TAXONOMIC CHARACTERS OF ALTERNARIA AND MACROSPORIUM 475 
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EXPLANATION OF PLATES XIX AND XX 
Plate XIX 
All drawings were made with camera lucida to scale shown on the plates. 
1. Alternaria hrassicae var. nigrescens on leached agar. 
2. Alternaria brassicae var. nigrescens spores showing stages in secondary 
development. 
3. A. solani from Datura on leached sugar. 
4. A. solani from Datura, spores from bean agar culture. 
5. A. solani from potato on leached agar. 
6. A tenuis spores two weeks and six weeks old showing secondary development 
due to age. 
7. A. tenuis on leached agar. 
8. A. dianthi on leached agar. 
9. A. dianthi spores from colony on acid agar. 
10. A. dianthi spores from colony on bean agar at 10°, showing enlarged size 
and secondary development. 
11. A. fasciculata on leached agar. 
12. A. fasciculata spores showing echinulation. 
13. A. fasciculata showing development of a spore. 
14. A. hrassicae var. microspora on leached agar. 
