488 



of the stroma, small, mostly not over ^ nun. diam., necks converging, 

 their short, black, rounded, then unibilicatc and open ostiola soon 

 obliterating the disk, except a faint white ring around the margin. but 

 not usually much exserted. Asci clavate. subsessilc, 25-30x5 //. 

 Sporidia biscriate, allantoid,' not strongly curved, hyaline, 6-8 x 1J- 

 1J fi, (10 /, Berk; 10-12 /;, Cke.). 



On hickory saplings killed by fire, New-field, N. J., on branches 

 of Ca rya, Pennsylvania (Michener), New York (Cook). 



Var. chlorodisca (Valsa Morodisca, C. & E., Grev. VIII, p. 13) 

 differs only in the yellowish disk. On the same limbs are pustules 

 of the normal sort. V. caryigena and V. pro&stans are closely allied. 



V. orbicula, B. & C. Grev. IV, p. 100, Cke. Valsei U. S. No. 38. 



Minute, orbicular, showing the subjacent perithecia by trans- 

 parence, but not blackened, surrounded by a black line. Asci lanceo- 

 late. Sporidia sausage-shaped, 10 p. long. 



On willow, South Carolina, No. 3404." 



V. collicnlus, (Wormsk.) 



Sphczria colliculus, Wormsk. Er. S. M. II, p, 389. 

 Valsa colliculus, Wormsk. Cke. Valsei U. S. No. 23. 

 Exsicc. EH. & Evrht. N. A. F. 2d Ser. 1577. 







Pustules prominent, convex-hemispherical, 2-3 mm. diam., closely 

 covered by the cinereous epidermis, and uneven from the projecting 

 perithecia which (10-20 in number) are closely packed within and 

 covered by a scanty stroma formed from the scarcely altered substance 

 of the bark, about \ mm. diam., with short, convergent necks, and the 

 minute, papilliform, black ostiola crowded and erumpent, but scarcely 

 exserted. Asci slender-clavate, 35-40 x 3 /jt. Sporidia subbiseriate, 

 allantoid, hyaline, 5-6 x 1| JJL. 



On dead limits of Pinus strobus, New York, New England and 

 Pennsylvania. 



EUTYPELLA. Nits. 



Pyr. Germ. p. 163, Sacc. Syll. I, p. 145. 



Stroma valsoid, immersed in the wood or bark, and surrounded 

 by a black, circumscribing line. Perithecia in one or several layers, 

 never simply circinate, with rather thick, subcoriaceous walls, black 

 and shining inside when mature. Ostiola stellate-cleft. Asci lonu- 

 stipitate, 8-spored. Sporidia allantoid, mostly yellowish-hyaline. 



The most obvious character separating this from Vaha is the 

 stellate-cleft ostiola. 



