BOLETUS. 167 



and where it is known, it is found to differ in closely allied Boletus. 

 species ; and hence in arranging them it is necessary to take the 

 colour of the tubes (and not as in the Agaricini the colour of the 

 spores) as the basis of the primary groups. Fr. Hyvi. Eur. p. 

 496, &c. 



Ser. I. EUCHROI. (e\>, well ; xpws, colour). Tubes bright-coloured, com- 

 monly yellow, not white or grey. 



A. Viscipelles (viscum, bird-lime ; pellis, a skin). Pileus covered over -with 

 a viscous pellicle. Stem solid, not bulbous, nor reticulated with veins. Tubes 

 adnate to the stem behind, rarely sinuate, of one colour. Spores of such as 

 are sufficiently well known yellowish. 



* Genuini, forming a continuous series. 



** Departing from the type, of doubtful affinity. 



B. Subtomentosi (sub, foment um, down). Pileus destitute of a viscid 

 pellicle, villous when youn&, rarely at length becoming smooth. Stem at the 

 first extended, not bulbous, nor reticulated with veins, though here and there 

 rugose or striate. Flesh rarely changing colour. Tubes of one colour, 

 adnate. 



C. Subpruinosi (sub, prui/ia, hoar-frost). Tubes adnate to the stem, 

 yellowish. Stem equal, even, not bulbous nor reticulated. Pileus smooth, 

 but most frequently pruinose. 



D. Calopodes (/caA6?, beautiful ; rov?, a foot). Stem stout, at the first 

 bulbous, in typical species reticulated with veins. Tubes adnate, pores not 

 reddish. 



* Genuini. Stem reticulated with veins, commonly of a beautiful red. 

 ** Departing from the type, of uncertain affinity. Stem ciavate, even. 



E. Edules (edulis, edible). Stratum of tubes, which at the first are not 

 reddish at the orifice, but have usually a white stuffing, rounded and depressed 

 about the stem, somewhat free. Stem stout, bulbous, resembling that of the 

 Luridi, only (except in B. edulis) it is neither reticulated, nor dotted with 

 small scales, nor red. Flesh scarcely changing colour, taste pleasant. Pre- 

 eminent for their esculent qualities. 



F. Luridi (luridus, lurid). Stratum of tubes rounded towards the stem and 

 free ; pores at the first stopped up, red. Pileus compact, then soft, pulvinate ; 

 flesh juicy, changing colour. Stem stout, at first curt, bulb-shaped, then 

 elongated and nearly equal, somewhat reticulated or dotted. Growing chiefly 

 in deciduous woods. Very poisonous. 



Ser. II. TEPHROLEUCI (re^po?, ash-coloured ; Aewd?, white). Tubes at 

 first white or grey. 



G. Favosi (favus, honeycomb. From the size and shape of the tubes). 

 Tubes large, angular, unequal, adnate to the stem, but often shortened 

 around it, not however forming a roundedly-free stratum. Spores, as far as 

 known, brown. 



H. Versipelles (verto, to change ; pellis, a skin. From the typical species 

 D. versipellis). Tubes minute, round, equal, crowded together in a convex 

 stratum, which is free from the stem. Spores ferruginous. 



I. Hyperhodii (VTTO, somewhat ; poSov, a rose. From the colour of the 

 spores). Tubes adnate to the stem, whitish ; spores rosy then white-flesh- 

 colour. 



K. Cariosi (caries, rottenness). Stem externally never reticulated, in- 

 ternally stuffed with a spongy pith, at length commonly hollowed out. Tubes 



