g^ Journal 0} Agricultural Research voi. xiii, no. 2 



FROM AERIAL MYCELIUM ON STRING-BEAN AGAR, CULTt^E 65 DAYS OLD 



I -septate rare. 



2-septate 2 per cent, 22 by 3 (20 to 36 by 2.5 to 3.2) /i. 

 3-septate 30 per cent, 36 by 4 (22 to 44 by 3 to 5) m- 

 1-septate 11 per cent, 37 by 4.2 (22 to 48 by 3 to 5) n. 

 5-septate 55 per cent, 44 by 4-5 (4° to 64 by 3 to 5.3) n. 

 6-septate i per cent, 52 by 4.5 (42 to 68 by 3 to 5.4) m- 

 7-septate i per cent, 56 by 4.5 (42 to 70 by 3 to 5.3) m- 

 8- and g-septate rare. 



SUMMARY AND AVERAGE OF THE PRECEDING MEASUREMENTS 



I septate up to 2 per cent, 19 by 3 (14 to 27 by 2.4 to 3.5 ) m- 



2-septate up to 2 per cent, 20 by 3 (14 to 36 by 2.4 to 3.8 ) m. 



3-septate up to 30 per cent, 34 by 3.5 (22 to 52 by 2.5 to 5) /i. 



4-septate up to 30 per cent, 40 by 3.8 (22 to 60 by 2.8 to 5) ix. 



5-septate up to 57 per cent, 48 by 4.1 (36 to 70 by 2.8 to 5.7) m- 



6-septate up to 10 per cent, 61 by 4.2 (42 to 72 by 3 to 5.4) m- 



Higher septations rare. 



Section Roseum 



Fusarixom acuminatum Ell. and Ev., emend. WoUenw. (3, p. 441; 13, v, 14. p. 1125- 

 1126; 14, p. 142; 21, p. 260-270, pi. 16, fig. G; 22, drawings 166, 168, 170). 



The strain isolated agreed very closely with a culture of the organism 

 furnished by Dr. L. L. Harter. Conidial measurements and habits 

 of growth on various media were very similar. 



Habitat : 



On partly decayed plants, especially on stems, roots, and tubers, also on fruits' 

 Found on Solanum, Ipomoea, Fagus (beechnuts), and Impatiens balsamina in the 

 United States of America (2/, p. 269). 



Isolated six times from Idaho soils, twice from group C, once from 

 sample i, twice from sample 2, and once from sample 3. This organism 

 was cnce isolated from old roots of alfalfa which had been cut back in 



harvesting. 



Section Ferruginosum 



Fusarium sanguineum Sherb. {14, p. J93-196; pi- 3' fig- 7-^i P^- <5, fig. i; 22, draw- 

 ing 165). 

 Identified by comparison with a strain of the organism isolated from 



potatoes by Sherbakoff (culture furnished by Dr. L. L. Harter). 

 Habitat : 

 On rotted tubers of Solanum tuberosum in association with F. lutulatum var. zonalum, 



Ithaca, N. Y. (14, p. 194)- 



Isolated twice from Idaho soils, from sample 3. 



Section Elegans 

 Fusaritun elegantum, n. sp. (PI. A, 5, 6; fig. i, F-I). 



Microconidia usually present in aerial mycelium elliptical to oval, 

 or slightly curved, typically o-septate, often i -septate, the o-septate 

 averaging 7.5 by 2.8 (4.5 to 11 by 2 to 4.5) m, the i-septate averaging 



