Edgerton: Cotton Anthracnose 



119 



similar, yet in some details there is considerable divergence in 

 some of them. The form from cotton represents, perhaps, one of 

 the most divergent types. I have studied this for some time and 

 find no evidence for placing it in the same species with the orga- 

 nism causing the rot of various fruits. I have made many cul- 

 tures at different times and from different places and find little 

 variation in them. The characters which distinguish this from 

 other forms may be briefly stated as follows : ( I ) A difference 

 in color of the masses of spores, the cotton anthracnose spore- 

 masses being more salmon than pink in color; (2) the abundance 

 of setae; (3) the production of spores on the points of the setae; 

 (4) the entirely distinct cultural characters; (5) the inability to 

 inoculate satisfactorily other forms on cotton, or the cotton form 

 on fruits, etc. ; (6) the slight difference in the shape of the 

 ascospores. 



Consequently, believing that the evidence is sufficient to keep 

 this form separate, I propose for it the following name and 

 diagnosis : 



Glomerella Gossypii sp. nov. 



Perithecia distinct or crowded, very abundant, buried in the 

 tissue of the host with only the beaks protruding, or rarely on the 

 surface, dark brown to black, subglobose to pyriform, 80-120 X 

 100-160 /a, mostly about 115 X 140^. Beak of the perithecium 

 sometimes 60 /x or more in length. Asci numerous, clavate, 55- 

 70 X 10-14 /x, mostly 10-11 fi in thickness. Spores uniseriate or 

 irregularly biseriate, nearly elliptical, or rarely slightly curved, 

 granular, hyaline, showing a clear nucleus near the center, 12-20 

 X 5-8 averaging 13-14 X 7 jw. Paraphyses long, slender, very 

 abundant, filling the entire cavity of the perithecium above the 

 asci. 



Perfect stage of Colletotrichum Gossypii Southworth, which 

 preceded and accompanied it. Bolls of Gossypium herbaceum, 

 August, 1908, Baton Rouge, La. Type material, with prepared 

 sections, deposited in the United States National Herbarium, 

 Washington, D. C. 



Louisiana Agricultural Experiment Station. 



