Parr 3, 1910] BOLETACEAE 137 
Pileus glabrous or subtomentose, not viscid. 
Stem reticulate, usually very distinctly so. 
Pileus, tubes, and stem tawny-brown. 23. C. tabacinus. 
Pileus red. 
Context changing to blue when wounded. 
Stem bright lem on-yellow throughout; pileus with- 
24 
out a bloom. . C, speciosus. 
Stem red below, yellow above; pileus with a 
bloom. 25. C. Peckii. 
Context not changing to blue when wounded. 
Pileus chocolate-red, 3-4 cm. broad. 26. C. Houset. 
Pileus testaceous, fading to ochraceous, 5-11 cm. 
broad. 27. C. subsanguineus. 
Pileus yellow or brown, tubes yellowish. 
Temperate species. 
Tubes large; pileus subtomentosé. 28. C. tlludens. 
Tubes of medium size; pileus usually glabrous. 
Stipe white ; pileus avellaneous-isabelline, very 
light in weight. C. subpaliidus. 
Stipe yellow or yellowish-brown. 
Context yellow ; spores 11-144 long. 30. C. vetipes. 
Context white, tinged with pink; spores 
7-9 # long. 31. C. alabamensis. 
Tropical species. 
Pileus 2-3 cm. broad, floccose-tomentose. 32. C. guadelupensis. 
Pileus 7 cm. broad, glabrous. 33. C. Maxoni, 
Stem not reticulate, 
Pileus glabrous. 
Pileus red. 
Stem yellow, sometimes with red stains; entire 
plant quickly changing to blue at any point 
where touched. 4, C. miniato-olivaceus. 
Stem red, yellow at the top ; flesh and tubes slowly 
turning blue when wounded. 35, C. bicolor. 
Pileus yellow or brown. 
Tubes changing to blue when wounded; stem 
glabrous. 36. C. pallidus. 
Tubes not changing to blue when wounded. 
Stem furfuraceous, pale-yellow; tubes pale- 
yellow to greenish-yellow. 37. C, subglabripes. 
Stem rough, with minute, stiff, black hairs; 
tubes brown to black. 
Pileus subtomentose; flesh usually spongy and drying 
readily. 
Tubes not changing to blue when wounded. 
Tubes whitish, becoming yellow; mouths small, 
w 
ies) 
._C. scabripes. 
cireular. 39. C. Roxanae. 
Tubes yellow; mouths large and angular, espe- 
cially near the stem. 40. C. subtomentosus. 
Tubes small, yellowish, becoming brick-red on 
drying or when bruised: pileus large, 9-13 cm. 
in diameter and 3 cm. thick. 41. C. domentipes. 
Tubes changing to blue when wounded. 
Tubes at first grayish-white, discolored later by 
the spores; stem bluish-green at the top. 
Pileus conspicuously reticulate-rimose. 42. C. fumosipes. 
Pileus not reticulate-rimose. 43. C. sordidus. 
Tubes yellow and large; stem and pileus usually 
red, the latter often cracked. 44. C. communis. 
1. Ceriomyces Russellii (Frost) Murrill, Mycologia 1: 144. 1909. 
Boletus Russellii Frost, Bull. Buffalo Soc. Nat. Sci. 2: 104, 1874, 
Pileus convex, 3-7 cm. broad, 2-3 cm. thick; surface dry, slightly viscid when moist, 
clothed with a thick tomentum, agglutinated in raised squamules, presenting a reticulate 
appearance, often rimose-areolate, light-brown to isabelline with brown patches: context 
thin, cremeous, unchanging, taste mild, slightly salty; tubes plane, adnate or very slightly 
sinuate, depressed, cremeous when young, dark-flavous with a tinge of green at maturity, 
mouths large, angular, uniform, edges thin: spores ellipsoid, distinctly longitudinally 
striate, olivaceous, 15-17 7-8: stipe long and slender, tapering upward, very coarsely 
reticulate and fluted, the margins broad and lacerate, swelling in wet weather, somewhat 
glutinous even in dry weather, bright-pinkish flesh-colored throughout, the depressions 
usually not darker, firm, solid, or slightly stuffed, yellow within, 5-12 cm. long, 1-1.5 cm. 
thick at the base. 
