82 



Journal of Agricultural Research 



Vol. XIII, No. 2 



Studied by Sherbakoff (14, p. 126) though no authentic culture was 

 available for comparison. 



Habitat : In tubers and stems of Solanum tuberosum and in greenhouse 

 soil, New York {14, p. 126). Isolated once from Idaho soils from sample 2. 



Fusarium dimerum Penz (j, p. 37, fig. 2-3; 8, p. 484; 12, p. 566; 13, v. 4, p. 704; 14, 

 p. 127; 22, drawings 85-gi). 



The organism isolated differed slightly from the original description 

 by Penzig (8, p. 484), but the differences were not considered important 



enough to justify the es- 

 tablishment of a new spe- 

 cies. On comparing it with 

 a strain isolated from pota- 

 toes by Sherbakoff {14, p. 

 i2y), it was found to be 

 identical, except that the 

 conidiawere slightly broad- 

 er and longer and the 

 growth on most media 

 somewhat more rapid. In 

 comparison with drawings 

 of F. dimerum made by 

 Wollenweber {22) , the con- 

 idia appeared to be ident- 

 ical with those of several 

 European strains of the or- 

 ganism. The organism iso- 

 lated is briefly described as 

 follows: Conidia lunar, 

 slightly pedicillate, typi- 



FiG. i.—A-E, Fusarium lanceolatum n. sp. X soo: A, typical cally I -Septate, oftcn O-SCp- 



conidal forms sporodochia and pseudoUionaotes; fi, short con- cr»rnf.«-i'm<-G o dpnl-flfp 



idia, some with swollen, barrel-like cells common on media *-'^'-*^» bometiuicb ^-scpLdLC, 



containing an abundance of moisture; C, D, Chlamydospore very rarely 3-Septate (only 



in chains: E, Germinating conidium. F-l. Fusarium ele- „i «- „ „:4:.,,^ ,rr„^ 



,antum, n. sp. X500: F, typical conidia from sporodochia; OUC 3-Septate COnidmm WaS 



G, H, conidia from aerial mycelium; G, macroconidia; H, obsCrved) , bornC siugly On 



microconidia; /, chlamydospores in chains. J-L, Fusarium , .,.„„„^1 :.,--„ -P^,-,^;«rr ^« 



n,gum. n. sp. X500: /, typical conidia Irom sporodochia and the myCChum, formmg, On 



aerial mycelium; K, L. chlamydospores in chains and groups. mOSt media, a morC Or IcSS 



continuous slimy layer, from slightly hyalin to light cinnamon buff ,^ on 

 String-bean agar and steamed-potato media, a tufted growth from white 

 to pink and cinnamon buff. The conidial measurements are as follows : 

 o-septate, 10 to 17 by 2.5 to 3.8 m- 



I -septate, 11 to 20 by 2.5 to 4.5 ju- 



2 -septate, 12 to 20 by 3 to 4.6 fx. 



' Colors given in this paper are according to Ridgway. Robert, color standards and cotOR nomsn- 

 CtATURB. 43 p., 53 col. pi. Washington, D. C, 1912. 



