186 C. D. Sherbakoff 



6-septate, 1.5 per cent, 65x4.1 (60-80 x 3.7-4.4) m (only four 



measured) 

 7-septate, 1.5 per cent, 67x4.5 (62-72 x 4.1-5.3) m (only four 



measured) 



On wheat grain culture sixteen days old; conidia from aerial mycelium: 



(1) Sporotrichial form 



Conidia: 0-septate, 70 per cent, 11.4 x 5.6 (8-16 x 4-6.5) /x 

 1-septate, 30 per cent, 14 x 5.6 (11-17 x 4.8-6)/z 



(2) Sickle-shaped form 



Conidia: 0-septate, 9 per cent, 10 x 3.2/i 



1-septate, 68 per cent, 20x3.8 (12-24 x 3-4.2) M 



2-septate, 5 per cent 



3-septate, 18 per cent, 32 x 4.3 (24-44 x 3.9-4.7) y. 



Average of the above measurements : 



(1) Sporotrichial form 



Conidia: 0-septate, 83 per cent, 10.5 x 6ju 

 1-septate, 17 per cent, 14 x 5.4/* 

 2- and 3-septate, rare to very rare 



(2) Sickle-shaped form 

 Conidia: 0-septate, 10 per cent 



1-septate, 31 per cent, 10x3.1^ 



2-septate, 2 per cent 



3-septate, 36 per cent, 30.4 x 3.8/x 



4-septate, 6 per cent 



5-septate, 13 per cent, 50.5 x 4.3ju 



6- to 10-septate, 2 per cent, about 67 x 4.5/t 



VIII. Section FERRUGINOSUM n. sec. 



Conidia mostly of an intermediate type, between that of section 

 Gibbosum and section Roseum, 3- to 7-septate; intercalary chlamy do- 

 spores typically present. Substratum and basal layer of aerial mycelium 

 varying from white when young to different hues of red at maturity. 



27. Fusarium arcuosporum n. sp. (Figs. lBiand 23; PI. n, figs. 7 and 8; 

 PI. vi, fig. 10) 



Conidia very gradually pointed toward apex, distinctly and often 



