1920] 
BURT—THELEPHORACEAE OF NORTH AMERICA. XII 143 
eley, Brit. Fungi, 271. 1860; Saec. Syll. Fung. 6: 572. 1888; 
Massee, Linn. Soc. Bot. Jour. 27: 191. 1890. 
Plate 4, figs. 38, 39. 
Thelephora rugosa Persoon, Syn. Fung. 569. 1801; Myc. 
Eur. 1: 127. 1822; Albertini & Schweinitz, Consp. Fung. 274. 
1805; Fries, Syst. Myc. 1: 489. 1821; Elenchus Fung. 1: 177. 
1828. 
Illustrations: Istvanffi Jahrbuch. f. wiss. Bot. 29: 
Ja 115 94. 5 3 DA. 
Fructifications coriaceous-corky, usually resupinate and 
effused, with a narrow, free, marginal portion, or sometimes 
reflexed, silky at first and pinkish buff, at 
pl. 4. 
length concentrically furrowed, radially NSW Nu 
pitted and weathering gray, the margin INN SAN A 
thick, entire; hymenium dull, pruinose, aN oe 
drying pinkish buff to drab-gray, when Ws NY 
fresh bleeding where wounded; in struc- SSS 
ture 500-1800 y thick, with the interme- 
diate layer bordered on the upper side by 
a dense golden zone and on the lower side 
by a two- to many-zoned hymenial layer 
120-1200 y thick, hyphae of intermediate 
layer 21-3 y, in diameter; dark-colored 
conducting organs very numerous, 3-6 u 
in diameter; no cystidia; spores hyaline, 
even, flattened on one side, 7-10X3-4 u. 
SSS <> 
(gna Y 
Fig. 19. S. rugosum. 
Section X 19; interme- 
diate layer, i; dense 
golden zone, z; the scat- 
tered darker lines in 
hymenial zones show 
distribution of conduct- 
ing organs. 
Resupinate on areas 2-6 cm. in diameter; free or reflexed 
margin 2-12 mm. broad. 
On stumps of Alnus, Corylus, Quercus, Betula, and other fron- 
dose species. 
tains of North Carolina. 
America, common in Europe. 
Newfoundland, Ontario, New York, and moun- 
July to October. 
Rare in North 
Although usually resupinate and likely to be regarded as a 
Corticium by collectors, 
nevertheless sectional preparations 
show the highly developed characteristic structure of a Stereum, 
with intermediate layer of longitudinally arranged hyphae, 
golden crust, etc. 
The bleeding of the hymenium and the abun- 
dant colored conducting organs locate the species among the 
Stereums in the group with S. gausapatum, S. australe, and S. 
