FusARiA OF Potatoes 



191 



potato agar rich in glucose, at first pink, then ochraceous tawny, and 

 finally ferruginous and Hay's russet. 



Hab. On rotted tubers of Solanum tuberosum, Long Island, New York, 

 on Lycopersicum esculentum, Virginia, and on Panax quinquefolium, New 

 York State. 



Latin description. — Conidiis plene maturis — sporodochiis minutis vel 

 mediocribus (usque ad 2 mm. diam.) vel pseudopionnotibus — maxime 

 gradatim in apicem acutis, distincte pedicellatis, plus minus ve valide 

 arcuatis, latioribus in medio vel in inferiore tertio longitudinis, typice 3-5- 

 septatis; 5-septatis plerumque 45.3x4.2 (28-53 x 4. 1-4.2) ju; conidiis 

 in aerio mycelio — interdum etiam ex sporodochiis in vetustissimis agaris 



Fig. 24. — Fusarium ferruginosum. a, Pseudopionnotal conidia from 10-days-old culture 

 on hard lima-bean agar: b, sporodochial conidia from 1 30-day s-old culture on hard lima-bean 

 agar with 2 per cent glucose; c, aerial conidia from H-days-old culture on slightly acidified 

 hard potato agar; d, pseudopionnotal conidia from 3-days-old culture on hard Nina-bean agar; 

 E, aerial conidia, f, chlamydospores, from 35-days-old culture on corn meal; G, conidiophores 

 from 3-days-old culture on hard lima-bean agar 



culturis crescentibus — typice 3-septatis, 30.8 x 3.8/x, plerumque apedicel- 

 latis; conidiis ex albido pallide rubellis, gilvis atque vinaceosis; chlamy- 

 dosporis intercalaribus semper in mycelio praesentibus, saepe plurimis, 

 longis catenulatis longis uveosisque; aerio mycelio semper plene maturo, 

 alto, semper densissimo, primum albo, dein rubello demum ferrugineo, 

 quern colorem magnae moles chlamydosporum ortae efficiunt; substrato 

 in agare Solani tuberosi glucoso, primum rubello, dein " ochraceous- tawny " 

 (R), demum ferrugineo et "Hay's russet" (R). 



Hab. In tuberibus putridis Solani tuberosi, Long Island, New York, 

 in Lycopersico esculento, Virginia, et in Panaci quinquefolio. New York, 

 Amer. bor. 



Measurements of conidia on different media are as follows: 



