FusARiA OF Potatoes 



199 



Latin description. — Conidiis typice paulo minus arcuatis quam ceteris 

 ejusdem sectionis speciebus, minus in apicem acutis, latioribus, plerumque 

 distincte pedicellatis, plerumque 5-septatis, 42 x 4.3 (31-47 x 4. 1-4.9) /x, 

 e pallide ''cream color" (R) "salmon color" (R); chlamydosporis inter- 

 calaribus in mycelio, plerumque catenulatis, parvis vel magnis uveosis; 

 aerio mycelio semper plene maturo, uniform! mediocri altitudine atque 

 densitate, ferme pure albo; substrato in agaribus variis ex hyalino pallide 

 luieolo tincto. 



Hab. In tuberibus putridis Solani tuberosi una cum F. buUato var. 

 roseo et cum F. oxysporo var. resupinato, Iowa, Amer. bor. 



Fig. 27. — Fusarium bullatum. a, Pseudopionnotal conidia from 10-days-old culture on 

 hard lima-bean agar; b, pseudopionnotal conidia from 77-days-old culture on red raspberry 

 cane plug; c, a typical conidium from 51 -days-old culture on potato tuber plug; d, conidia from 

 76-days-old culture on potato tuber plug; e, conidia from 19-days-old culture on hard lima-bean 

 agar; f, pseudopionnotal conidia from 7-days-old culture on hard potato agar; g, conidia, h, 

 chlamydospores, from 4^-days-old culture on rye straw; i, chlamydospores from 77-days-old 

 culture on red raspberry cane plug; J, conidiophores from 7-days-old culture on hard potato agar; 

 K, conidiophore from 10-days-old culture on hard lima-bean agar; l, chains of chlajnydospores 

 from 175-days-old culture on corn agar 



Measurements of conidia on different media are as follows: 



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



from pseudopionnotes : 



Conidia: 3-septate, 16 per cent, 36 x 3.8 (29-50 x 3.5^.9) ^ 

 4-septate, 19 per cent, 43 x 4.1 (33-50 x 3.9^.9)^ 

 5-septate, 65 per cent, 45 x 4.4 (37-63 x 4.1-4.9)/* 

 6- to 8-septate, rare, 65 x 4.9 (60-82 x 4.7-5.3) m 



