BOLETUS. 271 



usually with a reddish tinge; spores pale olive, elongate- 

 fusiform, 13-14 X 4 /x. 



Boletus aestivalis, Fries, Epicr., p. 422 ; Cke., Hdbk., p. 257. 



In pastures under trees, &c. Esculent, one of the largest 

 species of the genus, distinguished from its allies by the 

 pale-coloured pileus, which varies from white, through grey, 

 to pale tan, yellow tubes, unchangeable flesh, and stout 

 stem, which is often 2 in. across at the thickest part. 



Boletus fulvidus. Fr. 



Pileus 2-3^ in. across, convex then plane, minutely silky, 

 shining, dry, firm, foxy brown ; pores up to ^ in. long, 

 depressed round the stem and free, openings small, equal, 

 angular, about ^- mm. across, white, then yellow with a 

 tinge of olive when old ; stem 1^2 in. long, f- in. thick, 

 equal or a little attenuated downwards, firm, smooth, 

 shining, coloured like the pileus, solid, flesh like that of the 

 pileus yellowish white, unchangeable ; spores elliptic-oblong, 

 white with a yellow tinge, 1011 x 5 /JL. 



Boletus fulvidus, Fries, Obs. 2, p. 247 ; Fries, Hym. Eur., 

 p. 517. 



On the ground under trees. Flesh of pileus and stem 

 firm and rigid. The stem becomes more or less hollow with 

 age. Allied to Boletus castaneus, which, however, is readily 

 known by the velvety stem. Fries says that the intensity 

 of colour of the pileus is variable. 



Boletus castaneus. Bull. 



Pileus 24 in. across, convex then expanded, becoming 

 almost plane, or even depressed, firm, even, minutely velvety, 

 pale chestnut, tubes free, short, about ^ in. long, free from 

 the stem, openings minute, round, white then yellow ; stem 

 2-3 in. high, base slightly incrassated, slightly attenuated 

 upwards, even, more or less velvety, same colour as the 

 pileus or paler, becoming imperfectly hollow with age. 



Boletus castaneus, Bull., t. 328 ; Krombh. t. 4, f. 28-30 ; 

 Stev., Brit. Fung., p. 181. 



In woods. Flesh white, unchangeable, rather thick. In 

 Bulliard's figures the pileus is reddish cinnamon, in those of 

 Krombholtz bright but rather light chestnut; the stem is 

 also indicated as distinctly hollow. 



