Murrill; Illustrations of Fungi 
3 
golden tubes, which remain for years after drying without chang- 
ing color. 
Rostkovites granulatus (L.) P. Karst. 
Granulated Rostkovites 
Plate 8o. Figures 3, 4. X 1 
Pileus subhemispheric to nearly plane, gregarious, rarely cespi- 
tose or solitary, 4-10 cm. broad, 1-1.5 cm. thick; surface very 
viscid, with easily separable cuticle, very variable in color, usually 
pinkish-gray to reddish-brown fading to yellowish, often obscurely 
spotted, especially at the center; margin sterile, projecting, in- 
curved and somewhat appendiculate when young; context thick, 
compact, elastic, pale-yellow next to the tubes, white above, un- 
changing when wounded, taste mild, somewhat mucilaginous; 
tubes short, less than 5 mm., adnate, subdecurrent, plane in mass, 
pale-yellow to dirty-yellowish, unchanging when wounded, mouths 
simple, subcircular, irregular, edges rather thick, flecked with 
pinkish-brown glandules; spores fusiform, pale-yellowish-brown, 
7-5“9-5 X 2. 5-3. 5 /u.; stipe short, thick, subequal or enlarged below, 
white or pale-yellow, dotted with pinkish-brown droplets which 
become darker on drying, solid, white within, 2.5-5 
1-1.5 cm. thick. 
Common in Europe and temperate North America, usually in 
open woods near coniferous trees. The figures show the more 
usual reddish-brown form, as well as the albino form, of this ex- 
cellent edible species. 
Rostkovites subaureus (Peck) Murrill 
Boletus americanus Peck 
Golden Rostkovites. American Boletus 
Plate 80. Figure 5. X i 
Pileus thin, convex to expanded, sometimes umbonate, 5-10 
cm. broad ; surface very viscid, yellow, often dotted or streaked 
with bright-red, dingy with age, sometimes spotted from the dry- 
ing of the gluten ; margin slightly tomentose or appendiculate 
when young; context comparatively thick, fleshy-tough, pale- 
yellow, pinkish-gray when wounded, taste mild; tubes adnate, 
scarcely decurrent, plane in mass, bright-yellow to dull-ochraceous 
flecked with yellowish, exuding drops which blacken with age, 
mouths rather large, angular, edges obtuse ; spores oblong-ellip- 
