i9°9] BRIEFER ARTICLES 



413 



Culture characters. — The fungus was grown upon many different media. 

 Its characters upon these media have been noted elsewhere. 7 



The most important culture characters may be summarized as follows: 

 • Upon media poor in available carbohydrates the mycelium was nearly 

 hyaline, and the hyphae and spores pale; upon media rich in carbohydrates 



hyph 



Upon the natural 



medium the spores were more regular and uniform in shape and were much 

 larger than upon artificial media. 



The species of fungus. — Of the Alternarias there seems to be only one, 

 A. longispora McAlph., growing upon members of the pink family (Caryo- 

 phyllaceae), 8 and the description of this does not agree with ours in size, 

 shape, or septation of its spores. 



form 



Macrosp 



a procedure which would be unjustifiable without resort to cross-culture 

 inoculations and extensive study in artificial media, this form had best be 

 designated as a distinct species, for which we propose the following name 

 and description: 



Alternaria Dianthi, n. sp. — Hyphae cespitose from stomata, amphige- 

 nous, dark brown, 1-4-septate, ascending, 1-25 from each stoma; conidia 

 26-123X10-20 p, catenulate, clavate, tapering, base obtuse, dark brown, 

 slightly constricted at the septa, transverse septa 5-9, longitudinal septa 

 ~5! spot ashen white, definite, subcircular. 



On artificial media poor in carbohydrates mycelium lighter in color, 

 spores lighter, smaller, and with fewer septa. 



Habitat : 



>phyll 



N. C. — F. L. Stevens and J. G. Hall, N. C. Agricultural Experiment 

 Station, West Raleigh. 



? Stevens and Hall, Variation of fungi due to environment, ined. Read before 

 the Botanical Society of America at the Baltimore meeting, December, 1908. 



8 Saccardo, Syll. Fung. 18:638. 



