Fusaria of Potatoes 



173 



22. Fusarium anguioides var. caudatum n. var. (Fig. 19; PL vi, fig. 9) 

 Conidial type very much the same as that of F. anguioides, but 8- 

 to 11-septate conidia very rare and the size for the same septation 

 somewhat larger; conidia never in macroscopically observable thick 

 pseudopionnotes as is often the case in F. anguioides when grown on various 

 agars. Conidia of this fungus, even in comparatively young cultures, 

 often produce on one end a long, usually unbranched, germ tube (see 

 certain conidia in figure 19), which has never been observed in F. 

 anguioides. 



Fig. 19. — Fusarium anguioides var. caudatum. a, Pseudopionnolal conidia from 10-days- 

 old culture on slightly acidified hard potato agar; b, conidia from 6 1 -days-old culture on red 

 raspberry cane plug; c, typical, d, degenerated, conidia, e, conidiophores, from 61 '-days-old culture 

 on potato stem plug; f, conidia from 15-days-old culture on wheat grain; G, pseudopionnotal 

 conidia from 9-days-old culture on hard lima-hean agar; h, conidiophores, i, pseudopionnolal 

 conidia, J, chlamydospore-like mycelial swelling, k, conidiophores, from 11-days-old culture 

 on medium potato agar; l, pseudopionnotal conidia from 1 6-day s-old culture on hard lima- 

 bean agar with 2 per cent glucose; M, pseudopionnotal conidia from 37-days-old culture on hard 

 oat agar; n, conidiophores from 11-days-old culture on ?nediu7n potato agar 



Hab. On rotted tubers of Solanum tuberosum, in association with 

 F. coeruleum, Ithaca, New York. 



Measurements of conidia from cultures on different media are as follows: 



