214 C. D. Sherbakoff 



37. Fusarium lutulatum var. zonatum n. var. (PL I, figs. 9 and 10; 

 PI. v, fig. 4) 



Differs from F. lutulatum by slightly shorter and broader microconidia; 

 usually by the absence of chlamydospores in conidia; 47 by conidia 

 somewhat less pointed than those in F. lutulatum; by commoner produc- 

 tion of aerial mycelium; and by more or less distinct zonation of colony 

 growth on neutral agars. Spore color begins to develop earlier but usually 

 does not reach the density of that of F. lutulatum. The organism does not 

 produce rot of potato tubers, while F. lutulatum, at least in most of the 

 inoculations made, is capable of causing such rot. No sclerotia observed. 



Hab. On rotted tubers of Solarium tuberosum together with F. oxy- 

 sporum var. resupinatum and F. sanguineum, at Ithaca, New York. 



The size of the conidia is in many instances almost identical with that 

 in F. lutulatum, and in general there is scarcely any very sharp distinction 

 between the two organisms; but there are at least slight differences in 

 many of the important characters, so that in general there can hardly be 

 any serious doubt that these are two distinct, though closely related, 

 organisms. 



Average of the measurements of conidia on the same media, of the same 

 age, and the same in other ways, as those of F. lutulatum, is as follows : 



Conidia: 0-septate, 23 per cent, 9 x 2.8/x 

 1-septate, 5 per cent, 16 x 3.1/x 

 2-septate, 2 per cent, 22 x 3.5m 

 3-septate, 69 per cent, 32.77 x 4.16^ 

 4-septate, 1 per cent, 39.4 x 4.4/* 

 5-septate, very rare, 39.3 x 4.6/* 



38. Fusarium sclerotioides n. sp. (Figs. Id and 33; PI. i, figs. 11 and 12; 

 PI. v, fig. 1) 



Microconidia gradually attenuate toward and more or less pointed at 

 the apex, pedicellate, generally somewhat more distinctly curved near apex, 

 and broader in the middle or in the upper third of their length, typically 

 3-septate, 34.7x4.4 (30-39.5 x 4.1-4.6) n, also 2- to 5-septate, 4- and 

 5-septate being of more or less common occurrence; chlamydospores 

 observed only in mycelium (intercalary and terminal), and not very 



" These were observed in number only once, and then when the culture was very old and much con- 

 taminated with bacteria. It was observed generally that a bacterial contamination greatly stimulates 

 production of chlamydospores. 



