1920] 
BURT—THELEPHORACEAE OF NORTH AMERICA. XII 227 
76. S.frustulosum (Pers.) Fries, Epicr.552. 1838; Hym. Eur. 
643. 1874; Morgan, Cincinnati Soc. Nat. Hist. Jour. 10: 196. 
1888; Sacc. Syll. Fung. 6: 572. 1888; Massee, Linn. Soc. Bot. 
Jour. 27: 199. 1890. Plate 6, fig. 76. 
Thelephora frustulosa Persoon, Syn. Fung. 577. 1801; Myc. 
Eur. 1: 134. 1822; Fries, Syst. Myc. 1: 445. 1821.—Thele- 
phora perdix Hartig, Zersetzung. des Holzes, 103-108. pl. 13. 
1878 
Illustrations: Cooke, Fung. Pests, pl. 20. f. 20; Hartig, loc. 
cit.; Massee, Dis. Cult. Plants, 397. text f. 124; Tubeuf, Dis. 
of Plants, 35. text f.11,and 430. text f. 260, 261. 
Fructifications woody, resupinate, tuberculose, crowded as if 
confluent and then broken up into frustules, sometimes grown 
outward from place of attachment and narrowly reflexed or 
with a free margin all around, the upper side black, crust-like, 
POT 
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NS NW 
SS NIRO AM 
SN v 
un ww YU | 
¡es 
Fig. 47. S. frustulosum. Section X 45; bottle-brush paraphyses, p, X 665. 
concentrically suleate, glabrous; hymenium convex, pinkish 
buff to whitish and pruinose; in structure 800 y or more thick, 
with hyphae densely arranged, radiating outward from the 
place of attachment and bearing a multizonate hymenium in 
which are great numbers of bottle-brush or aculeate paraphyses; 
spores hyaline, even, 5-6 X 3-33 y. 
Fructifications 2-4 mm. in diameter; margin reflexed 3 mm. 
in the best developed specimen known to me. 
On wood of oak logs and stumps in which it causes a pocketed 
or honey-comb rot. Canada to Texas and westward to Oregon, 
in Mexico and in Europe. 
S. frustulosum may be recognized by its occurrence in small 
convex fructifieations of woody consistency, crowded together 
