84 PROTECTION OF PLANTS — 1922-23 



u, (37.3 X 4.6 u), and 5 septate, 31.5—52.5 x 3.5—6.1 u, (40.1 x 4.6 u). The pro- 

 duction of deep shades of red by the conidial structures has not been observed, 

 but salmon pink and orange are produced on several media. While it scarcely 

 can be said to bfe scanty the production of aerial mycelium is far from plentiful. 

 Of the various species described in this section, F. lanceolatum appears to agree 

 more closely with No. N than any other. The question again aiises as to 

 whether or not these differences noted above are of specific or even varietal 

 importance, but further study will be necessary before a decision can be 

 reached in this regard. 



Section Martiella. 



6. F. martii phaseoli Burk. — Burkholder (2: 1919). Macroconidia mostly 

 3-septate, (44.5 x 5.1 u), 4 septate (50.09 x 5.3 u), rarely 5 septate, of nearly 

 even diameter throughout, more or less curved near the apex apedcellate. 

 Microconidia rare. Aerial mycelium scanty and white. Spore in pseudo- 

 pionnotes. Chlamydospores terminal or intercalary, single or in short chains. 

 Shades of green ,biue and purple in culture. Causes dry rot of roots of Pha- 

 seolus vulgaris and other Phaseolus spp. 



No. J. agrees with this description in every respect, except that the spores 

 appear to be slightly smaller, 3 septate, 24.5 — 52.0 x 2.6 — 7.0 u (40.5 x 4.9 u) 

 and 4 septate, 40.2 — 56.0 x 4.4 — 6. lu (49.5 x-5.5 u). The character for colour 

 production is not strongly are quite faint. 



7. F. solani (Mart.) Sacc.) — Appel and Wollenweber (1 : 1910) and Sherbak- 

 off (12: 1915). Microconidia always present on aerial mycelium. Macroconidia 

 somewhat broader in upper half of lenght, rounded to slightly constricted apex, 

 non or slightly pedicellate, typically 3 septate, 27.0 — 34.7 x 5.4 — 5.8 u (29.75 

 x 5.5 u), also 4 and 5 septate. Aerial mycelium poorly developped, white to 

 olive buff. Substratum on potato agar oli ve buff with green blue tinge. On 

 tubers of Solatium tuberosum. 



No. L of this series closely with this description. It is an outstanding or- 

 ganism especially in the number of spores produced, masses of spores being deve- 

 lopped on practicelly every meduim used. In some cases the entire surface of the 

 culture is made powdery by the presence of tremendous numbers of spores. 

 They are very uniform in shape and size, measuring, 3 septate, 24.5 — 42.0 x 

 3.5—7.0 u (31.6 X 5.6 u), 4 septate, 31.5—44.0 x 5.2—7.0 u (36.2 x 6.2). 



8. F. lathyri Taub. — Taubenhaus (14: 1914). Macroconidia sickle shaped 

 slightly curved, 3 to 4 septate, mostly 3 septate, latter measuring 15.8 — 30.8 x 

 4.2 — 5.6 u. Microconidia elliptical to oval. Chlamydosphores spherical, 

 thickwalled, spinulate when old, borne singly or in short chains. Causes wilt 

 and root-rot of Lathyrus odoratus. 



