18 ILLIKOIS BIOLOGICAL MONOGRAPHS [184 



PHVLLACHORINEAE 



Phyllachora Nits. 

 In Fuckel Symb. Myc, 216, 1869. 



11. Phyllachora aegiphilae Stevens, n. sp. 

 [Figure 35.] 



Spots minute, 1 to 2 mm., consisting of a pale halo around the usually 

 solitary stroma. Stroniata punctiform, rough and black above; appearing 

 only as raised places below, less than 1 mm. in diameter. Clypeus epi- 

 phyllous, epidermal. Stroma occupying the whole of the mesophyll with 

 a dense pseudo-parenchyma. Locules few, usually 1 to 4, 180 to 216;u in 

 diameter by 180;u deep. Asci 8-spored, 14 x 7.5/i; paraphyses filiform; 

 spores fusiform, hyaline, continuous, 17 to 25 x 4.5 to 5.5/i. 



On Aeglphila sp. 



British Guiana: Rockstone, July 17, 1922, 458. 



Five species of Phyllachora are given b}^ Theissen and Sydow as on 

 members of the Verbenaceae but all disagree essentially with the one de- 

 scribed above. The characteristic features are the epiphyllous, epidermal 

 clypeus and the absence of a hypophyllous one. The ostiole develops 

 through the clypeus i.e. on the upper surface. 



12. Phyllachora chaetochloae Stevens n. sp. 

 [Figures 36 to 38, 97.] 



Stromata black, shining, conspicuous from above, rarely visible below. 

 Arranged in longitudinal groups from 3 to 12 cm. long. Single stromata 

 small, punctiform but by coalesence often 1 x 10 mm. in size. Locules num- 

 erous, globular (about 125/^ in diameter) or flattened (310yu in diameter, 110/i 

 thick), ostiolate, occupying the palisade region and upper portion of the 

 mesophyll. Clypeus on the upper surface thick (45 to 60^), epider- 

 mal. Asci 108 X 14;u, spores inordinate, oblong, continuous, hyaline, 7 x 14 

 to 18;u. Conidia are very commonly produced in young portions of the 

 ascigerous stroma, in ostiolate, clypeate, locules like those bearing asci. 

 Conidia cylinderical, hyaline, obtuse, straight or slightly crooked, guttulate, 

 continuous or 1-septate, 12.5 to 23 x 2 to 3.6;u ' Filiform conidia pro- 

 duced as are the cylindrical. Conidia 22 to 29 x lyu, hyaline, usually flex- 

 uose, sometimes straight, usually slightly larger at one end than at the other. 



On Chaetochloa lenaxJ 



Trinidad: Cumuto, August 15, 1922, fiSZ. 



No Phyllachora is given as on Chaetochloa by Theissen and Sydow; two 

 are given as on Setaria both of which agree reasonably well in spore shape 

 and size with our species, but disagree essentially with them in stroma 

 characters and conidial forms. 



' Determined by Mrs. Agnes Chase. 



