)2 



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

 liffused in this country. It is i-eported from Carolina to Pennsylvania 

 md 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 

 irumpent. Perithecia monostichous, subcarnose, reddish, but covered 

 vith a yellow-iiirfuraceous coat, except the short ostiola. Asci 8-spored, 

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

 it least in one American species, brown. 



Th. Xanth6xyli, (Pk.) 



yalsa Xanthoxyli^ Pk. 31st Rep. p. 49. 

 Fenestella Xanlhoxyli, Sacc. Syll. I-t, p. 332. 



Pustules slightly prominent, with a yellowish-furfuraceons, 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 

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

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

 ler 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 /i, sub- 

 5eesile, paraphysate, 8-spored. Sporidia biseriate, yellowish, oblong- 

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

 18-22x6-9 IX. 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, \ mm. diam., clothed with a den^e, 

 i-reenish-yellow, tomentose-furfuraceous coat. Ostiolum papilliform, 

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

 ( 5) X 12-15 fx; paraphyses evanescent. Sporidia biseriate, oblong- 

 •j'lindrical, obtuse, curved, hyaline, 6-7-septate and muriform, 18- 

 22 X 6-8 iJL. 



