264 



C. D. Sherbakoff 



The greatest septation observed was in a culture fifteen days old on oat 

 grains. This was a 9-septate conidium measuring 39 x 5.2/i. 



Average of the above measurements: 

 Conidia: 0-septate, about 4 per cent, 16 x 4.7^ 



1-septate, about 6 per cent, 21 x 4.7jLt 



2-septate, about 5 per cent, 25 x 5.3;u 



3-septate, about 78 per cent, 33.3 x 5/i 



4-septate, about 4.5 per cent, 39 x 5.26/i 



5-septate, about 2 per cent, 55 x 5.5^t 



6- and 7-septate, about 0.5 per cent, 58 x 5.6ju 

 Appel and Wollenweber's measurements for 3-septate conidia average 

 36x5.25 (31-40 x4.5-5.5)m 



RAMULARIA (Unger) Fries (Fig. 1, a to c) 

 Unger, F., Exantheme der Pflanzen, page 169. 1833. Fries, E. 



M. 



Summa vegetabilium Scandinaviae, page 493. 1849. 

 Cf. Wollenweber, H. W., Phytopath. 3 : 33. 1913. Wol- 

 lenweber, H. W., Phytopath. 3 : 207-211. 1913. 



Differs from Fusarium mainly by nearly cylindrical, 

 apedicellate conidia, with rounded apex; plectenchymic 

 stromata flat to well-developed, wartlike, short 

 column-like structures typically present; conidia borne 

 on conidiophores on aerial mycelium, or on plecten- 

 chymic substratum; microconidia (that is, a distinct, 



FiGAQ.—Ramularia abbreviated type of conidia) absent. 

 eudidyma. a, Co- 



1. Ramularia eudidyma Wr. (Figs. 1b and 49) 



Wollenweber, H. W., Phytopath. 3:221-222, PI. xxi, 



fig. c. 1913. 



Co- 

 nidia from aerial 

 mycelium from 55- 

 days-old culture on 

 red raspberry cane 

 plug: B, sporodo- 

 chial conidia from 

 1 53-day s-old cul- 

 ture on hard lima- 

 hean agar; c, co- 

 nidia from aerial 

 mycelium from. 25- 

 days-old culture on 

 slightly acidified 

 hard potato agar 



Syn. Fusisporium didymum Hartig. 1846. 



Fusarium didymum (Hart.) Lindau. 1909. 

 Fusarium didymum (Hart.) Ap. et Wr. 1910. 

 Ramularia didyma (Hart.) Wr. 1913. 



Conidia nearly cylindrical, with both ends rounded 

 or basal ends sometimes papillate, mostly 1-septate, 

 23x4.87 (21-26 X 4.7-5) m;58 0- to 2-septate conidia 



5S According to Wollenweber'3 data (1913 c 

 29 X 4.25-5. 5) M. 



234) the average size of 1-septate conidia is 26.4 x 5 (21- 



