Fusaria of Potatoes 



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17. Fusarium truncatum n. sp. (Figs. 1, Ci to E b and 14; PL vn, fig. 1) 

 Conidia typically sickle-shaped, gradually pointed toward the apex, 

 slightly broader at or just above the middle, distinctly pedicellate, 3- to 

 5-septate; 3-septate averaging 35 x 3.7 (31.5-42 x 3.4-3. 9)/z, 5-septate 

 averaging 45 x 3.9 (43-48 x 3.4-4.2) n; from cinnamon and terra cotta to 

 carmine-pomegranate purple in color; conidiophores from loose to dense, 

 bushlike, single or in from small to large (up to \ centimeter in diameter) 

 sporodochia; aerial mycelium always well developed, mostly composed of 

 fine but macroscopically distinct threads, from white to slightly carmine 

 near substratum ; color of substratum, on hard potato agar rich in glucose, 



Fig. 1-4. — Fusarium truncatum. a, Sporodochial conidia from 60-days-old culture on red 

 raspberry cane plug; b, aerial conidia from 13-days-old culture on hard potato agar; c, aerial 

 conidia (some with distinctly truncate basal cell) from 1 4-day s-old culture on medium potato 

 agar; n, conidiophore from 13-days-old culture on hard potato agar; e, sporodochial conidia from 

 1 4-day s-old culture on medium potato agar; f, conidiophores from 4? -days-old culture on potato 

 tuber plug; G, sporodochial conidia from 37-days-old culture on hard oat agar; h, conidia from 

 aerial mycelium from 47-days-old culture on potato tuber plug; i, conidiophore from 4-days-old 

 colony in petri dish on hard potato agar with 10 per cent glucose 



varies from pale cinnamon and diffuse salmon hues to corinthian and 

 brick red, more or less distinctly zonate. 



Hab. On rotted tubers of Solanum tuberosum, New York State. 



Latin description. — Conidiis typice falciformibus, gradatim in apicem 

 acutis, paulo latioribus medio vel subinde supra medium, distincte pe- 

 dicellatis 3-5-septatis; 3-septatis plerumque 35x3.7 (31.5-42 x 3.4-3. 9)/x, 

 5-septatis plerumque 45x3.9 (43-48 x 3.4-4.2) pi; e " cinnamon" (R) 

 et "terra cotta" (R) "carmine" (R) et "pomegranate purple" (R); co- 



