Apr. S, 1918 



Relation of Soil Fungi to Potato Diseases 



87 



ceous, on Irish potato agar with 10 per cent of glucose, a rich amber- 

 brown. 



Habitat: Isolated twice from Idaho soils, once each from sample 5 and 

 group A. When inoculated into Irish potato tubers, a very slight decay 

 resulted. The organism was recovered from the decayed tissue; how- 

 ever, the decay was so slight 

 that it is probable that the 

 organism has no great para- 

 sitic faculty. 



The measurements for the 

 conidia on various media are 

 as follows: 



CONIDIA FROM SPORODOCHIA ON 

 STEAMED POTATO PLUG, CULTURE 

 47 DAYS OLD 



Microconidia: 

 o-septate rare, 6 by 1.8 fi, only a 



few measured. 

 Macroconidia: 



i-septate 7 per cent, 16 by 3 (11 



to 19 by 2 to 3.4) M- 

 2-septate 19 per cent, 18 by 3.3 



(12 to 19 by 2.6 to 3.4) M- 

 3-septate 72 per cent, 24 by 4 



(18 to 34 by 3 to 4) 9;^. 

 4-septate 2 per cent, 30 by 4.4 



(26 to 34 by 3.8 to 5.3) /x. 

 5-septate rare, 29 by 4 m- 



Fig. 2. — M-P, Fusarrum idahoanuin, n. sp. X 500: M, 

 conidia from sporodochia; A^, O, conidia from aerial myce- 

 lium; A^, macroconidia: O; microconidia, o- and i-septate; 

 P, chlamydospores formed in conidia. Q, Fusarium ari- 

 dum, n. sp.: Typical conidial forms from sporodochia and 

 aerial mycelium. X 500. 



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

 GLUCOSE, CU-LTURE 48 DAYS OLD 



Microconidia: 



o-septate 21 per cent, 7 by 2.5 (4 to 11 by 1.5 to 3.4) y.. 

 Macroconidia: 



I-septate 9 per cent, 14 by 2,-Z (n to 17 by 2.2 to 3.7) ;u. 



2-septate 7 per cent, 16 by ^.t, (13 to 19 by 2.5 to 3.8) ii. 



3-septate 56 per cent, 26 by 4 (19 to 38 by 3.5 to 4.9) n. 



4-septate 6 per cent, 30 by 4.3 (24 to 39 by 3.8 to 5.1) At. 



5-septate I per cent, 34 by 4.3 (30 to 39 by 3.8 to 5) ju- 



CONIDIA FROM PSEUDOPIONNOTES ON STEAMED MELILOTUS STEM, CULTURE 57 DAYS 



OLD 



Microconidia: 



o-septate 16 per cent, 6 by 2.2 (5 to 11 by 1.8 to 3.5) ti. 

 Macroconidia: 



I-septate 7 per cent, 14 by 3.2 (9 to 16 by 2.4 to 3.6) fi. 



2-septate 6 per cent, 17 by 3.4 (12 to 21 by 2.6 to 3.8) m- 



3-septate 64 per cent, 28 by 4 (18 to 40 by 3.5 to 5) n. 



4-septate 7 per cent, 30 by 4.2 (22 to 40 by 3.5 to 5) it. 



5-septate rare. 



