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. lo: 196. 

 1888; Sacc. Syll. Fung. 6: 572. 1888; Massee, Linn. Soc. Bot. 

 Jour. 27: 199. 1890. Plate 6, fig. 76. 



Thelephora frustulosa Fersoon, Syn. Fung. 577. 1801; Myc. 

 Eur. i: 134. 1822; Fries, Syst. Myc. i: 445. lS2l.— Thele- 

 phora perdix Hartig, Zersetzung. des Holzes, 103-108. pi. 13. 

 1878. 



Illustrations: Cooke, Fung. Pests, pi. 20. f. 20; Hartig, loc. 

 cit.; Massee, Dis. Cult. Plants, 397. text J. 124; Tubeuf, Dis. 

 of Plants, 35. text f.ll, 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, 



Fig. 47. S. frustulosum. Section X 45; bottle-brush paraphyses, p, X 665. 



concentrically sulcate, glabrous; hymenium convex, pinkish 

 buff to whitish and pruinose; in structure 800 ^ 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, 5-6X3-3^ /x. 



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 fructifications of woody consistency, crowded together 



