142 C. D. Sherbakoff 



V. Section Roseum Wr. (emended), Phytopath. 3:32, fig. 1 n, 1913 

 Conidia broad ellipsoid, typically of an even diameter for a consider- 

 able part of their length, comparatively narrow (from 3.6 to 4.3^ in aver- 

 age diameter), always very gradually attenuate toward both ends, conidia 

 of all fruiting forms of the same shape and type; true chlamydospores 

 always absent; on agars rich in glucose, from honey yellow and morocco 

 red to Eugenia red, sometimes nearly hyaline. 



11. Fusarium acuminatum Ell. et Ev. emend. Wr. 



Cf. Wollenweber, H. W., Journ. Agr. Research 2:269-270, PL xvi, 

 fig. G. 1914. Fusarium acuminatum Ell. et Ev., Proc. Acad. Sci. Phila. 

 1895:441. Saccardo, Syll. Fung. 14:1125-1126. 1899. Wollenweber's 

 diagnosis (page 269 of reference cited) is as follows: 



" Conidia, scattered, in sporodochia or in pionnotes, orange in mass. 

 Conidia average as follows: 5-septate, 40 to 70 by 3 to 4.5At; 4-septate 

 (less common), 30 to 60 by 3 to 4.5/i; 3-septate, 20 to 45 by 2.75 to 4.25)U. 

 Conidia of 0-, 1-, 2-, 6-, and 7-septations are occasionally found. Sub- 

 normal small conidia may be mistaken for conidia of the section Discolor, 

 but normal sporodochia develop on repeatedly whorl-like branched conidio- 

 phores, giving the characteristic conidia of the section Roseum. The 

 conidia show in side view hyperbolic or parabolic curves, in contrast 

 to Fusarium metacroum App. and Wollenw., the conidia of which are 

 as a rule more nearly straight. Blue globose sclerotia, 50-70ju thick, 

 occur and form a striking contrast to the carmine plectenchymatic thallus 

 on starchy media, such as steamed potato tubers. Both blue and car- 

 mine are basic modifications of the fungus, while yellow (on rice) is the 

 acid one, turning blue to purple violet with the addition of an 

 alkali. 



" Habitat. Occurs on partly decayed plants, especially on stems, 

 roots, and tubers, also on fruits. Found on Solanum, Ipomoea, Fagus 

 (beech nuts), and Impatiens balsamina in the United States of America." 



Ellis and Everhart's description is incomplete, but Wollenweber says 

 (on page 270 of reference cited) that he " found this fungus so widely 

 distributed on potato stems in the New England States that he feels 

 justified in identifying it as Fusarium acuminatum." The writer did 

 not study this fungus. 



