1920] 



BURT THELEPHORACEAE OF NORTH AMERICA. XII 



121 



Thelephora rufum Fries, Elenchus Fung, i : 187. 1828. 

 Cryptochaete rufa (Fries) Karsten, Finska Vet.-Soc. Bidrag 

 Natur och Folk 48: 408. 1889. Tubercularia pezizoidea 

 Schweinitz, Am. Phil. Soc. Trans. N. S. 4:301. 1832; Sacc. 

 Syll. Fung. 4: 644. 1886. Hypocrea Richardsonii Berkeley 

 & Montagne, Grevillea 4: 14. 1875; Sacc. Syll. Fung. 2: 528. 

 1883; Ellis & Everhart, N. Am. Pyrenomycetes, 86. 1892. 

 Corticium pezizoideum (Schw.) von Schrenk, Torr. Bot. Club 

 Bui. 21 : 385. pi 218. 1894. 



Illustrations: von Schrenk, Torr. Bot. Club Bui. 21: pi. 218. 

 1894. 



Type: in Herb. Fries. 



Fructifications scattered or gregarious, coriaceous-fleshy, 

 bursting out from the bark, verruciform, plicate-tuberculose, 



<mMZc 



Fig. 11. S. rufum. Fructifications, /; section of fructification, m; section of 

 hymenial region, n; spores, s. After von Schrenk. 



peltate, vinaceous-brown to hematite-red, under side glabrous, 

 the margin free all around; hymenium becoming coarsely 

 wrinkled, vinaceous-brown, often grayish pruinose; in structure 

 1-2 mm. thick at the center, 600-800 n thick in the marginal 

 portion, composed of ascending, loosely interwoven, incrusted, 

 hyaline hyphae 4-4 /* in diameter over the incrustation; flexuous 

 gloeocystidia 50-90X7-10 m are scattered in or near the hymeni- 

 um but not protruding; spores white in spore collection, even, 

 curved, 6-8X1^-2 /u. 



Fructifications 2-4 mm. in diameter. 



On dead fallen Populus tremuloides. Newfoundland to Mass- 

 achusetts and westward to North Dakota and Colorado. 

 March to December. Common. Occurs in Scandinavia also. 



