Fusaria of Potatoes 



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4. Fusarium cuneiforme n. sp. (Figs. 1 f and 4) 



Conidia only slightly dorsiventral, more or less wedge-shaped, broader 

 toward the base, with apex somewhat rounded, apedicellate, typically 

 3-septate, 34.7x5.6 (30-41 x 5.6-6) ju, often 0- to 2-septate, in false 

 balls, from hyaline to cream-colored; no sporodochia; aerial mycelium 

 hyaline, in a high tuft in center, and short, distinctly zonate, outside; 

 chlamydospores from smooth to very distinctly warted, sometimes sm\ 

 rounded with a gelatinous capsule, terminal only, typically unicellular, 

 8.2x7.6 (7.6-8.5 x 7.3-8. 1) M . 



Fig. 4. — Fusarium cuneiforme. A, Conidia from false balls of 16-days-old culture on slightly 

 acidified hard potato agar; b, conidia from false balls from 10-days-old potato agar with 0.5 

 per cent glucose; c, conidiophores, d, conidia, from a thin layer of 73-days-old culture on red 

 raspberry cane plug; e, conidia from confluent thin mass of false balk of 64-days-old culture 

 on hard bean agar; f, terminal chlamydospores, G. conidiophore, from 3/ t -days-old culture on 

 hard lima-bean agar; h, terminal chlamydospores of 16-days-old culture on slightly acidified 

 hard potato agar; i, conidia, 3, tips of conidiophores showing beginning of production of new 

 conidia, from 34-days-old culture on hard lima-bean agar; k, conidia, L, terminal chlamydospores, 

 from 26-days-old corn agar; m, anastomosis, and chlamydospore producing conidia from 34- 

 days-old culture on hard lima-bean agar; n, terminal chlamydospores from the same culture 



Hab. The fungus was isolated from soft rotted potato tubers received 

 from Auburn, Alabama, and from Atlanta, New York, always in association 

 with bacteria and other fungi. 



Differs from F. ventricosum Ap. et Wr. mainly in typically 0-septate 

 chlamydospores which are terminal only. There seems to be some differ- 

 ence also in the shape and size of the conidia, which here are somewhat 

 more slender. . 



