BOLETUS. 269 



Boletus sulphureus. Tr. 



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

 STilphur-yellow, flesli pale-yellow, becoming more or less 

 blue when broken, 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 sulphureus, Pries, 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 

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



Boletus variecolor. B & Br. 



Pileus 1^ 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, 

 yellow; stem about 2 in. long, base thickened, |- in. or more 

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

 pubescent and rufescent upwards, yellowish below, solid ; 

 spores elliptic-fusiform, slightly oblique, pale olive, 14x4ju,. 



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. 

 With the habit of B. suhtomentosus and B. chrysenteron, but 

 the stem is clavate and reticulated. 



Boletus olivaceus. Schaeff. 

 Pileus 2-3 in; across, convex, margin at first involute, 

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



