Fusaria of Potatoes 131 



On same culture as above but from an old part of the colony growth: 

 3-septate, 70 per cent, 41 x 6 (36-46 x 5.2-7.6) n 



Average of the above measurements: 

 Conidia: 0-septate, 3 per cent, 15 x 5/x 



1-septate, 23 per cent, 21.3 x 5.4ju 

 2-septate, 8 per cent, 26 x 5.45/i 

 3-septate, 66 per cent, 34.7 x 5.9// 



III. Section Eupionnotes Wr., Phytopath. 3:38, 206, 219 



Conidia dorsiventral, apedicellate, nearly cylindrical for the largest 

 part or slightly broader toward apex, typically 3-septate, in true pionnotes; 

 terminal and intercalary chlamydospores present. Differs from all the 

 other sections of Fusaria by true pionnotal fruiting form. 



5. Fusarium udum (Berk.) Wr. 



Syn. Fusisporium udum Berk., Ann. Mag. Nat. Hist. 6:438, PI. xiv, fig. 28. 1841. 

 Pionnotes uda (Berk.) Sacc, Syll. Fung. 4:726. 1886. 



Cf. Wollenweber, Phytopath. 3:38 (footnote), 219 (key), PI. xxi, figs. 

 r and s. 



According to Wollenweber's data and figures, the conidia are dorsiventral 

 with somewhat rounded apex, apedicellate, typically 3-septate, about 

 33-45 x 3.5-4/x, sometimes 4- or 5-septate; terminal chlamydospores 

 present. 



Hab. On cut surfaces of oak, elm, and other trees, also on Solanum 

 tuberosum, on tulip bulbs, and in the soil. 



6. Fusarium udum (Berk.) Wr. var. Solani n. var. (Figs. 1g and 5) 

 Conidia dorsiventral, usually somewhat broader toward the slightly 



rounded apex, apedicellate, typically 3-septate, 30.2 x 4.27 (25-34 x 4-4.5) /z, 

 non- to two-septate very rare when mature, 4- and 5-septate rare, of from 

 light vinaceous cinnamon to orange-cinnamon hues on agars rich in glucose; 

 chlamydospores usually found only in old cultures, terminal and inter- 

 calary, in conidia, in the tips of sterigmata, and in mycelium, often of 

 dense orange color, 0-septate, 6 x 5.5/x; aerial mycelium present only near 

 margin of colony growth, very loose, short, hyaline; substratum colorless 

 or approaching the color of the conidia. 



