FusARiA OF Potatoes 145 



On rye grain, culture sixty-five days old: 



(1) From a slimy heap of conidia 1 millimeter in diameter 

 Conidia: 3-septate, 27 per cent, 43 x 3.8 (31-49 x 2.9-4.7) /i 



4-septate, 11 per cent, 44 x 4.1 (40-63 x 2.6-4.8) m 

 5-septate, 62 per cent, 54.5 x 4.1 (43-67 x 3-5.2) ^ 



(2) From a minute, semi-dry fleck of conidia, culture sixty-six days old 

 Conidia: 0-septate, 2 per cent 



1-septate, 3 per cent, 20x3.51 i ^ e in 



2-septate, 3 per cent, 23x3.9/ ^"^^^ ^ ^^^ measured) 

 3-septate, 65 per cent, 32 x 3.9 (22-47 x 3.5^.4)^ 

 4-septate, 12 per cent, 43 x 4.1 (38-48 x 3.5-4.4)/x 

 5-septate, 15 per cent, 45x4.3 (38-48 x 3.5-4.7) /x, the largest 

 53 x 5.25)U 



On hard lima-bean agar, culture ten days old: 

 Conidia: 3-septate, 6 per cent, 48 x 3.7/i (only three measured) 

 4-septate, 4 per cent 

 5-septate, 90 per cent, 61 x 3.9 (43-68 x 3.5-4.1)^ 



Average of the above measurements: 

 Conidia: 0- to 2-septate, rare 



3-septate, 26 per cent, 40.4 x 3.7/i 

 4-septate, 19 per cent 

 5-septate, 54 per cent, 53 x 4.1/^ 

 6- and 7-septate, 1 per cent 



The averages of Appel and Wollenweber's measurements are as follows: 

 Conidia: 3-septate, 9 per cent, 39x3.9/1 

 4-septate, 14 per cent, 43 x 4.2/t 

 5-septate, 76 per cent, 53 x 4.3/x 

 6-septate, 1 per cent, 63 x 4.6/1 



13. Fusarium metacroum Ap. et Wr. var. minus n. var. (Fig. 11) 



Conidial type as in F. metacroum, 5-septate conidia 54 x 3.6 (46-60 x 

 3.4-3.9) M. 



Hab. On stem of Solanum tuberosum, New York State. 



Differs from F. metacroum by narrower conidia, often distinct plecten- 

 chymic substratum, and swellings in hyphse very similar to true chlamydo- 

 spores. 



