86 Journal of Agricultural Research voi. xiii, no. 2 



CONIDIA FROM SPORODOCHIA ON STRING-BEAN AGAR, CULTURE 25 DAYS OLD 



3-septate 77 per cent, 34 by 4 (26 to 41 by 3.8 to 4.8) /x. 

 4-septate 23 per cent, 34 by 4.2 (30 to 46 by 3.8 to 5) /x- 

 5-septate rare, only two observed, averaging 41 by 4.5 At. 



CONIDIA FROM AERIAL MYCELIUM ON POTATO AGAR, WITH lO PER CENT OF GLUCOSE 

 ADDED, CULTURE 26 DAYS OLD 



Microconidia: 



c-septate 84 per cent, 7 by 3.5 (4.5 to 11 by 2.5 to 4.5) n. 



i-septate 7 per cent, 11 by 3.5 (xo to 17 by 3 to 4.5) m- 

 Macroconidia: 



2-septate i per cent, 23 by 3.8 (19 to 26 by 3.4 to 4.5) m- 



3-septate 8 per cent, 26 by 4 (19 to 29 by 3.8 to 5) m- 



4-septate rare. 



The conidia are rarely normal on this medium. Conidia from sporodochia and 

 pseudopionnotes are usually swollen, with barrel-shaped cells. The sporodochia, 

 often converging into a pseudopionnotal layer, soon become overgrown with mycelium 

 containing a very high percentage of microspores. 



SUMMARY AND AVERAGE OF THE FOREGOING MEASUREMENTS 



Microconidia: 



o-septate up to 84 per cent, 7.5 by 2.8 (4.5 to 11 by 2 to 4.5) /*. 



i-septate up to 11 per cent, 12 by 3.2 (10 to 17 by 2.8 to 4.5) /*. 

 Macroconidia: 



o-septate considered immature. 



I-septate rare, 20 by 4 (19 to 26 by 3.5 to 4.5) ju. 



2-septate up to 5 per cent, 20 by 4 (15 to 26 by 3.4 to 5) /x- 



3-septate up to 68 per cent, 29 by 4.2 (19 to 41 by 3.5 to 5.5) y.. 



4-septate up to 48 per cent, 33.4 by 4.6 (26 to 46 by 3.6 to 5.7) ii. 



5-septate rare, 35 by 5 (28 to 41 by 4.2 to 5.7) n. 



It will be seen from the description that this organism lacks one of the 

 typical characters of the section Elegans — namely, the characteristic 

 vinaceous hues. This color reaction appears with this organism only on 

 media rich in glucose but other characters are such that the writer feels 

 justified in placing it in this section. 



Fusarium idahoanum, n. sp. (PI. B, 4-6; fig. 2, M-P.) 



Microconidia always present in aerial mycelium and often in sporo- 

 dochia and pseudopionnotes elliptical to oval, sometimes slightly curved, 

 o-septate, averaging 7 by 2.4 (4 to 12 by 1.5 to 3.5) /x; macroconidia 

 slightly curved, typically gradually attenuated toward the apex, slightly 

 pedicillate, typically 3-septate, averaging 25 by 4.1 (18 to 40 by 3 to 5) /x, 

 I-, 2-, and 4-septate common, 5-septate rare; aerial mycelium typically 

 well developed, white at first, becoming pink to mallow-purple, often 

 orange-pink when well filled with conidia, frequently developing shades 

 of yellow on Irish potato agar vrith 10 per cent glucose; sporodochia and 

 pseudopionnotes, light orange to orange; substratum (steamed rice) 

 yellow to shades of brown, sometimes, in places, shades of pink to vina- 



