46 



CIRCULAR 14 3, U. S. DEPARTMENT OF AGRICULTURE 



the aimulus; the auiiulus is variable, sometimes persisting as a narrow ring 

 and again aiipearint; as a broad collar. 



The cap is 8 to 4 inches broad ; the stem is 21/2 to 3 inches high. 



This is an excellent edible species of wide geographic distribution, occurring 

 commonly in june woods. 



A very simihir species is Boletus suhluteus, which is ornamented with dots 

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



BOLETUS GRANULATUS 



The cap is convex or nearly plane, color variable, when moist viscid and 

 reddish brown, paler and yellowish when dry; viscid or glutinous; the flesh 

 is pale yellow; the tubes are short, adnate, yellowish, mouths granulated; 

 the stem is pale yellowish, dotted above. 



A nearly related species, Boletus brcvipes, is distinguished from B. (jrnnu- 

 latus by a shorter stem and the absence or indistinctness of granulations 

 on the mouths of the tubes and stem. 



Ku.i lit 4i.— J!ol(tus fvUcus (I'orm with noureticulate stem) 

 BOLETUS FEXLEUS. BITTER B0LI':TUS 



(Fis. 41) 



The cap is convex or nearly plane, tirni, bect)ming soft, color variable, pale 

 yellowish, grayish brown, reddish lirown, or chestnut: the flesh is white, 

 often changing to flesh color when wounded, and of bitter taste; the tubes 

 are adnate, long, depressed around the stem, mouths angular, white, becom- 

 ing tinged with flesh color; the stem is similar in color to the cap. but jialer, 

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

 reticulated above. 



Tlie cap is 8 to 4 inches broad; the stem is 2 to 3 inches long. 



This is a common and widely distributed species. It is exceedingly con- 

 spicuous on account of its color, size, and solidity ; though not poisonous, it is 

 very bitter. 



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

 and has coarse reticulations on the sterh. 



