Fusaria of Potatoes 241 



Syn. Fusarium culmorum W. G. Smith, Dis. Field and Gard. Crops, pp. 208-210, fig. 92. 



1884. 

 Fusarium Schribauxi Delacr., Bui. Soc. Mycol. France 6:99, pi. 15, fig. 1. 1890. Sac- 



cardo, Syll. Fung. 10:726. 1890. 

 Fusarium culmorum (W. Sm.) Sacc, Syll. Fung. 11:651. 1895. 

 Fusarium corallinum Mattirolo (non Sacc), Mem. R. Accad. Sci. 1st. Bologna, ser. 



5:6: 677, figs. 16 and 17. 1897. 

 Fusarium rubiginosum Ap. et Wr., Arb. K. biol. Anst Land- u. Forstw. 8:95-108; 



text fig. 8; PI. I, figs. 31 to 48. 1910. 



Conidia for a greater part of their length of an even diameter, mostly 

 5-septate, 38.5 x 5.85 (37-40 x 5.3-6.2)/-i, somewhat suddenly constricted 

 at apex; pedicellate, of distinctly ochraceous orange color under micro- 

 scope; chlamydospores of more or less common occurrence in mycelium 

 and in conidia, not in long chains; aerial mycelium well developed, high 

 (up to 1 centimeter and more), very loose, at first from white to pinkish 

 cinnamon, and then to jasper and Eugenia red; substratum, on potato 

 agar rich in glucose, of from spectrum red to carmine-pomegranate purple, 

 with more or less brick red color; color of conidia in mass from cinnamon 

 and light ochraceous to mikado brown and warm sepia; sporodochia 

 minute, separate or converging into pseudopionnotes. 



Hab. On cereals and on potato tubers and some other hosts, in Europe 

 and the United States. 



The organism was isolated by the writer from rotted potato tubers, 

 alone and in association with other Fusaria. 



Measurements of conidia on different media are as follows : 55 



On slightly acidified hard potato agar, culture twenty-three days old; 



conidia from pseudopionnotes: 



Conidia: 3-septate, 5 per cent, 33 x 5.9 (21-36 x 4.7-6. 1)/jl 

 4-septate, 10 per cent, 35 x 6.1 (30-37 x 5.7-6.4) /* 

 5-septate, 85 per cent, 37 x 6.2 (32-46 x 5.2-6.5) m 



On red raspberry cane plug, culture seventy-two days old: 

 (1) Conidia from a sporodochium 

 Conidia: 3-scptate, 3 per cent 

 4-septate, 10 per cent 

 5-scptate, 87 per cent, 40 x 6.2 (33-53 x 5.8-7)m 



65 Average of tin- measurements given by Appel and Wollenweber (1910:100) is as follows: 

 Conidia: 0- to 2-septate, about 1 per cent 



3-septate, about 11 per cent, 20 x 5.5^ 



4-septate, about 13 per cent, 27 x 5.7ft 



5-septutc, about 74 per cent, 39 x 6.1/x 



6-septate, about 1 per cent, 45 x 0»* 



