184 STUDIES OF AMERICAN FUNGI. 



ochraceous, 15-18 x 6-8//. The plants are 5-8 cm. high, the caps 

 5-8 cm. broad, and the stems 6-12 mm. in thickness. 



Figure 170 is from plants collected in the Blue Ridge mountains, 

 Blowing Rock, N. C, September, 1899. 



Boletinus porosus (Berk.) Pk. — This very interesting species is 

 widely distributed in the Eastern United States. It resembles a Polvp- 

 orus, though it is very soft like a Boletus, but quite tenacious. The 

 plants are dull reddish-brown, viscid when moist, and shining. The 

 cap is more or less irregular and the stem eccentric, the cap being 

 sometimes more or less lobed. The plants are 4-6 cm. high, the 

 cap 5-12 cm. broad, and the short stem 8-12 mm. in thickness. It 

 occurs in damp ground in woods. 



The pileus is fleshy, thick at the middle, and thin at the margin. 

 The tubes are arranged in prominently radiating rows, the partitions 

 often running radiately in the form of lamellae, certain ones of them 

 being more prominent than others as shown in Fig. 171. These branch 

 and are connected by cross partitions of less prominence. This char- 

 acter of the hymenium led Berkeley to place the plant in the genus 

 Paxi/liis, with which it does not seem to be so closely related as with 

 the genus Boletus. The stratum of tubes, though very soft, is very 

 tenacious, and does not separate from the flesh of the pileus, thus 

 resembling certain species of Polyponts. Figure 171 is from plants 

 collected at Ithaca. 



Strobilorayces strobilaceus Berk. Edible. — This plant has a peculiar 

 name, both the genus and the species referring to the cone-like ap- 

 pearance of the cap with its coarse, crowded, dark brown scales, 

 bearing a fancied resemblance to a pine cone. It is very easily dis- 

 tinguished from other species of Boletus because of this character of 

 the cap. The plant has a very wide distribution though it is not 

 usually very common. The plant is 8-14 cm. high, the cap 5-10 

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



The pileus is hemispherical to convex, shaggy from numerous large 

 blackish, coarse, hairy, projecting scales. The margin of the cap is 

 fringed with scales and fragments of the veil which covers the tubes 

 in the young plants. The flesh is whitish, but soon changes to red- 

 dish color, and later to black where wounded or cut. The tubes are 

 adnate, whitish, becoming brown and blackish in the older plants. 

 The mouths of the tubes are large and angular, and change color 

 where bruised, as does the flesh of the cap. The stem is even, or 

 sometimes tapers upward, often grooved near the apex, very tomen- 

 tose or scaly with soft scales of the same color as the cap. The 

 spores are in mass dark brown, nearly globose, roughened, and 



