70 



Mycologia 



Technical Description 



There does not appear to be any described genus to which this 

 fungus can be unreservedly referred. The structure of the stroma 

 and of the perithecium places it among the Dothidiaceae. In 

 many respects it resembles Plowrightia, and were it not for the 

 fact that the spores are unicellular there would be little objec- 

 tion to assigning it to that genus. However, the spores de- 

 scribed above are of undoubted maturity and such a classification 

 is therefore untenable. 



It appears to more nearly agree with Bagniesiella than any 

 other described genus and probably does not differ from it suffi- 

 ciently to warrant the founding of a new genus. The shape of 

 the spores is perhaps the most important feature which differs. 

 In B. australis the spores are elliptical with obtuse ends and sub- 

 inequilateral and are therefore not markedly different from the 

 spores herein described. 



Bagniesiella Diantherae sp. nov. 



Stroma erumpent, pulvinate, linear, lo to 30 mm. in length by 

 2 to 4 mm. in diameter, black, smooth at first, becoming roughened 

 and tuberculate with age. Conidial stage appearing before the 

 ascigerous and borne on the same stroma. Conidiophores 

 branched, packed closely together, conidiospores hyaline, oval, 

 unicellular, 10-15 X 3/^- Perithecia numerous, subglobose to 

 elongate, immersed in the stroma, 475-550 X 300-350/x. Necks 

 elongate, ostiolate. Asci clavate, 5o-65/>(, X io-15/x, without pa- 

 raphyses, 8-spored. Ascospores biseriate, hyaline, continuous al- 

 lantoid, 6-9 X 



On living stems of Dianthera americana at Austin, Texas. 



In conclusion, the writer wishes to acknowledge his indebted- 

 ness to Mrs. Flora W. Patterson for her opinion as to the rela- 

 tionship of the fungus. 



University of Texas, 

 Austin, Texas. 



