476 
JOHN A. ELLIOTT 
15. A. hrassicae var. microspora on bean agar, 10°, showing reduced size of 
spores and lack of color. 
16. Macrosporium sarcinaeforme on leached agar. 
17. M. sarcinula on leached agar. 
Plate XX 
1. Mycelium of A. solani from potato; a, reaction to bacterial influence; h, 
normal. 
2. Mycelium of A. hrassicae var. microspora; a and h as in No. i. 
3. Mycelium of A. hrassicae var. nigrescens; a and h as in No. i, 
4. Mycelium of A. solani from Datura; a and h as in No. i. 
5. Mycelium of A. tenuis; a and h as in No. i. 
6. Colony of A . hrassicae var. microspora showing reaction to Colony of B. x. 
7. A. iridicola on leached agar. 
8. A. sonchi conidiophores and spores on Lactuca canadensia. 
9. A. sonchi conidiophores and spores on leached agar. 
10. Spores of A. solani from Datura; A, from Datura leaf spot; B, from potato 
leaf spot; C, from tomato leaf spot (artificial inoculations). 
