140 



C. D. Sherbakoff 



10. Fusarium caudatum Wr. var. Solani n. var. (Figs, lz and 9; PL iv, 

 fig. 7; PL vi, fig. 3) 



Conidia with from parabolic to ellipsoid dorsal curve, conspicuously 

 broader at the middle, with very long, narrow, whiplike apex, prominently 

 pedicellate, typically 5- to 7-septate; measuring on the average, 5-septate, 

 48x4.6 (40-55 x 4.3-4.7) /x, 7-septate, 64.7x4.6 (57-69 x 4.4-4.8) n; 

 rarely in pseudopionnotes, typically in small aplectenchymic sporodochia, 

 tinted from cream-buff to cinnamon, clay, and Saccardo's amber in a 



Fig. 9. — Fusarium caudatum var. Solani. a, Pseudopionnotal conidia, b, conidiophores, 

 from 9-days-old culture on slightly acidified hard potato agar; c, pseudopionnotal conidia (nun 

 38-day s-old culture on potato stem plug; d and e, chlamydospores from 50-day s-old culture on 

 red raspberry cane plug {magnification 250 times); f, conidia from aerial sporodochium of 118- 

 days-old culture on hard lima-bean agar with 2 per cent glucose; G, cluster of chlamydospores, 

 H, aerial conidia, from 50-days-old culture on rye straw; i, sporodochial conidia in oozing drop of 

 liquid from 9-days-old culture on hard lima-bean agar; J, aerial conidia, k, intercalary chlamydo- 

 spores, from 69-days-old culture on red raspberry cane plug 



plate culture on a potato hard agar rich in glucose; chlamydospores 

 intercalary, always present in greater or less abundance; aerial mycelium 

 very well developed, high, uniform, medium dense, from hyaline when 

 young to sepia in old cultures, mostly from brownish to dresden brown; 

 substratum, on potato agar rich in glucose, from pinkish buff when young 

 to ochraceous tawny and snuff brown shaded to sepia in very old cultures. 

 Hab. On superficial dry-rot spots on tubers of Solarium tuberosum, 

 Atlanta, New York. 



