218 



C. D. Sherbakoff 



On hard oat agar, culture twenty-four days old; conidia from a sporo- 



dochium : 



Conidia: 3-septate, 64 per cent, 39.5 x 4.3 (36-52 x 4-4.7) ^ 

 4-septate, 28 per cent, 41 x 4.3 (38-45 x 4-4.7) /i 

 5-septate, 8 per cent, 43 x 4.5 (38-46 x 4. 1-4.7) ^ 



Average of the above measurements : 

 Conidia: 0-septate, 16 per cent, 9.5 x2.25/i 

 1-septate, 3 per cent, 13.4 x 2.5/i 

 2-septate, rare 



3-septate, 63 per cent, 34.7 x 4.4/x 

 4-septate, 15 per cent, 37.9 x 4.43/x 

 5-septate, 3 per cent, 39.35 x 4.55/i 



Fig. 34. — Fusarium sclerotioides var. brevius. a, Pseudopionnotal conidia from 8-days- 

 old culture on hard lima-hean agar; b, sporodochial conidia, c, conidia from aerial mycelium, 

 from 19-days-old culture on slightly acidified hard potato agar; d, sporodochial conidia from 

 45-day s-old culture on red raspberry cane plug; e, conidia from aerial mycelium from 13-days- 

 old culture on hard lima-bean agar with 2 per cent glucose; f, sporodochial conidia, g, aerial 

 conidia, from 60-days-old culture on whole steamed potato tuber; h, sporodochial conidia from 

 35-days-old culture on oats; i, chlamydospores from 45-days-old culture on red raspberry cane 

 plug; J, chlamydospores from 25-days-old culture on corn agar; k, l, conidiophores from 19- 

 days-old culture on slightly acidified hard potato agar; u, swollen tips of aerial hyphce from 

 13-day s-old culture on hard lima-bean agar with 2 per cent glucose 



39. Fusarium sclerotioides var. brevius n. var. (Fig. 34; PI. ii, figs. 1 

 and 2) 



Differs from F. sclerotioides mainly by nearly constant absence of 4- 

 and 5-septate conidia, by absence of large bluish black sclerotia, and by 

 noticeably shorter, 3-septate conidia. 



Hab. In discolored fibrovascular bundles of tubers of Solanum tube- 

 rosum, Alabama. 



Measurements of the conidia on different media are as follows: 



