20 ILLINOIS BIOLOGICAL MONOGRAPHS (186 



the mesophyll, 125 to 170/u in diameter. Clypeus on both leaf surfaces but 

 much more extensive ajjove, about 18/u thick. Stroma of the mesophyll 

 region of a loose network of mycelium. Asci cylindrical with filiform 

 paraphyses. Spores uniseriate, hyaline, continuous, elliptical, 11 x 3.6/i. 

 On Paspalum virgatum. 

 British Guiana: Tumatumari, July 9, 1922, 32; July 10, 1922, 142: 

 Georgetown, Lamada canal, August 2, 1922, 712: Coverden, 

 August 4, 1922, 730. 

 This Phyllachora is distinguished from P. paspaUcola both by its thin 

 spore and by the character of its spot. 



17. Phyllachora paspalicola P. Henn. 



Hedw., 48:106, 1908. 



On Paspalum arenarum. 



British Guiana: Rockstone, July 16, 1922, 430. 



On Paspalum conjugatum. 



British Guiana: Rockstone, July 16, 1922, 419. 



The stromata in specimen No. 419 are chiefly on the laminae. 



Four species of Phyllachora are given by Theissen and Sydow as 

 occuring on Paspalum viz, P. acuminata Starb., P. injuscans Wint., 

 P. paspalicola P. Henn. and P. winkleri Syd. All but the last of these 

 were collected in South America. 



Specimen No. 430 agrees closely with P. paspalicola and differs marked- 

 ly from each of the others. The stromata occur chiefly on the leaf sheaths, 

 not on the blades. 



18. Phyllachora phaseoli (P. Henn.) Theiss. and Syd. 



Ann. Myc, 13:507, 1915. 



Physalospora phaseoli P. Henn. Hedw., 43:368, 1904. 

 Physalospora atroinquinans Rehm Hedw., 44:5, 1904. 

 Hyponectria phaseoli Stev. Bot. Gaz., 70:401, 1920. 

 On unknown Legume. 



British Guiana: Kartabo, July 21, 1922, 517. 



19. Phyllachora tabernaemontanae Stevens n. sp. 

 [Figures, 42, 43, 98.] 

 Stromata dull black, equally visable above and below, irregular in out- 

 line, large, 4 to 10mm., bearing numerous locules apparent externally from 

 both above and below as small mounds, occupymg the mesophyll with a 

 loose, black, net work covered above and below by clypei which extend 

 slightly beyond the stroma of the mesophyll. Locules flat, broad, 290 to 

 340/i, 90 to llO^u deep; wall about 70 to 80^;^ thick, black. Asci 8-spored, 90 



