FusARiA OF Potatoes 



197 



i 



On red raspberry, cane plug, culture thirty-two days old; conidia from 



aerial mycelium: 



Conidia: 1-septate, few 



3-septate, 43 per cent, 30 x 3.8 (19-42 x 2.6-4.3) m 

 4-septate, 36 per cent, 36 x 4 (31^2 x 3.5-4.3) m 

 5-septate, 21 per cent, 39 x 4.1 (33^3 x 3.9^.7) m 



On hard lima-bean agar with 2 per cent glucose, culture eight days old; 



conidia from pseudopionnotes : 



Conidia: 3-septate, 60 per cent, 41 x 3.7 (35-48 x 3.5-4.1)^ 

 4-septate, 25 per cent, 51 x 3.8 (44-60 x 3.5-4.1)/x 

 5-septate, 15 per cent, 55 x 3.8 (52-56 x 3.5-4);u 



Fig. 26. — Fusarium sanguineum var. pallidium. a, Pseiidopionnotal conidia from 32-days- 

 old culture on red raspberry cane plug; b, pseudopionnotal conidia from 3-days-old culture on 

 slightly acidified hard potato agar; c, pseudopionnotal conidia with densely granulated content 

 and indistinct septation from 8-days-old culture on hard lima-bean agar with 2 per cent glucose: 

 D, conidia (normal, swollen, and with chlamydospores) from aerial mycelium from 35-days-old 

 culture on whole steamed potato tubers; e, chlamydospore-like swellings in mycelium from 176- 

 days-old culture on corn agar; f, g, h, conidiophores from 14-days-old culture on hard lima- 

 bean agar; i, pseudopionnotal conidia from 35-days-old culture on ivhole steamed potato tubers; 

 3, pseudopionnotal and aerial conidia from 14-days-old culture on hard lima-bean agar 



On whole steamed potato tuber, culture thirty-eight days old: 

 (1) From a tuft of conidiophores over dry surface of the tuber ;*^ type 

 of spores very much like that of F. discolor var. triseptatum 

 Conidia: 1-septate, 2 per cent 



2-septate, 7 per cent, about 17 x S.Q/x 

 3-septate, 72 per cent, 24 x 4.5 (19-32 x 4-^.8) m 



*> This type is very different from the general type, and therefore was not taken into account for average 

 size of conidia. 



