226 



C. D. Sherbakoff 



On hard oat agar, culture fourteen days old; conidia from pseudopion- 



notes : 



Conidia: 0-septate, 4 per cent, 10 x 2.5/* 

 1-septate, 1 per cent 

 2-septate, rare 



3-septate, 70 per cent, 44 x 4.04 (39-50 x 3.5-4.7)/* 

 4-septate, 20 per cent, 45 x 4.2 (41-50 x 4r4.7) n 

 5-septate, 5 per cent, 49 x 4.46 (42-51 x 4.3-4.7) /* 



Average of the above measurements: 

 Conidia: 0-septate, 24 per cent, 10 x 2.6m 

 1-septate, 7 per cent, 17.5 x 3.2/z 

 2-septate, 1 per cent, 21 x 3.2/* 

 3-septate, 52 per cent, 38.94 x 4.04/t 

 4-septate, 12 per cent, 44.25 x 4.35/t 

 5-septate, 4 per cent, 48.7 x 4.4/* 



Fig. 37. — Fusarium oxysporum var. resupinatum. a, Pseudopionnotal conidia from 15- 

 days-old culture on slightly acidified hard potato agar; b, conidiophores from 6-days-old culture 

 on hard lima-bean agar; c, conidiophore from 12-days-old culture on hard lima-bean agar; 

 d, pseudopionnotal conidia from 6-days-old culture on hard lima-bean agar; e, conidiophores 

 and chlamydospores, f, conidia, from \l '-days-old culture on red raspberry cane plug 



43. Fusarium oxysporum Schlecht. var. resupinatum n. var. (Figs. 

 1l x and 37; PI. I, figs. 7 and 8; PL v, fig. 5) 



Differs from F. oxysporum by absence of sclerotia, from var. asclerotium 

 and var. longius by shorter and somewhat narrower macroconidia. 

 Mycelium on different agars typically entirely resupinate (PI. i, figs. 7 

 and 8). 



