522 



Conidia (Melanconium, sp.) one- or more-celled, variously shaped, not 

 superficial, for the most part dark-colored. (Winter in Die Pilze). 



* S])oridia hyaline. 

 M. stilbostoma, (Fr.) 



Sphceria stilbostoma, Fr. a, S. M. II, p. 403. 

 Valsa stilbostoma, Fr. Surama, p. 412. 

 Melanconis stilbostoma, Tul. Sel. Carp. II, p. 119. 

 Sphczria pulchttla, Currey, Linn. Trans. XXII, p. 28c?. 

 Exsicc. Fckl.F. Rh. 590. Rab. F. F. 933- Rehm Asc. 675. 



Stromata scattered, oblong or subelliptical at base, depressed- 

 globose, or hemispherical, 2-3 mm. diam., permanently covered by the 

 pustuliform-elevated epidermis, which is barely pierced by the erum-. 

 pent, whitish disk surrounded by a slight depression. Perithecia 3-12 

 in a stroma, surrounded and partly covered by a granular-pulverulent, 

 yellowish material; sunk in the surface of the inner bark, but so 

 slightly that, when the epidermis is peeled off, they often adhere to it- 

 black, small, depressed and collapsing when dry, with converging, 

 cylindrical necks bent upwards at their extremities and piercing the 

 disk with their globose or short-cylindrical, black, perforated, slightly 

 projecting ostiola. Asci cylindrical, substipitate, 8-spored, 90-110 x 

 12-16 /i. Sporidia subbiseriate, elliptical or oblong, straight, obtuse, 

 hyaline, uniseptate and constricted, 18-25 x 7-9 /i. Conidial stroma r 

 Melanconium bicolor, Nees., subcuticular, conical, producing numer- 

 ous brown, continuous, ovate conidia, 13-16 x 710 /i. 



On dead limbs of birch, Acer and Melia, Carolina and Pennsyl- 

 vania (Schw. & Ravenel), on birch, New York and Iowa (Peck & 

 Holway). 



M. bitorulosa, (B. & Br.) 



Valsa bitorulosa, B. & Br. Not. Brit. Fungi r No. 861 in Ann. & Mag. 1859, III, tab 



X, fig. 16. 

 Cryptospora bitorulosa, Niessl, in Rab. F. Fur. No. 2243, 

 Diaporthe bitorulosa, Sacc. Syll. 2355. 

 Fxsicc. Rab. F. F. 2243, 2421. Cke. F. Brit. Ser. II r 249. Sydow, M. March. 263. 



Perithecia circinate, 8 or more together covered by the slightly 

 raised epidermis, globose, more or less collapsing, \ mm. diam., sub- 

 pulverulent, with straight, horizontal necks converging to the center, 

 where their extremities are confluent and erumpent in a small, black 

 disk. Asci clavate, p. sp. 65-75 x 12-15 p.. Sporidia biseriate, uni- 

 septate, oblong-fusoid, 15-19x4-5 //, hyaline. 



On dead limbs of Carpinus Americana and Ostrya Virginica 

 Iowa (Holway). 



