178 STUDIES OF AMERICAN FUNGI. 



allel elevated lines, or rugae below, where it is enlarged and nearly 

 bulbous. In age it becomes flesh color the entire length and is more 

 plainly striate rugose with a yellowish tinge at the base. The stem 

 tapers gradually and strongly from the base to the apex, so that it 

 often appears long conic. 



The plant is often badly eaten by snails, so that it is sometimes 

 difficult to obtain perfect specimens. Figure 170 is from a photo- 

 graph of plants (No. 4092 C. U. herbarium) from Blowing Rock, 

 N. C. 



Boletus americanus Pk. This species occurs in woods and open 

 places, growing on the ground in wet weather. It occurs singly or 

 clustered, sometimes two or three joined by their bases, but usually 

 more scattered. It is usually found under or near pine trees. The 

 plant is 3-6 cm. high, the cap 2-7 cm. broad, and the stem is 4-8 

 mm. in thickness. It is very slimy in wet weather, the cap is yellow, 

 streaked or spotted with faint red, and the stem is covered with 

 numerous brown or reddish brown dots. 



The pileus is rounded, then convex, becoming nearly expanded 

 and sometimes with an umbo. It is soft, very slimy or viscid when 

 moist, yellow. When young the surface gluten is often mixed with 

 loose threads, more abundant on the margin, and continuous with 

 the veil, which can only be seen in the very young stage. As the 

 pileus expands the margin is sometimes scaly from remnants of the 

 veil and of loose hairs on the surface. The cap loses its bright color 

 as it ages, and is then sometimes streaked or spotted with red. The 

 tube surface is nearly plane, and the tubes join squarely against the 

 stem. The tubes are rather large, angular, yellowish, becoming dull 

 ochraceous. The stem is nearly equal, yellow, and covered with 

 numerous brownish or reddish brown glandular dots. No ring is 

 present. 



This species grows in the same situations as the B. granulatus, 

 sometimes both species are common over the same area. Figure 171 

 is from plants (No. 3991 C. U. herbarium) collected at Blowing Rock, 

 N. C, September, 1899. The species is closely related to B.flavidus 

 Fr., and according to some it is identical with it. 



Boletus granulatus L. Edible. This species is one of the very com- 

 mon and widely distributed ones. It grows in woods and open 

 places on the ground. Like B. americanus, it is usually found under 

 or near pines. It occurs during the summer and autumn, sometimes 

 appearing very late in the season. The plants are 3-6 cm. high, the 

 cap is 4-10 cm. broad, and the stem is 8-12 mm. in thickness. The 

 plants usually are clustered, though not often very crowded. 



