FusAEiA OF Potatoes 



231 



29.1x5.53 (28-32.5 X 5.4-5.8) /x, 3- and 4-septate common, 6- and 

 7-septate very rare; chlamydospores common, mostly in long chains; 

 aerial mycelium well developed; plectenchymic sporodochia (up to 3 

 millimeters in diameter) common; color of aerial mycelium from white 

 to sea-foam yellow and honey yellow; color of substratum, on agars rich 

 in glucose, mostly from chamois to 

 raw sienna and antique brown in 

 some old cultures; color of conidia, 

 in mass, commonly from pinkish 

 buff to pale orange, sometimes from 

 green to blue.^^ 



Hab. On superficial dry rot of 

 tubers of Solanum tuberosum. The 

 organism was isolated from rotted 

 potato tubers received from Edger- 

 ton, Louisiana. 



Latin description. — Conidiis falci- 

 formibus, typice subito apice con- 

 strictis, parum pedicellatis demum 

 papillatis, medio aliquatenus lati- 

 oribus, plerumque 5-septatis, 29.1 

 x5.53 (28-32.5 X 5.4-5.8) M, saepe 

 etiam conidiis 3-4-septatis; conidiis 

 6-7-septatis rarissimis; chlamydo- 

 sporis frequentibus plerumque 

 longis catenulatis; aerio mycelio 

 plene maturo; plectenchymicis 

 sporodochiis (0-3 mm. diam.) fre- 



FiG. 39.— Fusarium subpallidum. a, Sporo- 

 dochial conidia from 70-days-old culture on 

 hard potato agar; b, sporodochial conidia 

 from 35-days-old culture on hard oat agar; 

 c, conidia from a thin slimy layer from 15- 

 days-old culture on slightly acidified hard 

 potato agar; d, conidia from aerial myce- 

 lium from 52-days-old culture on red rasp- 

 berry cane plug; e, conidiophores from 15- 

 days-old culture on slightly acidified hard 

 potato agar; p, chlamydospores from 175- 

 days-old culture on corn agar; g, conidio- 

 phores from 52-days-old culture on red rasp- 

 berry cane plug 



quentibus; aerio mycelio ex albo 

 '■'sea-foam yellow" (R) vel "honey-yellow" (R); substrate, in agaribus 

 perglucosis, plerumque e "chamois" (R) "raw sienna" (R) vel etiam 

 in nonnullis culturis maturis "antique brown" (R); conidiis in totum 

 plerumque e " pinkish buff " (R) pallide "orange" (R) vel interdum e 

 viridi caeruleis. 



53 A very exceptional color for an organism of the section Discolor, and observed only in F. subpallidum. 

 When the conidia are from green to blue in mass, some of them appear under the microscope very densely 

 blue as if stained with methyl blue. The same was observed also in the case of F. coeruleum, F. Martii, 

 and F. Solani var. cyanum. 



