively broad, somewhat distant. Flesh white, thin at 

 the margin. Spores elliptical, 9-10 x 5/x,, often depressed on the one 

 side. On dead twigs, decayed wood, rabbit dung and fungi. March 

 Nov. Not uncommon, (v.v.) 

 P. nidulans (Pers.) Fr. = Crepidotus nidulans (Pers.) Quel. Ench. 



B. P. fleshy, striate, with an upper gelatinous layer, 

 or viscous pellicle. 



1465. P. mastrucatus Fr. (= Calathinus mastrucatus (Fr.) Quel.) Cke. 

 Illus. no. 289, t. 243, upper figs. 



Mastrucatus, clothed in a sheep-skin. 



P. 3-12 cm., mouse grey, as if prickly with fioccose, squarrose, con- 

 colorous scales, obovate, or tongue-shaped, soft, flaccid; margin in- 

 volute, lobed. Gills whitish-grey, concurrent in an excentric umbilicus, 

 then converging to the base of the pileus, broad, somewhat distant. 

 Flesh, upper layer gelatinous, mouse-fuscous, the lower a little thicker, 

 pallid. Spores white, "pruniform, 7-9 /i" Quel. On old beech 

 stumps. Rare. 



1466. P. atrocaeruleus Fr. (= Calathinus atrocaeruleus (Fr.) Quel.) 

 Cke. Illus. no. 289, t. 243, lower figs. 



Ater, black; caeruleus, azure-blue. 



P. 2-5-5 cm., dark azure-blue, rarely fuscous, at first resupinate, 

 soon reflexed, horizontal, obovate, or reniform, villose, slightly 

 wrinkled when dry. Gills whitish, becoming light yellow, at first con- 

 current, then reaching the base, broad. Flesh, upper layer toughly 

 gelatinous, as much as 4 mm. thick, fuscous-blackish, the lower 

 thinner, whitish. Spores white, elliptical, 7-8 x 4-5/x, often de- 

 pressed on one side, with a large central gutta. Cystidia abundant, 

 fusiform, 46-60 x 8-1 1/u, very thick walled, sometimes septate at 

 the base, encrusted in the upper portion. Smell sometimes pleasant. 

 On beech, birch, and poplar stumps. Oct. Dec. Uncommon, (v.v.) 



1467. P. Leightonii Berk. Cke. Illus. no. 290, t. 260, upper figs. 

 The Rev. W. A. Leighton, the eminent Shropshire lichenologist. 



P. 10 mm., umber, then lead-coloured, at first cyphellaeform, ob- 

 liquely conical, furfuraceous, with short, scattered, black bristles inter- 

 mixed. Gills pallid tan colour, rather thick, distant, somewhat forked 

 at the base, slightly undulated, obscurely wrinkled at the base, the 

 interstices scarcely reticulated. Flesh, upper layer gelatinous, of the 

 colour of the pileus, the lower white. Spores white, "somewhat 

 sausage-shaped, slightly curved, 10 x 3/x" Sacc. On wood, rotten 

 rails. Dec. Rare. 



1468. P. algidus Fr. (= Calathinus algidus (Fr.) Quel.) Cke. Illus. 

 no. 290, t. 260, lower figs. Algidus, cold. 



P. 1-5 cm., umber, or rufous brown, at first resupinate, then ex- 



