136 



C. D. Sherbakoff 



Conidia often with parabolic dorsal curve, conspicuously broader in 

 the middle, with long and narrow apex, prominently pedicellate, typically 

 5-septate, 49.1x4.6 (43-54.5 x 4.5-4.7) /x, often 3- to 7-septate, 0- to 

 2- and 8-septate very rare, in minute sporodochia more or less converging 

 into pseudopionnotes, from buff-pink to cinnamon on hard potato agar 

 rich in glucose; intercalary chlamydospores always present; aerial mycelium 

 very poorly developed or not developed at all, leaving slimy layer exposed; 

 substratum about the same color as the spores. 



Hab. Often on Pisum sativum, seldom on underground part of stem 

 of Solarium tuberosum, in Germany, and cause of fruit rot of Solarium 

 lycopersicum in Germany and in the United States. 



Fig. 7. — Fusarium falcatum. a, Pseudopionnotal co?iidia, b, chlamydospores in mycelium 

 and in spore, from 1 19-days-old culture on hard lima-bean agar with 2 per cent glucose; 

 c, chlamydospores, d, pseudopionnotal conidia, from 71-days-old culture on red raspberry cane 

 plug; e, pseudopionnotal conidia from ^2-days-old culture on potato stem plug 



Differs from F. gibbosum mainly in having parabolic dorsal curve and 

 typically exposed pseudopionnotes; also in considerably longer conidia. 



The organism was not isolated by the writer, but the culture was obtained 

 through the courtesy of Dr. Wollenweber. The writer's cultural observa- 

 tions in regard to septation and size of spores of this organism on various 

 media are as follows: 



On slightly acidified hard potato agar, culture twenty-four days old: 



Conidia: 3-septate, 3 per cent, 28-42 x 3.5-4/z ] , . . ,,. 



' , 00 .„ _ . \ (only a lew measured) 



4-septate, 9 per cent, 33-42 x 3.5^/jl J 



5-septate, 77 per cent, 50 x 4.5 (43-58 x 4-5.3) n 



6-septate, 10 per cent, 54 x 5 (50-60 x 4.8-5.3)/* 



7-septate, 1 per cent, about 60-70 x 4.8-5.3/t 



