REPORT OF THE STATE BOTANIST I9IO 65 



Among sphagnum. Stow, Massachusetts. September. S. Davis. 



The pecuHar habitat, deeply convex reddish brown pileus witn 

 its sHghtly extended incurved margin and white flesh are distin- 

 guishing features of this variety. In the last mentioned character 

 it resembles Boletus albocarneus Pk. 



Pileus hemisphaericus convexissimusve, badius, praeter lamellas 

 margine tenue incurvo extentus, carne alba albidave; tubuli pilei 

 carnis carassitate longiores. 



Melanconium bicolor candidum 



This differs from the typical form in having the stroma pure 

 white and the spores obovate or narrowed toward one end. 



Bark of red mulberry, Morus rubra L. Rolling Bay, 

 Washington. July. E. Bartholomew. 



Stroma candidum ; sporae obovatae vel basi angustatae. 



EDIBLE FUNGI 

 Boletus albus Pk. 



WHITE BOLETUS 



Plate 121, figures i-^ 



Pileus convex, viscid when moist, white, flesh white or yellow- 

 ish; tubes small or medium, subrotund, adnate, whitish becoming 

 3^ellow or ochraceous ; stem short, equal or slightly tapering down- 

 ward, glandular dotted, white; spores ochraceous, subfusiform, 

 8-9 /-/- long, 4-4.5 A'- broad. 



The white boletus is easily distinguished from all our other 

 species by its white viscid cap and its glandular dotted stem. Its 

 cap varies in its horizontal diameter from i . 5-3 . 5 inches. It is 

 generally convex, but in large plants it is often expanded until it 

 is nearly or quite plane. Its white color is not well retained in 

 drying. It is therefore important to see fresh specimens in order 

 to identify the species satisfactorily. The flesh is white or barely 

 tinged with yellow. Sometimes the fresh plant emits a peculiar, 

 somewhat fetid or strong, odor. 



The tubes in the young plant are whitish or but slightly tinged 

 with yellow, but when mature they are ochraceous and the mouths 

 are dotted with dark reddish brown glands. The stem is short, 

 generally less than the diameter of the cap, cylindric or slightly 

 narrowed at the base, soHd, without any collar, dotted with reddish 



