138 



C. D. Sherbakoff 



The measurements of the writer show some deviation from these, but 

 the deviation is small and can be explained entirely by the fact that the 

 writer's measurements were taken from much younger cultures, which 

 usually yield somewhat longer conidia than those produced in old cultures. 



9. Fiisarium falcatum Ap. et Wr. var. fuscum n. var. (Fig. 8; PI. vn, 

 fig. 8) 



Conidia with from ellipsoidal to parabolic dorsal curve, conspicuously 

 broader in the middle, prominently pedicellate, typically 5-septate, 



Fig. 8. — Fiisarium falca'um var. fuscum. a, Pseudopionnotal conidia, b, conidiophores, 

 from 4-days-old culture on hard potato agar; c, intercalary chlamydospores, d, pseudopionnotal 

 conidia, from 10-day s-old culture on hard bean agar; b, cluster of intercalary chlamydospores 

 from 99-days-old culture on potato tuber plug; F, intercalary chlamydospores in long chains, 

 G, conidia with and without chlamydospores, from 176-days-old culture on corn agar; H, young 

 and old chlamydospores, k, sporodochial, l, aerial, conidia, from 79-days-old culture on red 

 raspberry cane plug; m, intercalary and terminal chlamydospores, n, aerial conidia, from 50- 

 days-old culture on rye straw; p, typical conidium from a large sporodochium of 29-days-old 

 culture on hard oat agar 



45x4.6 (40-51 x 4.4-4. 7) m, 3- and 4-septate ones also present, 6- and 

 7-septate rare, 8-septate very rare, typically in conspicuous plecten- 

 chymic or aplectenchymic sporodochia, from light buff and honey yellow 

 to buckthorn and cacao brown, on potato agar rich in glucose; chlamydo- 

 spores intercalary, always present, sometimes by their abundance and 

 color making the entire medium and the aerial mycelium of a dark brown 

 color; aerial mycelium always present, high, from fine to medium fine, 

 more or less loose, hyaline at first, later becoming from tawny olive to 

 brown; color of substratum on agars from hyaline to that of the spores. 



