90 Journal of Agricultural Research voi. xiii.no. 3 



Conidial measurements on various media are as follows : 



FROM AERIAL MYCEUUM ON STEAMED MEtlLOTUS STEM, CULTURE 23 DAYS OLD 



1-septate i per cent, 19 by 3.5 (17 to 23 by 3.4 to 3.8) /it- 

 s-septate 2 per cent, 19 by 3.8 (17 to 25 by 3.4 to 4) n. 

 3-septate 97 per cent, 27 by 4 (22 to 34 by 3.5 to 4.2) m- 



PROM AERIAL MYCELIUM ON STEAMED-POTATO PLUG, CULTURE 63 DAYS OLD 



i-septate i per cent, 18.5 by 3.8 (14 to 25 by 3.5 to 4) m- 

 2-septate 5 per cent, 23 by 4.1 (17 to 28 by 3.5 to 4.5) fi. 

 3-septate 94 per cent, 25 by 4.3 (22 to 32 by 3.5 to 5) At. 

 4-septate rare, only one observed. 



FROM PSEUDOPIONNOTES ON STEAMED-POTATO PLUG, CULTURE 64 DAYS OLD 



i-septate 1.5 per cent, 19 by 3.8 (17 to 22 by 3.5 to 4) fx. 

 2-septate 2.5 per cent, 22 by 4.2 (19 to 26 by 3.8 to 4.5) fx 

 3-septate 96 per cent, 28 by 4.3 (21 to 32 by 3.8 to 4.5) ft. 



PROM SPORODOCHIA ON IRISH POTATO AGAR WITH lO PER CENT OP GLUCOSE, CULTURE 



51 DAYS OLD 



I-septate 3.5 per cent, 16 by 3.2 (12 to 26 by 2.5 to 4) n. 

 2-septate 10.5 per cent, 20 by 3.9 (14 to 30 by 2.8 to 4.5) n. 

 3-septate 86 per cent, 26 by 4.2 (19 to ^:^ by 3 to 4.8) /x- 



PROM SPORODOCHIA ON STRING-BEAN AGAR, CULTURE 6o DAYS OLD 



1-septate rare, only a few measured, 18 by 3 /x. 

 2-septate 2 per cent, 22 by 4 (16 to 29 by 2.8 to 4.5) /i. 

 3-septate 98 per cent, 29 by 4.5 (18 to 36 by 3 to 5) /n. 

 4-septate rare. 



SUMMARY OP THESE MEASUREMENTS 



I-septate up to 3.5 per cent, 18 by 3.5 (12 to 26 by 2.5 to 4) /x. 

 2-septate up to 10.5 per cent, 21 by 4 (14 to 30 by 2.8 to 5) n. 

 3-seotate ud to 08 oer cent. 27 bv 4.2 C18 to ^6 bv -i to k) u. 



2-septate up to 10.5 per cent, 21 by 4 (14 to 30 by 2.8 to 5) 

 3-septate up to 98 per cent, 27 by 4.2 (18 to 36 by 3 to 5) n 

 4-septate rare. 



4-septate rare. 



Fusarium nigrum, n. sp. (PI. A, 1-4; fig. i, J-L). 



Conidia in aerial mycelium, pseudopionnotes, and sporodochia, slightly 

 curved, somewhat abruptly constricted toward the apex, typically 

 broader at the middle and in the upper half of their length, typically 3- 

 and 4-septate, the 3-septate averaging 27.5 by 4.7 (18 to 38 by 3.6 to 

 5.9) fji, the 4-septate averaging 31 by 5 (21 to 43 by 3.6 to 6) ac; aerial 

 mycelium typically well developed, from white to reddish brown, often 

 nearly ox-blood red, the appearance of shades of red and brown signal- 

 izing the development of chlamydospores, on Irish potato agar with 10 

 per cent of glucose, various shades of red and brown, discoloring the 

 media from amber-brown to nearly black; sclerotia-like bodies, consist- 

 ing of masses of mycelium, conidia, and chlamydospores, typically pres- 



