216 CD. Sherbakoff 



Hab. On rotted tubers and in discolored fibrovascular bundles of 

 tubers of Solanum tuberosum at Atlanta and Ithaca, New York, and in 

 Louisiana. 



Cultures of this organism on all media may for a long time produce 

 microconidia almost exclusively; but if mature macroconidia from oc- 

 casionally produced sporodochia are planted, macroconidia may be pro- 

 duced again in new cultures in great abundance and on almost any medium. 



Latin description. — Microconidiis gradatim in apicem attenuatis, apice. 

 acutis, pedicellatis plerumque aliquatenus distinctius ad apicem curvatis, 

 medio latioribus vel superiore tertio longitudinis, typice 3-septatis, 34.7 

 x4.4 (30-39.5 X 4. 1-4.6) M, vel etiam 2-5-septatis, plus minusve saepe 

 4-5-septatis; chlamydosporis tantum in mycelio (intercalaribus et ter- 

 minalibus) sed nee maxime frequentibus nee multis prae ceteris sectionis 

 Elegantis speciebus, plerumque tantum unicellularibus; aerio mycelio in 

 duris agaribus semper plene mature, mediocriter alto (2-4 mm.) densoque, 

 saepissime nodes nudo oculo conspicuos formante in hyphalibus apicibus, 

 demum — condicionibus faventibus — multa minuta sporodochia ferente; 

 saepe sclerotiis magnis (usque ad 12 mm. diam.) livido-atris, lucidis, plus 

 minusve rugosis, in tuberibus Solani tuberosi; sclerotiis — si aerio mycelio 

 obsita — minus conspicuis; saepe multis plectenchymicis corporibus 

 (1-3 mm. diam., vel majoribus), verrucoideis, albis vel pallide carneis, vel 

 moles septatorum conidiorum vel nullas tandem ferentibus; conidiis autem 

 in sclerotiis raro ortis; colore conidiorum molis aliquatenus variante, sed 

 plerumque " pinkish buff " (R) tincto; colore substrati juvenis ferme hyaline 

 dein "cinnamon rufous" (R),"deep vinaceous " (R),"dark vinaceous purple" 

 (R). (Vide typicam colorem maturi substrati Tab. i, fig. 12.) 



Hab. In putridis tuberibus et in decoloratis fibro-vascularibus fasciculis 

 tuberum Solani tuberosi, Atlanta et Ithaca, New York, et Louisiana, Amer. 

 bor. 



Measurements of conidia on different media are as follows : 



On red raspberry cane plug, culture fifty-eight days old; conidia from a 



sporodochium : 



Conidia: 1-septate, 1 per cent 

 2-septate, 1.5 per cent 



3-septate, 87 per cent, 30 x 4.4 (21-40 x 3-5.1))li 

 4-septate, 9 per cent, 37 x 4.5 (33-41 x 4.1-5.1)ju 

 5-septate, 1.5 per cent, 40 x 4.6 (35-45 x 4.3-5.1) a* 



