260 C. D. Sherbakoff 



On whole steamed potato tuber, culture sixty days old; conidia from a 

 sporodochium : 

 Conidia: 0-septate, 11 per cent 



1-septate, 21 per cent 



2-septate, 8 per cent 



3-septate, 60 per cent, 31 x 4.8 (29-38 x 4.2-5.5) /i 



4-septate, very rare 



On oat grain, culture fifty-seven days old; conidia from a sporodochium, 

 septation as above: 



Conidia: 3-septate, 35.2 x 4.7 (25^2.5 x 4.2-5) n 

 4-septate, 43 x 5/x (only one measured) 



On potato stem plug, culture seventy days old; conidia from a sporo- 

 dochium, septation approximately that given above: 

 Conidia: 3-septate, 35.2 x 5 (24.5-38 x 3.7-5.5) ju 



4-septate, 41.6 x 5.8/x (only one measured) 



On hard potato agar, culture ten days old; conidia from aerial myce- 

 lium close to substratum: 

 Conidia: 0-septate, 30 per cent 



1-septate, 10 per cent 



2-septate, 5 per cent 



3-septate, 50 per cent, 40 x 4.6 (32-46 x 4.3-4.9)/* 



4-septate, 5 per cent, 47 x 4.8 (45-^9 x 4.5-5)/* 



Average of the above measurements: 

 Conidia: 0-septate, 56 per cent (from 11 to 95 per cent), 8 x 3/t 

 1-septate, 16 per cent (from 5 to 30 per cent), 15 x 4/z 

 2-septate, 3 per cent (from to 8 per cent) 

 3-septate, 23 per cent (from to 60 per cent), 35.2 x 4.73/t 

 4-septate, 2 per cent (from to 5 per cent), 43.9 x 5.1/t 

 5-septate, very rare, size about that of 4-septate 



61. Fusarium coeruleum (Lib.) Sacc. (Figs. 1b 2 and 48; PI. i, figs. 5 

 and 6; PL vi, fig. 4) 



Syn. Fusarium violaceum Fuckel. 1869. 



Selenosporium coeruleum Libert, in herbarium. 



Cf. Saccardo, Syll. Fung. 4:705. 1886. Appel, O., and Wollenweber, 

 H. W., Arb. K. biol. Anst. Land- u. Forstw. 8:84-91, PL in fig. 6, 



