FusARiA OF Potatoes 



209 



Average of the above measurements : 

 Conidia: 0-septate, 3.5 per cent, 10.5 x 3.6m 

 1-septate, 1.5 per cent, 21 x 3.95/x 

 2-septate, 0.5 per cent, 26.5 x 4.75m 

 3-septate, 93 per cent, 36.4 x 4.86m 

 4-septate, 1.5 per cent, 41.5 x 5.12m 

 5-septate, rare, 44.3 x 5.2m 

 6-septate, very rare 



36. Fusarium lutulatum n. sp. (Figs. 1fi and 32; PI. ii, figs. 5 and 6; 



PI. V, fig. 3) 



Fig. 32. — Fusarium lutulatum. a, Conidia from plectenchymic sporodochiu?n from 60- 

 days-old culture on red raspberry cane plug; B, pseudopionnotal conidia from 9-days-old culture 

 on hard lima-bean agar with 2 per cent glucose; c, pseudopionnotal conidia from 5-days-old 

 cidture on hard lima-hean agar; d, sporodochial conidia from 63-days-old culture on whole grain 

 of rye; e, sporodochial conidia from 49-days-old culture on whole steamed potato tuber; f, pseudo- 

 pionnotal conidia from 23-days-old culture on slightly acidified hard potato agar; g, h, i, j, 

 conidiophores from 5-days-old culture on hard liyyia-hean agar; k, conidiophores from 23-days- 

 old culture on slightly acidified hard potato agar; l, terminal and intercalary chlamydospores 

 from 63-days-old culture on whole grain of rye; u, chlamydospores from 25-days-old culture 

 on corn agar 



Macroconidia gradually attenuate toward the apex, usually distinctly 

 pedicellate and uniformly curved throughout, without stronger curvature 

 near apex, typically 3-septate, 34x4 (28-38 x 3.7^. 5)m, also 2- to 5- 

 septate; from small to medium sporodochia (up to 2 millimeters in diam- 

 eter), often converging into pseudopionnotes; aerial mycelium, when 

 present, short, (mostly from 1 to 2 millimeters high), white, often, especially 

 on agars in plate cultures, absent; color of conidia from nearly white 



