1914] 
OVERHOLTS—THE POLYPORACEZ OF OHIO 133 
differences in size and habit. In Europe the plant is usually 
known as F. salicinus Pers. ex Gill. and it was so reported from 
Ohio by Morgan. It is entirely different from all other species 
of Fomes except F. fulvus Scop. ex Gill. and F. ribis Schum. 
ex Fries in the thin pileus, often conchate in form and with a 
concave hymenium. Usually the pileus is not more than 1 
em. thick. Р. fulvus Scop. ex Gill. is distinct in its habitat 
as is also F. ribis Schum. ex Fries. 
10. F. fulvus Scop. ex Gill. Champ. Fr. 1: 687. 1878. 
Boletus fulvus Scop. Fl. Carn. 2:469. 1772. [2nd ed.] Poly- 
porus fulvus Fries, Epicr. Syst. Myc. 466. 1838. 
Plants perennial, sessile, effused-reflexed or entirely resupinate; 
pileus dimidiate, convex, 0-4 x 3-8 x 0.5-3 em., woody, fulvous to 
ferruginous when young, becoming grayish black or black 
in age, encrusted, minutely velvety to glabrous, sometimes 
suleate, margin rather thick, acute or obtuse; context dark 
brown, woody, 3-8 mm. thick; tubes 2-4 mm. long, rather 
distinctly stratified, the mouths circular to slightly angular, 
grayish brown to tawny, averaging 4-5 to a mm., dissepiments 
rather thick, entire. 
Growing only on wood of species of Prunus. Not common. 
One should have no trouble in identifying this species if 
the habitat is taken into consideration as it is the only perennial 
form that grows on Prunus. Morgan reported it under the 
name of F. supinus Schw. 
II. F. rimosus Berk. ex Cooke, Grevillea 14:18. 1885. 
Polyporus rimosus Berk. Hooker's Lond. Jour. Bot. 4:54. 
1845. Pyropolyporus robiniae Murrill, Bull. Torr. Bot. Club 
30:114. 1903. 
Plants perennial, sessile; pileus dimidiate, convex to ungulate, 
3-20 x 6-30 x 1.5-10 em., woody, at first fulvous, becoming 
dark brown or black, not encrusted, velvety in young speci- 
mens, glabrous and very rimose in old plants, concentrically 
suleate, margin thick or thin, obtuse or acute; context fulvous 
to rusty brown, woody, 0.5-3 cm. thick, zonate; tubes 1-5 mm. 
long, indistinctly stratified in many layers, the mouths fulvous 
to rusty brown, circular, averaging 5-6 to а mm., walls rather 
thick and entire; spores brown, smooth, globose, 4-би in 
diameter. 
