162 



C. D. Sherbakoff 



4.3m) to sickle-shaped, 5-septate type dominant, in sporodochia and 

 pseudopionnotes, measuring 18.5 x 3.63 (41-61 x 2.9-4.4) /*; in pseudo- 

 pionnotes, 6- to 9-septate conidia are common, 60-100 x 4.7-5.2^, from 

 slightly curved to straight and anguiform, apically pointed, distinctly but 

 not prominently pedicellate, in mass typically of light pink-cinnamon 

 color; chlamydospores absent; sporodochia when present often of a large 

 size (up to 3.7 centimeters in diameter); aerial mycelium typically well 

 developed, of uniformly medium fineness, white; substratum, on potato 



Fig. 16. — Fusarium diver sisporum. a, Pseudopionnotal conidia from 26-days-old culture 

 on hard oat agar; b, sporodochial conidia, c, arthrosporial conidia, D, aerial conidiophores 

 producing arthrosporial conidia, from 76-days-old culture on red raspberry cane plug; E, pseudo- 

 pionnotal conidia from 8-day s-old culture on hard lima-bean agar with 2 per cent glucose; f, typical 

 sporodochial conidia from 11 3-day s-old culture on potato stem plug; G, sickle-shaped, normal 

 conidia, h, arthrosporial, more or less abnormal, conidia, frarn aerial mycelium of 45-days-old 

 culture on whole steamed potato tuber; i, pseudopionnotal conidia, J, mycelial conidiophores 

 and conidiophores produced directly on spores, k, conidia, from 10-days-old culture on medium 

 potato agar; l, typical sporodochial conidia from ^6-days-old culture on whole steamed potato 

 tuber; m, chlamydospore-like structures in old conidia from 173-days-old culture on corn agar; 

 N, sporodochial conidia from ^2-days-old culture on rye straw; o, sporodochial conidia from 

 116-days-old culture on rye straw; p, sporodochial conidia from 24-days-old culture on potato 

 tuber plug; Q, conidiophore from 2 4-day s-old culture on potato tuber plug 



agar rich in glucose, ranging from onion-skin pink and clay color when 

 young to Saccardo's amber in old cultures. 



Hab. On rotted tubers of Solarium tuberosum, New York State, in close 

 association with F. metacroum. 



