Diagnoses of American Porias—II* 
L. O. OVERHOLTS 
(WITH PLATES 13 AND 14 AND THREE TEXT FIGURES) 
PorIA CORTICOLA (Fr.) Cooke, Grevillea 14: 113. 1886 
Polyporus corticola Fr. Syst. Myc. 1: 385. 1821. 
iginal Description: Effusus, firmus, glaber, albus, punctis 
Miteais nudis. Duplex status lectus: a) populneus, seriato- 
elongatus, confluens, crassior, adhaerens, tuberculosus, pal- 
lescens, eee spurio tumido villoso, punctis rotundis aequal- 
ibus. fagineus, latissime effusus punctis integris. Ad 
cortices ee Populi. b. Fagi. Per annum (V.V.). 
Redescription: ree soft and watery when fresh, broadly 
effused for many centimeters where test: developed, separable 
times completely fertile and sometimes broadly sterile and 
ranous; subiculum very thin, inconspicuous, eta no a 
more than 0.5 mm, thick; tubes unstratified, 2-5 mm. lon 
mouths white when fresh, white or more commonly sellowiel 
(cinnamon buff) on drying, often glistening, angular, very thin- 
walled, entire or becoming finely de ee ee averaging 
g 
two to four, 4.5-5.5 X 3-3-5 ¥; cystidia various, but usually 
present, either as fusoid projecting bodies, as smaller fusoid 
diameter 2-4 p. in trama, se v. in subiculum. 
On bark and wood of deciduous trees; recorded from Acer, 
Fagus, and Pepulus. 
Specimens Examined: Swan River, Manitoba, Canada; 
Winnipeg, Manitoba, Canada (three collections); Harrisville, 
New York; Stone Valley, Pennsylvania; Chain Bridge, Mary- 
land; West Elkton, Oberlin, and Oxford, Ohio; Creve Coeur 
Lake, Missouri (two collections); Custer, South Dakota; Mis- 
soula, Montana; Priest River, Idaho. 
Signi yoga from the Department of Botany, The Pennsylvania State. 
College, No. 42. For the first paper of this series, see Mycologia 14: 1-11. 
pl. 1 +f. 1-6. sty 
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