234 CD. Sherbakoff 



On hard lima-bean agar, culture thirty-two days old; conidia from a 

 sporodochium : 

 Conidia: 1-septate, 16 per cent 



2-septate, 7 per cent 



3-septate, 77 per cent, 22.5 x 4.8 (18-25 x 4.7-5.3) m 



4-septate, few, 26 x 5.1 (25-30 x 4.7-5.3) ^ 



On hard oat agar, culture twenty-three days old; conidia from a sporo- 

 dochium : 



Conidia: 3-septate, 90 per cent, 27 x 4.7 (24-34 x 4. 1-4.9) m 

 4-septate, 9 per cent, 29 x 4.9 (24-34 x 4. 1-5.2) ^ 

 5-septate, 1 per cent, 33 x 4.9 (30-40 x 4.8-5.2) m 



Average of the above measurements: 

 Conidia: 0-septate, rare 



1-septate, 4.5 per cent, 17.5 x 4.7/1 

 2-septate, 2 per cent 

 3-septate, 61 per cent, 25.25 x 4.9/x 

 4-septate, 20 per cent, 27.5 x 5.1^ 

 5-septate, 12.5 per cent, 29.5 x 5.3/i 



47. Fusarium clavatum n. sp. (Figs. 1ri and 40; PI. iii, figs. 11 and 12; 

 PL VII, fig. 2) 



Conidia sickle-shaped, typically distinctly broader in upper third of 

 their length, somewhat suddenly constricted at the apex, slightly pedicel- 

 late, mostly 3- to 5-septate, 5-septate measuring 36.2 x 5.05 (32-46 x 

 4.8-5.2) z^; aerial mycelium of a medium development (2 to 4 millimeters 

 high, more or less loose) to nearly absent, and then substratum covered 

 with pseudopionnotes; chlamydospores scant, not in long chains; color 

 of aerial mycelium and substratum from white to light pink and that shown 

 on Plate iii, figures 11 and 12; color of pseudopionnotes from pale pink 

 to deep olive-buff and chocolate brown (PI. iii, fig. 11); color of sporo- 

 dochia bright orange (PI. vii, fig. 2). 



Hab. On rotted tubers of Solanum tuberosum, together with F. coeru- 

 leum, Castile, New York. 



Latin description. — Conidiis falciformibus, typice distincte latioribus in su- 

 periore tertio longitudinis, apice aliquatenus subito constrictis, parum pedi- 

 cellatis, plerumque 3-5-septatis, 5-septatis, 36.2x5.05 (32-46x4.8-5. 2) /x; 

 aerio mycelio mediocriter maturo (2-4 mm. alt., plus minusve laxo) 



