634 



H. bicolor, E. & E. Jcrara. Mycol. II, p. 88. 



Stroma tubercular-hemispherical, about 2 mm. across, scattered, 

 somewhat uneven from the slightly prominent perithecia, dull ferru- 

 ginous-purple, becoming- darker within, yellow, becoming darker with 

 age. Ostiola impressed, punctiform. Perithecia subperipherical, closely 

 packed, about \ mm. diam. Asci narrow-cylindrical, with a slender 

 base, about 100 x 6 p. Sporidia in a single series, narrow-elliptical or 

 subnavicular, pale yellowish at first, then opake, 1-2-nueleate, 9-12 x 

 3 \-A | p, ends subacute. 



On dead limbs of Quercus virens, Pointe a la Hache, La. (Lang- 

 lois). 



Allied to IT. fuscum, but differs in its impressed ostiola and 

 smaller stroma yellow inside. Sec. Cooke, in Grev. XI, p. 127, 

 Hypoxylon bicolor, B. & C, is a Diatrype. 



** Stroma externally black. 

 H. multiforme, Fr. Summa Veg. Scand. p. 384. 



Sphczria multiformis, Fr. S. M. II, p. 334. 

 Sphczria peltata, DC. Flore Fr. II, p. 287. 

 Hypoxylon granulosum, Bull. Champ, p. 176, tab. 487, fig. 2. 

 Sphczria rubiformis, Pers. Syn. p. 9. 

 Kxsicc. Fckl. F. Rh. 1052. Rab. F. F. 919. Thutn. M. U. 1660, 2174. Kll. N. A. F. 575. 

 Desm. Pi. Cr. Ed. I, 1251. L,in. F. Hung. 181. Sydow, M. March. 1451, 2954. 



Stroma erumpent and often margined by the ruptured bark, of 

 various shapes, but on birch usually transversely elongated, oblong or 

 elliptical, somewhat flattened above, 1-1 J cm. long by -f cm. wide, 

 or by confluence 4 or more cm. long, dull rusty-red at first, finally 

 black and smooth. Perithecia irregularly monostichous, rather large, 

 globose, distinctly prominent, with papilliform ostiola. Conidial layer 

 dirty yellowish, becoming darker, conidia very small, obovate. Asci 

 cylindrical, on long pedicels, spore-bearing part 70-90 x 6 p. Par- 

 aphyses slender, simple, longer than the asci. Sporidia uniseriate, 

 inequilateral-oblong, pale brown, 9-10 J x 3 J p (10-12 x4-5 p, Sacc). 



On dead birch, New Hampshire (Farlow), New York (O. F. 

 Cook), Michigan (Miss Minns), Minnesota (Holway), Canada (Macoun). 

 Alnus, Sorbus, Quercus, and Gastanea are also given as habitats of 

 this species. 



Specimens on Alnus, sent from British Columbia by Dr. Macoun, 

 have the stroma depressed-hemispherical, 1-| cm. across, and the peri- 

 thecia less prominent, but the asci and sporidia are the same. This is 

 a widely-diffused species, being found throughout Europe, also in 

 Kamtschatka and the elevated region of Nepal in Central Asia. Its 

 range appears to be northward. It is generally found on limbs from 



