126 



CD. Sherbakoff 



slow-growing fungi, with hyaline or nearly hyaline mycelium and from 

 hyaline to orange-colored conidia. They appear to differ in many ways 

 from typical Fusaria, but the differences are not sharp enough to warrant 

 transferring them into another genus. 



1. Fusarium affine Faut. et Lamb. (Figs. Id and 2) 

 Fautrey, F., and Lambotte, E., Especes nouvelles ou rares de la Cote-d'Or, 

 Rev. Myc. Fr. i8:68. 1896. Saccardo, Syll. Fung. 14: 1125. 1899. 



Conidia straight, somewhat dorsiventral near apex, apedi- 

 cellate, typically 1-septate, 10.2 x 2.8 (9-11.4 x 2.6-3) /x, 

 usually in a continuous smooth or slightly roughened, 

 slimy layer, from hyaline to pale salmon-colored on a 

 glucose agar; conidiophores from simple to sparingly 

 branched, septate; mycelium hyaline; no chlamy do- 

 spores. 



Hab. In tubers and stems of Solanwn tuberosum, in 

 greenhouse soil. New York. 



This organism was repeatedly isolated from various 

 sources such as discolored fibrovascular bundles of potato 

 tubers, from the base of wilted potato stems, and from 

 soil. Its size is exactly the same as that given by Wol- 

 S*" M^'i lenweber (1913 c:229) for the conidial stage of Myco- 

 ture on slightly sphaerella Solani (E. et E.) Wr. Wollenweber's illustra- 

 acidified potato tions (Plate XXI, fig. n) are also much the same, and he 



agar; B, conidia ., _, „ t-i, .t i ,^ ■ ^■ i , 



from 7-days-old considers F. affine t aut. et Lamb, as the conidial stage. 

 -plate culture on 'pj^g strain studied did not show any perfect form in cul- 



hard potato ^ ^ ^ • c ^ 1 



agar; c, conidia ture, although it was gi'own tor more than a year and on 

 from 74-days- various media. This organism can be at once distinguished 



old CllltXlTB 071 



red raspberry from all the other Fusaria by its minute, 1-septate, 

 nearly straight conidia and its inconspicuous, slow growth. 

 For a fuller presentation of its septation and size the 

 following detailed measurements are given: 



Fig. 2. — Fusa 

 rium affine. a, 



cane, plug; d, 

 conidia from J^- 

 days-old culture 

 on hard lima- 

 bean agar; e, 

 conidiophores 

 from various 

 media; f, co- 



nidia from 5- Conidia 



days-old culture 

 on nutrient agar 



On red raspberry cane plug, culture seventy-four days 

 old: 



0-septate, 45 per cent, 7 x 2.2 (3.5-9 x 1. 7-2.6) /i 

 1-septate, 55 per cent, 9 x 2.6 (6-12 x 2-3) ^t 



