339 



PL piistulans, E. & E. Jonrn. Mycol. IV, p. 76. 



Perithecia gregarious, membranaceous, ovate-globose, |-| mm. 

 diam., raising the bark into subcorneal pustules, with the papilliform 

 ostiola erumpent. Asci clavate-cylindrical, with a short-stipitate base, 

 about 100 x 12-15 /i., with abundant paraphyses. Sporidia uniseriate 

 or subbiseriate, varying from ovate to oblong, and oblong-elliptical, 

 18-20x8-10 p., at first pale brown and 3-4-septate, scarcely con- 

 stricted, with the ends subacute, soon 5-7-septate and darker, with the 

 ends obtuse, one or two of the cells divided by a longitudinal septum 

 which finally runs through all but the terminal cells, more or less 

 distinctly. 



On the exposed inner surface of bark of Fraxinus, Clyde, N. Y. 

 (0. F. Cook). 



This is very distinct from PL velata, Sacc. & Roum. in F. G. 1081 , 

 in its much larger perithecia, which are not flattened, and in its mostly 

 longer, 3-7-septate, sporidia. Dr. Berlese, in his monograph of Pleos- 

 pora, figures PL Saccardiana (of which he gives PL velata as a syn.) 

 with 4-septate sporidia, though he says the normal number is three, as 

 we find them in our copy of Fungi Gallici. 



PL vulgaris, Niessl. Notiz. p. 27. 



Kxsicc. Rab. F. F. 824, 1545, 3146. I,in. Fungi Hung. 275. M. March, 1924, 2037, 2542, 

 2545. F. Gall. 5251. 



Perithecia scattered, covered by the epidermis, depressed-spheri- 

 cal, with a flattened base, soon collapsing, small (250 p), glabrous 

 except the slightly fibrillose base, dark brown, thin-coriaceous, with a 

 papilliform ostiolum. Asci clavate or clavate-cylindrical, 8-spored, 

 stipitate, 80-140 x 10-15 p. Sporidia uniseriate or biseriate, obtusely 

 rounded at the ends, subinequilateral, 5-septate and constricted at the 

 septa, more decidedly so at the middle septum, the four middle cells 

 divided by a longitudinal septum, yellow, becoming brown, 15-21 x 

 8-10 p. Paraphyses jointed, simple or sparingly branched, longer 

 than the asci. 



On dead stems of Verbascum Thapsus, Newfield, N. J., on stems 

 of Nepeta Cataria, London, Canada, and on Potentilla, Artemisia 

 and Pedicularis, Greenland. Smaller throughout than PL herbarum. 



PL Cassise, E. & E. Journ. Mycol. II, p. 41. Berl. Mon. Pleosp. 

 p. 152. 



Perithecia scattered, J mm. diam., co vered by the epidermis which 

 is raised in a pustuliform manner, but not blackened over them, and 

 barely pierced by the papilliform ostiola. Asci subejdindrical. 



