92 



The species is common in Europe, and appears also to be widely 

 diffused in this country. It is reported from Carolina to Pennsylvania 

 and Iowa, and from Northern New York and Canada* 



THYRONECTRIA, Sacc. 



Grev. IV, p. 21, and Mich. I, p. 325. 



Stroma valsiform or linear, covered by the bark and only partially 

 erumpent. Perithecia monostichous, subcarnose, reddish, but covered 

 with a yellow-furfuraceous coat, except the short ostiola. Asci 8-spored, 

 paraphysate. Sporidia oblong, muriform, hyaline or subhyaline, or 

 at least in one American species, brown. 



Th. Xanthoxyli, (Pk.) 



Valsa Xantkoxyli, Pk. 31st Rep. p. 49. 

 Fenestella Xanthoxyli, Sacc. Syll. II, p. 332. 



Pustules slightly prominent, with a yellowish-furfuraceous, lanceo- 

 late disk, which is dotted by the black ostiola. Perithecia 2-15 in a 

 stroma, rarely single, fragile, pale outside, reddish inside, small (about 

 \ mm.), subcircinate, enclosed in the slightly altered substance of the 

 bark, with a tawny-yellowish, floccose-tomentose substance surrounding 

 them and filling the spaces between them, attenuated above into slen- 

 der necks, with the short, black, obtuse, papilliform, then narrowly 

 perforated ostiola erumpent in the light, sulphur-yellow, elongated 

 disk which bursts through longitudinal cracks in the bark, but does 

 not rise above it. Asci oblong-clavate, p. sp. 65-75 x 12-15 jul, sub- 

 sessile, paraphysate, 8-spored. Sporidia biseriate, yellowish, oblong- 

 cylindrical, obtuse, slightly curved, faintly 3-5-septate and muriform, 

 18-22x6-9 fi. The septa are very faint, and in many cases scarcely 

 visible. The ostiola are at first covered with a greenish-yellow powder. 



On dead limbs of Xanthoxylum Americanum, Troy, N. Y. (Peck). 



This is very near Th. Patavina, Sacc, but seems to differ in its 

 5-septate sporidia and ostiola united in a disk. 



Th. virens, Hark, (in Herb.) 



Perithecia cespitose, seated on the surface of the inner bark, 

 bursting through and surrounded by the upturned epidermis, in com- 

 pact clusters of 5-12, globose, J mm. diam., clothed with a dense, 

 greenish-yellow, tomentose-furfuraceous coat. Ostiolum papilliform, 

 black, tardily appearing. Asci clavate-cylindrical, 100-110 (p. sp. 70- 

 75) x 12-15 fi] paraphyses evanescent. Sporidia biseriate, oblong- 

 cylindrical, obtuse, curved, hyaline, 6-7 -septate and muriform, 18- 

 22 x 6-8 ix. 



