28 ILLINOIS BIOLOGICAL MONOGRAPHS [496 



On Chiococca alba (L.) Hitch. Fig. 26. 



Vega Baja, July 2, '15, 7743 (type). Hormigueros, June 23, '15, 



7325. ■ 



30. Meliola pteridicola sp. nov. 



Colonies amphigenous, mainly epipyllous, 1-6 mm. in diam. Myce- 

 lium forming a loose network of threads which show a marked tendency 

 to be rectilinear and to branch at right angles, quite dark, septation 

 obscure. 



Capitate hyphopodia alternate or irregular, not crowded, about 

 30/A apart, ovoid or pyriform, 17 x 3/a, apex thickened, the basal cell 

 very short. Mueronate hyphopodia few and scattered or abundant on 

 certain threads, alternate or opposite, small, bottle-shaped, the neck 

 narrow, 16-18/x long x Ifx wide. Mycelial setae none. Perithecial setae 

 few, about 3-10, 90 x T^u, dark, straight, or slightly curved at tip. Tip 

 obtuse. ' 



Perithecia 170/x., rough, with rounded protuberances of small, 6-10/x, 

 subprominent cells, ostiole none. Asci soon evanescent; ascospores 4- 

 septate, brown, very slightly constricted, obtuse, 35-40 x 4|U,. 



On Aneimia adiantifolia (L.) Sw. Fig. 27. 



Rio Tanama, near Arecibo, July 6, 7814 (type). Quebradillas, 

 June 23, 7269. Dos Bocas, below Utuado, July 8, 8015. 



On Aneimia sp. Dos Bocas, below Utuado, Dec. 30, '13, 6594. 



On Adiantum latifolium Lam. 



Las Marias, July 10, 8182. Mayaguez, June 24, 7418. 



On Adiantum sp. aff. A. cristatum. 

 Mayaguez 3, July 19, 8795. 



On Adiantum sp. 



Mayaguez, May 1, '13, 1063. 



This species is very abundant, forming dense dark patches upon 

 the leaves and petioles though no signs of injury to the host are evi- 

 dent. The fungus falls within the group characterized by perithecial 

 setae, but no mycelial setae, a group with but few representatives, none 

 of which can be confounded with this. The chief, distinctive character 

 is the parallel coursing of the mycelium. The colonies are usually 

 densely parasitized by Helminthosporium, Podosporium, or Asterina, 

 each giving its characteristic effect to the colony. The occurrence of both 

 Helminthosporium and Podosporium upon this Meliola presents a strong 

 argument as to the parasitic nature of these forms rather than their be- 

 ing a stage in the development of the Meliola itself. 



