FusARiA OF Potatoes 



143 



12. Fusarium metacroum Ap. et Wr. (Fig. 10; PL vii. fig. 5) 

 Appel, 0., and Wollenweber, H. W., Arb. K. biol. Anst. Land- u. 

 Forstw. 8:132-141; PI. i, figs. Ill to 118; PI. iii, fig. 8. 1910. 



Conidia broad, elfipsoid, more or less pointed at apex, seldom promi- 

 nently pedicellate, typically 5-septate, 53x4.1 (43-65 x 3.8-4.3);u, often 

 3- or 4-septate, seldom 0- to 2-, rarely 6-, exceptionally up to 12-septate, 

 in minute, more or less converging, sporodochia forming exposed pseudo- 

 pionnotes, from Corinthian red to clay color, typically from dragon's- 



FiG. 10. — Fusarium metacroum. Pseudopionnotal conidia: a, from 65-days-old culture on 

 rye grain; b, from 10-days-old culture on hard lima-bean agar; c, from 8-days-old culture on 

 hard lima-bean agar with 2 per cent glucose; d, from 113-days-old culture on potato stem plug; 

 E and F, from 23-days-old culture on red raspberry cane plug; i and j, from 11 -days-old 

 culture on slightly acidified hard potato agar; k, fro7ii 66-days-old culture on rye grain. G and 

 H, Conidiophores from 23-days-old culture on red raspberry cane plug 



blood red to brick red; chlamydospores absent; aerial mycelium typically 

 absent; substratum from madder brown and brazil red to russet color; 

 conidia often densely granulate with indistinct septation. 



Hab. On grains of Triticum vulgaris in Germany and on rotted tubers 

 of Solanum tuberosum in New York State. 



The organism was isolated, together with F. diver sisporum, from a rotted 

 tuber from Long Island. The two fungi were growing together, and 

 in the original culture the mixture appeared to be a pink Fusarium. The 

 fungi were separated by dilution and remained very distinct from each 



