1890.] NATURAL SCIENCES OP PHILADELPHIA. 233 



Venturia parasitica, 



Parasitic on old Hy poxy Ion {perforatum) f On bark of Magnolia 

 near St. Martinsville, La., Jan., 1889. Langlois, 1781. Perithecia 

 densely gregarious, globose, 90-100 //. diam. collapsing above, 

 sparingly clothed with spreading straight rigid continuous spines or 

 bristles about 30 x 5 /v.. Asci clavate-cylindrical about 25 x 5 //. 

 without any paraphyses. Sporidia oblique or (biseriate) oblong, 3- 

 4-nucleate, hyaline, 6-8 x 2 ,a. 



Venturia sabalicola. 



On dead leaves of Sahal palmetto, Bayou Chene, La., Oct., 1888. 

 Langlois, 1546. Scattered or subgregarious. Perithecia globose, 

 125-135 ,a. diam. pierced above, beset with stout straight black 

 bristles 50-80 x 6-8 p.. Asci oblong-clavate 50-60 x 7-8 ji. with- 

 out paraphyses. Sporidia fusoid-oblong, hyaline, 4-nucleate (be- 

 coming 1-septate) ? 10-13 x 22-3 //. crowded biseriate. 



Diaporthe columbiensis. 



On dead limbs of some undetermined tree, British Columbia, 

 April, 1889. Macoun, 32. Perithecia in subcircinate clusters of 3 

 -6 (occasionally only one) buried in the inner bark, their bases pen- 

 etrating to the subjacent wood, large (f-1 mm.) collapsing below, 

 abruptly contracted above into a short neck terminating in a sub- 

 tuberc'ular, quadrisulcate-cleft ostiolum erumpent (but not strongly 

 prominent) through the thin, black, superficial convex crust that 

 covers the stroma. The substance of the stroma consists entirely 

 (except the black circumscribing layer) of the bleached substance 

 of the bark. Stroma elliptical, 2-5 mm. diam. with a distinct black 

 circumscribing line which does not penetrate deeply into the wood. 

 Asci oblong-lanceolate, about 100 x 12 ,a. Sporidia biseriate, hya- 

 line, oblong 20-22 x 7-8 //., 1-septate and constricted, each cell with 

 a large nucleus. 



Diaporthe (Euporthej leucosarca. 



On dead limbs of Carpinus Americana, London, Canada, May, 

 1890. Dearness, 1696. Perithecia thickly scattered, buried in the 

 unchanged substance of the inner bark and covered by the gray 

 epidermis which is raised in a pustuliform manner and pierced by 

 the minute papilliform ostiola. Asci oblong-cylindrical, 80-110 

 X 20-22 ,a. (without paraphyses) ? Sporidia biseriate, broad-fusoid, 

 hyaline, 1-septate and constricted, each cell with a large nucleus, 22 



