305 

 P. polkris, Rostr. Fungi Groenland. p. 548. 



Perithecia scattered, Asci ovate-oblong, paraphysate, 35-40 x 

 6-8 [1. Sporidia elongated, guttulate, 10-12 x 2 //. 



On dried up stems of Papaver nudimule, Kangerdlugsuak, 

 Greenland. 



P. Potentillse, Rostr. 1. c. 



Perithecia scattered, globose. Asci ovate-oblong, paraphysate, 

 fasciculate, 32-34 x 8-9 p.. Sporidia elongated, guttulate, 10x1-2 fi. 



On dry stems and petioles of Potentilla maculata, Upernivik, 

 Greenland. 



P. me^astoma, (Pk.) 



SphiErella megasioma^ Pk. Bot. Gaz, rV, p. 231. 

 P/iysalospora m^astoma, Sacc. Syll. 1669. 

 LiBStadia tnegasioma^ Cke. Syn. 5273. 



Perithecia minute, numerous, amphigenous, at first covered by the 

 epidermis, then erumpent, black, with a large, circular opening at the 

 apex. Asci subcylindrical, 100-150x15-18 /i, paraphysate. Spo- 

 ridia uniseriate or crowded-biseriate, oblong-elliptical, granular, 

 greenish-yellow, 10-15x6-7 ;/. 



On living or languishing leaves of Astragalus bisulcatits, Colo- 

 rado (Jones), and on some leguminous plant (Astragalus), Valley City, 

 Dakota (Seymour). 



P. bina, Hark. Bull. Cal. Acad. Sci. No. I, p. 43. 



Epiphyllous, shining-black, hemispherical, half free, numerous, on 

 irregular, whitish spots, covering a third or more of the leaf and bor- 

 dered by a dark line. Asci fusoid, very delicate, 2-spored, attenuated 

 below to a slender pedicel, paraphysate. Sporidia oblong-elliptical or 

 slightly boat-shaped, rounded at one end and slightly pointed at the 

 other, with several vacuoles, 15 x 6 //. 



On living leaves of Quercus agrifolia, California (Harkness). 



P. quercifolia, E. & E. Journ. Mycol. I, p. 92. 



Perithecia |-| mm. diam., globose with a light colored nucleus, 

 buried in the substance of the leaf, but prominent, so as to show dis- 

 tinctly on both sides, covered by the epidermis which is slightly 

 blackened and closely adherent to the perithecia. Ostiolum papilli- 

 form, barely visible through the ruptured epidermis. The perithecia 

 finally collapse more or less distinctly. Asci oblong, 75-80x12//, 

 39 



