FusARiA OF Potatoes 167 



Latin description. — Conidiis biformibus: conidiis sporodochialibus, plus 

 minusve aequabiliter ellipsoidalibus, 3-5-septatis : 3-septatis, 39x3.3 

 (36-46 X 2.9-3. 6) m; 5-septatis 51x3.5 (43-60 x3-4)m; conidiis pseudo- 

 pionnotalibus 0-9-septatis vel etiam 12-septatis, interdum prope rectis 

 vel anguiformibus; 5-septatis, 52x4.2^i; 6-9-septatis, 45-84 x 4-5. S/x; 

 conidiis in totum typice "salmon-color" (R); nuUis chlamydosporis; 

 mycelio plene maturo, uniformi, albo in pseudopionnotum gradu, ex 

 rubello "pomegranate" (R) in gradu sporodochiali (in durae avenae 

 agare); substrato e "brick red" (R) "pomegranate" (R) (in avenae 

 agaribus et aliis agaribus). 



Hab. In tuberibus putridis Solani tuberosi una cum F. coeruleo, Wis- 

 consin, Amer. bor. 



Measurements of the conidia on different media are as follows: 



On corn agar, culture twenty-six clays old; conidia from a thin layer 

 directly on substratum; 



Conidia: 1- to 4-septate, 20 per cent (about an equal number of each) 

 5-septate, 45 per cent, 60 x 3.6 (50-70 x 3.4-3.8) m 



6- to 9-septate, 35 per cent, 80 x 4.4 (77-88 x 4. 1-4.7) /x 



On hard potato agar, slightly acidified, culture fourteen days old; co- 

 nidia from aerial mycelium close to substratum: 

 Conidia: 0-septate, 0.5 per cent, 12 x Sn 



1-septate, 3 per cent, 19 x Sjj, 



2-septate, rare, 25 x 3.2fx 



3-septate, 5 per cent, 32 x 3.7 (24-51 x 3.5^.2) m 



4-septate, 2.5 per cent 



5-septate, 80 per cent, 51.5 x 4.3 (40-74 x 4-5.2) m 



6-septate, 6 per cent, 58 x 4.7 (50-75 x 4.3-5.3) ^ 



7- and 8-septate, 3 per cent, 68 x 4.7 (55-80 x 4.3-5.3) ^ 

 9- to 1 1-septate, rare, 84 x 5.9/x (only a few measured) 



On potato tuber plug, culture seventy-one days old; conidia from aerial 

 mycelium close to substratum: 

 Conidia: 0-septate, 2 per cent, 9 x 3ju 



1-septate, 6 per cent, 14 x S.Sfx, a few 15 x 5.7 fj- 



2-septate, 3 per cent, 20 x 3.4^t 



3-septate, 30 per cent, 27.5 x 3.9 (19-39 x 3.5-4.1)^ 



4-septate, 12 per cent 



