305 



P. polaris, Rostr. Fungi Greenland, p. 548. 



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

 6-8 Jul. Sporidia elongated, guttulate, 10-12 x 2 /i. 



On dried up stems of Papaver nudicaule, Kangerdlugsuak, 

 Greenland. 



P. PotentillsB, Rostr. 1. c. 



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

 fasciculate, 32-34 x 8-9 //. Sporidia elongated, guttulate, 10 x 1-2 p.. 



On dry stems and petioles of Potentilla maculata, Upernivik, 

 Greenland . 



P. megastoma, (Pk.) 



Spharella megastoma, Pk. Bot. Gaz. IV, p. 231. 

 Physalospora megastoma, Sacc. Syll. 1669. 

 La stadia megastoma, 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 jm, paraphysate. Spo- 

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

 greenish-yellow, 10-15x6-7 ju. 



On living or languishing leaves of Astragalus bisulcatus, 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, 15x6 //. 



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



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



Perithecia J-^ 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 



