IQ20] 



STEVENS— PORTO RICAN FUNGI 



249 



numerous, 65X14/^ cylindrical, 4-spored. Paraphyses few, incon- 

 spicuous, fine, filamentous. Spores hyaline, 2-celled, oblong, 



17-20X4^5 M- . 



On Pteridium caudatum, Maricao, 4814 (type), 167. 



This fungus agrees somewhat closely with Dothidella pteridophila Speg., 

 but differs essentially in that it has paraphyses, and the asci are 4-spored. 

 It differs from Uleodothis, as described, in having 4-spored asci, but it does 

 not seem w r ise to found a new genus merely on this character. 



linea 



* co- 

 Fig. 1. — Structure of stroma and arrangement of locules 



Dothidella portoricensis, sp. nov. (figs. 8, o; text fig. 1).— Spots 



, amphieenous, definite. Stromata linear, 



o-5 



mm 



entirely occupying the spots, raised above the leaf surface about 

 70 tx. Perithecial cavities in about 5 rows, nearly globular, about 

 70 m in diameter. Paraphyses none. Asci numerous, cylindrical, 

 54Xio/z, 8-spored. Spores hyaline to dilute smoky, i-septate, 



