Apr. 8, 1918 Relation of Soil Fungi to Potato Diseases 83 



The average proportion of i -septate conidia observed was 93 per cent ; 

 of 2-septate, 6 per cent; of o-septate, i per cent (in mature cultures, 15 

 to 30 days old). 



Habitat: On tubers and stems of Solanum tuberosum in Germany (z), 

 and in Minnesota {14), on fruits of Citrus medica in Italy (8). Isolated 

 once from Idaho soils from sample i . 



Section Gibbosum 

 Fusariiim lanceolatum, ti. sp. (PI. A, 7, 8; fig. i, A-E). 



Conidia typically in pseudopionnotes, but also in aerial mycelium and 

 sporodochia from nearly straight to strongly curved, usually distinct!}' 

 pedicillate, typically 3-, 4-, and 5-septate, 6- and 7-septate common, 

 higher septations rare, the 3-septate averaging 34 by 3.5 (22 to 52 by 2.5 

 to 5) n, the 4-septate, 40 by 3.8 (22 to 60 by 2.8 to 5) n, and the 5-septate, 

 48 by 4.1 (36 to 70 by 2.8 to 5.7) n; aerial mycelium scantily developed, 

 white when present, to dark maroon when well filled with conidia; 

 sporodochia and pseudopionnotes ochraceous-orange at first, becoming 

 dark maroon, often brighter shades of red to Brazil red; substratum o:i 

 steamed potato often a bright orange, yellow modification on rice becom- 

 ing brown with age; chlamydospores singly and in chains. 



Habitat: Isolated twice from Idaho soils, once each from samples i 

 and 2. When inoculated into potato tubers, no decay resulted. 



The conidial measurements on various media are as follows : 



From pseudopionnotes on steamed-potato plug, culture 43 days old 



i-septate rare, 20 by 3 m, only a few measured. 

 3-septate 23 per cent, 37 by 3.6 (28 to 50 by 3 to 4.3) //. 

 4-septate 30 per cent, 48 by 4.2 (34 to 57 by 3 to 5) /u. 

 5-septate 44 per cent, 53 by 4.4 (43 to 68 by 3 to 5.7) m- 

 6-septate 3 per cent, 62 by 4.8 (50 to 72 by 4.3 to 5) fi. 

 7-septate rare, 65 by 4.5 m- 



From pseudopionnotes on steamed melilotus stem, culture 56 days old 



i-septate 2 per cent, 19 by 3 (14 to 27 by 2.4 to 3.5) ju- 

 2-septate 2 per cent, 20 by 3 (14 to ^^ by 2.4 to 3.6) fj,. 

 3-septate 20 per cent, 32 by 3 (26 to 48 by 2.5 to 3.8) fi. 

 4-septate 22 per cent, 38 by 3.3 (28 to 60 by 2.8 to 4.8) m- 

 5-septate 42 per cent, 48 by 4 (38 to 64 by 3 to 5) m- 

 6-septate 10 per cent, 58 by 4 (44 to 70 by 3 to 5) /u. 

 7-septate 2 per cent, 64 by 4.2 (56 to 72 by 3.5 to 5) n. 



FROM PSEUDOPIONNOTES ON POTATO AGAR (lO PER CENT GLUCOSE), CULTURE 6o DAYS 



OLD 



I-septate 0.4 per cent, 18 by 3 (14 to 24 by 2.5 to 3.5) n. 

 2-septate 1.5 per cent, 19 by 3 (15 to 26 by 2.5 to 3.8) p. 

 vseptate 20.0 per cent, 33 by 3.4 (22 to 52 by 2.8 to 4) fi. 

 t-septate 20.5 per cent, 37 by 3.5 (28 to 60 by 3 to 4) fi. 

 5-septate 57 per cent, 47 by 3.5 (38 to 70 by 2.8 to 4) fj.. 

 6-septate 0.2 per cent, 56 by 3.5 (42 to 72 by 3 to 4.2) fi. 

 7-septate 0.4 per cent, 60 by 3.6 (42 to 76 by 3 to 4.2) fi. 



