1920]. 



BURT — THELEPHORACEAE OF NORTH AMERICA. XII 



225 



Fig. 45. S. insigne. Sec- 

 tion of hjanenium of authen- 

 tic specimen X 665; bottle- 

 brush paraphyses, p. 



19768, 19873, 19881 (in Mo. Bot. Card. Herb., 9143, 8964, 

 5920). 



74. S. insigne Bresadola, Nuov. Gior. Bot. Ital. 23: 158.. 

 1891; Sacc. Syll. Fung. 9: 222. 1891. Plate 6, fig. 74. 



Type: authentic specimen, probably part of the type, in Burt 

 Herb. 



Fructification corky, drying rigid, hard, efi'uso-reflexed, the^ 

 upper surface concentrically sulcate, somewhat zonate, tomen-- 

 tose, snuff-brown to bister, the recent 

 growth at the margin paler; hymenium 

 even, pinkish buff to drab-gray and 

 pruinose; in structure 1500 m thick, 

 with the intermediate layer bordered 

 and connected with the tomentum by 

 a darker and denser zone and bearing 

 on the opposite side a multizonate 

 hymenium; hyphae of the intermediate 

 layer colored, thick-walled, densely 

 and longitudinally arranged, 3| ^ in 

 diameter; no cystidia; paraphyses of 



bottle-brush or aculeate form, numerous and conspicuous in the 

 hymenial surface, cylindric, 25-30 X4-4| m; spores published by 

 Bresadola as hyaline, even, 4-6X3-3^ m — none found by me. 



Reflexed 1^-4 cm., laterally confluent for 9 cm. in the Florida 

 specimen. 



On oak logs. Florida, Venezuela, and Italy. February. Rare. 



This species belongs in the group with S. suhpileatum and S. 

 septum and is not distinguishable in general aspect from these 

 species, but its hymenium contains numerous and conspicuous 

 bottle-brush paraphyses and no cystidia, while both of the other 

 species named have cystidia. The Venezuelan specimen cited 

 below was determined by Berkeley as Stereum illudens, from 

 which it appears distinct, for while the type of S. illudens, in 

 Kew Herbarium, collected by Drummond, 158, Swan River, 

 Australia, has bottle-brush paraphyses for its hymenial surface, 

 it has in its subhymenium elongated, cylindric, thick-walled 

 organs 6 ^ in diameter, up to 100 ii long, a little darker colored 

 than the surrounding hyphae and curving outward into the 

 deeper portion of the hymenium, which is not zonate. 

 10 



