BOLETUS. 269 



Boletus sulphureus. Fr. 



Pileus convex, then plane, compact, silky-tomentose, 

 sulphur-yellow, tiesh pale-yellow, becoming more or less 

 blue when bruken, but golden yellow when exposed to the 

 air, reddish near the tubes ; tubes 1-2 lines long, adhering 

 more firmly together than usual, changing colour when 

 touched, at length spotted with rust-colour ; openings 

 minute, compound, sulphur-yellow, then greenish ; stem 

 1—2 in. long, 1 in. thick, firm, ventricose, even, smooth, 

 sulphur-yellow, then dingy ferruginous; spores pale-yellow, 

 then ochraceous. 



Boletus suljyhureus, Fries, Epicr., p, 413 ; Stev., Brit. Fung., 

 p. 171. 



Amongst sawdust, chips, &c. 



In dense clusters, springing from abroadly expanded, woolly, 

 golden-yellow mycelium, with the appearance of Agaricus 

 spectabilis. Pilei wavy and growing into each other. (Fries.) 



Boletus variecolor. B & Br. 



Pileus 1 J- in. across, convex, olive, subtomentose, margin 

 involute, flesh thick, blackish-purple below the cuticle, 

 remainder like that of the stem white, tinged yellow here 

 and there; pores about 2 lines long, free, openings minute, 

 3'ellow; stem about 2 in. long, base thickened, ^ in. or more 

 across, 3 in. thick at apex, apex reticulated, minutely 

 l)ubescent and rufescent upwards, yellowish below, solid; 

 spores elliptic-fusiform, slightly oblique, pale olive, 14x4/x. 



Boletus variecolor, B. & Br., Ann. Nat. Hist., n. 1020, 

 pi. 13, f. 3 (1865); Cke., Hdbk., p. 255. 



In woods. Agreeing with B. olivaceus in having the 

 margin involute, but distinguished from this and other 

 allies by the dark-purple colour below the cuticle of the 

 pileus. The gills are described as free by B. & Br., and 

 figured as broadly adnate, but an examination of the type 

 specimens show them to be shortened round the stem. 

 "NV^ith the habit of jB. suhtomentosm and B. chrysenieron, but 

 the stem is clavate and reticulated. 



Boletus olivaceus. Schaeff. 

 Pilens 2—3 in. acr(jss, convex, margin at first involute, 

 brownish-olive, glabrous; tubes adnate, 2-3 lines long, 



