146 



C. D. Sherbakoff 



The organism was isolated only once, from a half-dead stem of potato 

 plant at Atlanta, New York, from a pseudopionnotal spore mass. The 

 measurements of the conidia produced by the organism on various media 

 are as follows: 



On red raspberry cane plug, culture thirty-one days old: 

 Conidia: 1-septate, 0.5 per cent, 20 x 2.5/* 

 2-septate, very few 



3-septate, 46.5 per cent, 43 x 2.8 (23-53 x 2.3-3.5)/* 

 4-septate, 31 per cent, 48 x 3.2 (40-60 x 2.3-3.5)/* 

 5-septate, 22 per cent, 52 x 3.4 (42-60 x 2.9-4)/* 

 6-septate, rare, 61 x 3.4/* (only one measured) 



Fig. 11. — Fusarium metacroum var. minus. A, Conidia from 1 8-days-old culture on hard 

 lima-bean agar; b, conidia from the original specimen, potato stem, August 7, 1912; c, chlamydo- 

 spore-like structures of hyphoe from 26- and 176-days-old cultures on corn agar; d, conidiophore 

 from the original specimen, potato stem, August 7, 1912; e, conidiophores from 31 -days-old 

 culture on red raspberry' cane, plug; f, conidia producing numerous conidiophores from 10-days- 

 old culture on hard lima-bean agar; g, normal conidia from 10-days-old culture on hard lima- 

 bean agar; h, conidiophores from 31-days-old culture on red raspberry cane plug; i, conidia 

 from 31-days-old culture on red raspberry cane plug. All conidia are from pseudopionnotes 



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

 Conidia: 3-septate, 17 per cent 

 4-septate, 17 per cent 

 5-septate, 66 per cent, 60 x 3.6 (53-65 x 3-4.2)/* 



On potato tuber agar, culture ninety-eight clays old: 

 Conidia: 0-septate, 5 per cent 

 1-septate, 5 per cent 

 2-septate, rare 



3-septate, 20 per cent, 34 x 3.5 (26-39 x 3-4)/* 

 4-septate, 30 per cent, 42 x 3.8 (36-48 x 3.5-1.1)/* 

 5-septate, 40 per cent, 46 x 3.9 (40-54 x 3.5-4.1)/* 



