MUSHROOMS AND OTHER COMMON FUNGI. 89 



Cap 1 to 3 inches broad; stem I to i> inches long. 



Authors differ concerning the edibility of this species; consequently extreme cau- 

 tion should be used to avoid collecting il for Boletus bicolor, which is edible. 



Boletus edulis. (Edible.) 



Cap convex to expanded, smooth, firm when young, becoming soft in age, the color 

 varying from grayish red to brownish red, generally paler on the margin; flesh white 

 or yellowish, sometimes reddish beneath the cuticle; tubes convex, nearly free, long, 

 minute, white, then yellow and greenish; stem variable in length, straight or flexu- 

 ous, equal or bulbous, more or less reticulated, whitish, pallid, or brownish. 



Cap 4 to 6 inches broad; stem 2 to 6 inches long. 



A species of frequent occurrence and the one most commonly eaten of this genus. 



Boletus folk-us. 



Cap convex or nearly plane, firm, becoming soft, color variable, pale yellowish, 

 grayish brown, reddish brown, or chestnut; flesh, white, often changing to flesh color 

 when wounded, taste bitter; tubes adnate, long, depressed around the stem, mouths 

 angular, white, becoming tinged with flesh color; stem similar in color to the cap, 

 but paler, variable, long or short, equal or tapering upward, sometimes bulbous, 

 reticulated above. 



Cap 3 to 4 inches broad; stem 2 to 3 inches long. (PI. XXXI, fig. 2.) 



This is a common and widely distributed species. It is exceedingly attractive on 

 account of its color, size, and solidity; though not poisonous, it is so bitter that a small 

 quantity renders a whole dish unpalatable. 



A variety, Boletus felleus obesus, attains a size of about a foot in diameter and has 

 coarse reticulations on the stem. 



Boletus granulatus. 



Cap convex or nearly plane, viscid or glutinous and rusty brown when moist, yel- 

 lowish when dry; flesh pale yellow; tubes short, adnate, yellowish, mouth granu- 

 lated; stem pale yellowish, dotted above. 



This species is considered edible by most authors, but it is not attractive on account 

 of the viscid character of the cap. 



A nearly related species, Boletus brevipes, is distinguished from B. granulatus by a 

 shorter stem and the absence of granulations on the mouths of the tubes. 



Boletus luteus. (Edible.) 



Cap convex, becoming nearly plane, viscid or glutinous when moist, dull yellowish 

 to reddish brown, sometimes streaked or spotted; flesh whitish or dull yellowish; 

 tubes adnate, minute, yellow becoming darker with age; stem stout, pale yellowish, 

 brownish or reddish, dotted above the annulus; annulus variable, sometimes per- 

 sisting as a narrow ring and again appearing as a broad collar. 



Cap 3 to 4 inches broad; stem 2\ to 3 inches high. 



An excellent edible species of wide geographic distribution, occurring commonly 

 in pine woods. 



A very similar species is Boletus subluteus, which is ornamented with dots both 

 above and below the annulus. This fungus is also considered edible. 



STROBILOMYCES. 



The genus vStrobilomyces closely resembles Boletus, but it may be 

 distinguished by the less easily separable tubes and extremely scaly 

 cap and stem. 



