TUBE-BEARING FUNGI. 177 



or free. They are white, then flesh color, and in age become brown. 

 The stem is even, or it tapers slightly upward, straight or ascending, 

 whitish or yellow above, or below, sometimes yellowish the entire 

 length. The flesh is also yellowish, especially at the base. The 

 entire surface is marked with reddish or pinkish dots. 



Figure 168 is from plants (No. 4085 C. U. herbarium) collected 

 at Blowing Rock, N. C., during September, 1899. 



Boletus vermiculosus Pk. This species was named B. vermiculosus 

 because it is sometimes very "wormy." This is not always the 

 case, however. It grows in woods on the ground, in the Eastern 

 United States. It is from 6-12 cm. high, the cap from 7-12 cm. 

 broad, and the stem 1-2 cm. in thickness. 



The pileus is thick, convex, firm, smooth, and varies in color from 

 brown to yellowish brown, or drab gray to buff, and is minutely 

 tomentose. The flesh quickly changes to blue where wounded, 

 and the bruised portion, sometimes, changing to yellowish. The 

 tubes are yellowish, with reddish-brown mouths, the tube surface 

 being rounded, free or nearly so, and the tubes changing to blue 

 where wounded. The stem is paler than the pileus, often dotted with 

 short, small, dark tufts below, and above near the tubes abruptly 

 paler, and sometimes the two colors separated by a brownish line. 

 The stem is not reticulated. Figure 169 is from a photograph of 

 plants (No. 4132 C. U. herbarium) collected at Blowing Rock, N. C., 

 during September, 1899. 



Boletus obsonium (Paul.) Fr. This species was not uncommon in 

 the woods at Blowing Rock, N. C., during the latter part of August 

 and during September, 1899. It grows on the ground, the plants 

 usually appearing singly. It is from 10-15 cm. high, the cap 8-13 

 cm. broad, and the stem 1-2 cm. in thickness, considerably broader 

 at the base than at the apex. 



The pileus is convex to expanded, vinaceous cinnamon, to pinkish 

 vinaceous or hazel in color. It is soft, slightly tomentose, and when 

 old the surface frequently cracks into fine patches showing the pink 

 flesh beneath. The thin margin extends slightly beyond the tubes, 

 so that it is sterile. The flesh does not change color on exposure to 

 the air. The tubes are plane, adnate, very slightly depressed around 

 the stem or nearly free, yellowish white when young, becoming dark 

 olive green in age from the color of the spores. The tube mouths 

 are small and rotund. The spores caught on white paper are dark 

 olive green. They are elliptical usually, with rounded ends, 12-15 

 x 4-5 /^. The stem is white when young, with a tinge of yellow 

 ochre, and pale flesh color below. It is marked with somewhat par- 



