FusARiA OF Potatoes 269 



This organism, togetlier with Fusarium udum var. Solani, was isolated 

 by the writer only once, from a planting of diseased tissues of a potato 

 tuber affected with a superficial dry rot, received from Long Island, 

 New York. 



By the shape and size of its conidia it very closely resembles R. macro- 

 spora Fres. (see WoUenweber 1913 c: 222-223, 235, PL xx, a and b, and 

 PI. XXI, e), but differs mainly by the absence of oval, continuous conidia 

 on aerial mycelium, and by the absence of chlamydospores.^^ 



LITERATURE CITED 



Appel, Otto, and WoUenweber, H. W. 



1910 Grundlagen einer monographie der gattung Fusarium (Link). 

 K. Biol. anst. Land- und Forstw. Arb. 8:1-207, figs. 

 1- 10, Pis. 1-3. 



Jamieson, C. O., and WoUenweber, H. W. 



191 2 An external dry rot of potato tubers caused by Fusarium 



trichothecioides Wollenw. Washington Acad. Sci. Journ. 

 2 : 146-152. 



Lewis, Charles E. 



1913 Comparative studies of certain disease-producing species of 



Fusarium. Maine Agr. Exp. Sta. Bui. 219:203-258, figs. 

 86-118. 



Lindau, G. 



1905 Die Pilze. Rabenhorst's Kryptogamen Flora 8:391-392. 

 1908 Sorauer's Handbuch der Pflanzenkrankheiten 2 : 468-469. 

 1908-1909 Die Pilze. Rabenhorst's Kryptogamen Flora 9 : 336, 503, 

 509, 517-588. 



Ridgway, Robert. 



1912 Color standards and color nomenclature. 53 colored plates, 



1115 named colors. 



Shear, C. L., and Wood, Anna K. 



1913 Studies of fungous parasites belonging to the genus GlomereUa. 



U. S. Plant Indus. Bur. Bui. 252:5-110, pis. 1-18. 



6> Chlamydospores were searched for very carefully in cultures on different media and of different ages, 

 very old cultures befng included, but were never observed. According to WoUenweber (1913 c : 208) 

 such organisms, Ramularia-like but without chlamydospores, produce perfect forms of the genu^ Myco- 

 sphserella; although the organism described here under the name o{R. Solani, when grown on various media, 

 did not produce chlamydospores, nevertheless it has been retained in this genus because of its otherwise 

 perfect resemblance to the other unquestionable species of Ramularia. 



