1915] 



BURT THELEPHORACEAE OF NORTH AMERICA. V 759 



6. S. macrospora (E. & E.) Burt, n. comb. 



Corticium macrosporum Ell. & Ev., Torr. Bot. Club Bui. 

 27:49. 1900. 



Type : in N. Y. Bot. Gard. Herb. ; specimens from type col- 

 lection in Lloyd Herb., and in Burt Herb. 



Fructification coriaceous, appressed, thin, dull white, 

 cracked, the narrow, white, cottony margin sometimes nar- 

 rowly involute ; structure in section, 300-400 n thick, with ( 1 ) 

 a very broad layer of longitudinally arranged and somewhat 

 obliquely ascending crowded hyphae 1* ju in diameter, color- 

 less next to substratum but brownish in upper part of layer, 

 which pass into (2) the hymenial layer 60-100 n thick, con- 

 sisting of erect, bushy paraphyses and of basidia; basidia 

 longitudinally septate, pyrif orm to subglobose, 15 X 9-12 n ; 

 spores colorless, simple, flattened on one side or curved, 

 10* X 4^-6 M . 



Appearing at first in orbicular patches 3-5 mm. in diameter, 

 at length confluent and up to 4 cm. long, 1| cm. broad. 



On pine (Pinus Strobus) limbs. Ohio. September. 



This species is near Sebacina calcea, but the single collec- 

 tion which has been studied seems distinct from the latter by 

 the thick, determinate margin, sometimes free and slightly 

 upturned, by the greater thickness of the fructifications, by 

 the brown hyphae of the middle region, and by walls of 

 hyphae not gelatinously modified as in 8. calcea. A relation- 

 ship to Eichleriella is manifest in the broad layer of longi- 

 tudinally arranged hyphae and in the tendency of the margin 

 to be slightly free. The original description gives this species 

 as on "Fraxinusf", but the limbs are Pinus strobus. The 

 spores are not exceptionally large; the specific name was 

 probably based on immature basidia. 



Specimens examined. 

 Ohio : Linwood, C. G. Lloyd, 3113, type collection. 



7. S. calcea (Pers.) Bresadola, Fungi Tridentini 2: 64. pi. 



175. 1892. Plate 27, fig. 17. 



Thelephora calcea Persoon, Syn. Fung. 581. 1801; Myc. 



Eur. 1:153. 1822. — Thelephora calcea c. albido-fuscescens 



