154 CD. Sherbakoff 



4-septate, 4 per cent 



5-septate, 81 per cent, 50.5 x 4.5 (38-60 x 3.9-4.8)/* 

 6-septate, 4 per cent, 56 x 4.7 (48-64 x 4.4-5.2) /z 

 7-septate, rare, 62 x 5.2/i (only one measured) 



On the same medium as above, culture sixteen days old; conidia from 

 aerial mycelium and indistinct pseudopionnotes : 

 Conidia: 1-septate, 1 per cent, 18 x 3.5/x (only a few measured) 

 2-septate, 1 per cent, 24 x 4/* (only a few measured) 

 3-septate, 12 per cent, 33 x 4 (21-44 x 2.9-4.8) m 

 4-septate, 6 per cent 



5-septate, 71 per cent, 50 x 4.3 (38-62 x 3.5-4;7)m 

 6-septate, 7 per cent, 60 x 4.7 (55-64 x 4.5-4.8) )Lt 

 7-septate, 2 per cent, 62 x 4.7 (59-65 x 4.4-4.8)/* 



Average of the above measurements: 

 Conidia: 1-septate, less than 1 per cent, 18 x 3.5/e 

 2-septate, 2 per cent, 24 x 4.0/x 

 3-septate, 20 per cent, 36 x 4.0/i 

 4-septate, 12 per cent 

 5-septate, 63 per cent, 50 x 4.3/t 

 6- and 7-septate, 3 per cent, 68 x 4.8/i 



F. effusum, especially in its sporodochial stage, much resembles the fol- 

 lowing other species: F. suhulatum, F. lucidum, F. biforme, F. diver- 

 sis'porum. From F. suhulatum it can be at once distinguished by the diam- 

 eter of the conidia and by the larger size of sporodochia.^'' From F. 

 lucidum it differs primarily by the common presence of 6- and 7-septate 

 conidia, which are absent in F. lucidum, and by denser red substratum than 

 that of the latter species. From F. biforme it differs mainly by absence 

 of the long, 9— or more septate, conidia in pseudopionnotes, and also by 

 absence of arthrosporial conidial form, the pluriseptate conidia and arthro- 

 sporial conidia on aerial mycelium being more or less common in F. bi- 

 forme. From F. diversisporum it differs by absence of arthrosporial co- 

 nidia, which are typically produced on aerial mycelium of F. diversisporum. 



■"' Sporodochia of F. suhulatum as a rule are small, but on whole steamed potato tubers they may be as 

 large as those of F. effusum. 



