FusARiA OF Potatoes 



177 



exhibente; substrate ex argillaceo "buckthorn brown" (R) vel nitide rubro 

 (Tab. Ill, fig. 4). Fungo locum medium inter Sectiones Arthrosporiellam 

 et Sporotrichiellam obtinente. 



Hab. In textibus decoloratis Solani tuberosi tuberum, Hibernia. 



Measurements on different media are as follows : 



On slightly acidified hard potato agar, culture eleven days old; conidia 



from aerial mycelium: 



Conidia: 0-septate, 0.5 per cent, 12 x 2.7ju 



1-septate, 15.5 per cent, 25 x 3.8 (17-30 x 2.6-4.7)^ 

 2-septate, 3 per cent, 27 x 4;u 

 3-septate, 77.5 per cent, 35 x 3.5 (22-48 x 3-4.4) At 

 4-septate, 3 per cent, 43 x 4.2 (35-50 x 3.5-4.8)/^ 

 5-septate, 0.5 per cent, 47 x 4.4^1 (only a few measured) 



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



0-septate, 4.7 per cent, 10 x 2.6/x (only a few 



measured) 

 1-septate, 4.7 per cent, 19 x 3.1 (14-24 x 



2.9-3.5)/x 

 2-septate, few, 28 x 3.3ju (only a few measured) 

 (1) Sickle-shaped conidia •=] 3-septate, 5.9 per cent, 34x4 (31-40x3.3- 



4.7)m 

 4-septate, 0.5 per cent, 43 x 4.3 (35-44 x 



4.1-4.7)m 

 5-septate, 0.6 per cent, 47 x 4.4 (43-54 x 



4.1-4.8)m 

 'O-septate, 13 per cent, 8.5 x 4.3 (6-12 x 3.5- 



6.4)m 

 1-septate, 23.5 per cent, 15 x 4.4 (9-20 x 



3.5-5.3)m 

 2-septate, 11.7 per cent, 18x5.2 (13-35 x 



4.7-6) M 

 3-septate, 35.4 per cent, 25x5.4 (19-33 x 



4.7-6) M 

 4-septate, few, 39 x 6 (33-47 x 5-7) ^ 

 5-septate, few, 46 x 5.7 (42-56 x 5.2-6) /x 

 The largest conidium observed was 8- 



septate (exceptionally close-septate), and 



measured 58 x 6.5/^ 



(2) Arthrosporial conidia 



