ILLINOIS BIOLOGICAL MONOGRAPHS |176 



POLYSTOMELLACKAE 



parmulineae 

 Hysterostomina Theiss. and Syd. 

 Ann. Myc, 13:228, 1915 



1. Hysterostomina palmae Stevens n. sp. 



[Figures 1 to 4] 



Spots discolored, yellowed, showing from both leaf sides, bordering the 

 stromata by a band several millimeters wide. Stromata radiate, epiphyl- 

 lous, roughly circular, nearly entire, black, 2 to 4 mm. in diameter, 

 superficial, but firmly attached. No free mycelium. Hypothecium well de- 

 veloped, extending deep into the mesophyll, brown, attached to the strom- 

 ata by the whole of its base. Perithecia linear, irregularly arranged, 460/1 

 in length, about 180m wide, 110 to 145m deep. Cleft 70 to 90m wide, covering 

 layer 18 to 25m thick. Asci 8-spored, numerous; spores dark, 1-septate, 

 18 to 21 X 7m, one cell darker and slightly larger than the other. Asci 

 43 to 45 X 18m, thickened at the apex. Paraphyses numerous, filiform. 



On Palm. 



British Guiana: Tumatumari, July 12, 1922, 199. 



DOTHIDEACEAE 



COCCOIDEAE 



CoccosTROMOPSis Plunkett n. gen. 

 Stroma prosenchymatic, without a definite covering layer, centrally 

 attached, dothideoid. Loculi immersed, oval to spherical, equally dis- 

 tributed; asci clavate, 8-spored, paraphysate; spores continuous, elliptical, 

 hyaline. 



2. CoccosTROUOPSis PALMiGENA Plunkett n. sp. 



[Figures 5, 6] 

 Stroma superficial, raised m irregular tubercles, brownish black, formed 

 of perpendicular hyphae and attached by a central foot which penetrates 

 into the mesophyll. Loculi sunken, oval to spherical, ostiolate, large, 

 250 to 400m in diameter, without a wall; asci clavate, slightly stalked, 

 8-spored, arising basally and laterally in the loculi; 72 to 90; x 14 

 to 18m; paraphyses hyalme, thin, filiform, 50 to 100 x 1.5 to 2m; spores 

 continuous, elliptical, hyaline, granular, inordinate, 18 to 21 x 5 to In. 



