136 



CD. 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^.7) m, often 3- to 7-septate, 0- to 

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

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

 rich in glucose; intercalary chlamj^dospores always present; aerial mycelium 

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

 substratum about the same color as the spores. 



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

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

 lycopersicum in Germany and in the United States. 



Fig. 7. — Fitsariiun falcatum. a, Pseudoviontiotal conidia, b, chlamydos pores in mycelium 

 and in spore, from 119-days-old culture on hard lima-bean agar with 2 per cent glucose; 

 c, chlamydospores, d, pseudopionrwtal conidia, frojn 71-days-old culture on red raspberry cane 

 plug; E, pseudopionnotal conidia from 43-days-old culture on potato stem plug 



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

 typically exposed pseudopiomiotes; 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: 



(only a few measured) 



On shghtly acidified hard potato agar, culture twenty-fom' days old: 

 Conidia: 3-septate, 3 per cent, 28-42 x 3. 5^^ 

 4-septate, 9 per cent, 33^2 x 3.5^ai 

 5-septate, 77 per cent, 50x4.5 (43-58 x 4-5.3) ^ 

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

 7-septate, 1 per cent, about 60-70 x 4.8-5.3/4 



