FusAEiA OF Potatoes 257 



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



(1) Conidia from a sporodochium 



0-septate, 13 per cent 



1-septate, 30 per cent 



2-septate, 7 per cent 



3-septate, 50 per cent, 33 x 4.4 (24-44 x 3.6-4.7) /x 



4-septate, very few 



(2) Chlamydospores, terminal and intercalary, mostly 0-septate, 9 x 7.5 



(7-11 X 6-9) M 



On same medium as above, culture thirty-two days old; conidia from 

 a sporodochium: 



Conidia: 0-septate, 1 per cent, 9 x S.Qiu. (only a few measured) 

 . 1-septate, 20 per cent, 20 x 3.9 (14-25 x 3.5-4.1)^ 

 2-septate, 5 per cent, 25 x 4.2 (23-30 x 4-4.4) ^ 

 3-septate, 73 per cent, 35 x 4.6 (28-37 x 4-4.7) m 

 4-septate, 1 per cent, 41 x 4.7^t (only a few measured) 



Average of the above measurements: 

 Conidia: 0-septate, 12 per cent, 10 x 3.4^ 

 1-septate, 19.5 per cent, 20 x 3.9/* 

 2-septate, 5.5 per cent, 24.5 x 4.2)U 

 3-septate, 60 per cent, 34.7 x 4.6At 

 4-septate, 3 per cent, 43.7 x 4.7/t 

 5-septate, very rare, 50 x 4.8/i 



60. Fusarium radicicola^'' Wr. (Fig. 47; PL vi, fig. 8) 



Wollenweber, H. W., Journ. Agr. Research 2:257-258, PI. xvi, fig. k, 

 1914. 



Microconidia nearly straight near base, slightly curved in upper third 

 of their length, with from somewhat rounded to distinctly constricted 

 apex, slightly pedicellate, mostly 3-septate, 35.2x4.7 (31-40 x 4.6-5) ju; 

 0- and 1-septate, microconidia very common, 0-septate measuring 8 x 3/t; 

 chlamydospores common, terminal and intercalary, mostly 0- and 1-sep- 

 tate, 0-septate averaging 9-10x8.7-8.8/*; pseudopionnotes typically 



^" In an article which appeared after this work was ready for press, Dr. Wollenweber (1914) describes a 

 new species of Fusarium (F. radicicola) with which this organism appears identical. No cultural com- 

 parisons have been possible, but the tjTJe of tuber rot and type of conidia are alike, and in certain instances 

 material for study has come from the same region. Possibly any diflerences may be accounted for in the 

 difference in strains studied. 



