REED: SPECIALIZATION OF PARASITIC FUNGI 403 
The general occurrence of specialized races of parasitic fungi makes 
their study particularly important. It is especially desirable to 
know the exact host relations of the different races as well as to deter- 
mine whether the races are stable and constant or whether they are 
capable of a change of virulence and consequently able to extend their 
host range. 
on! 
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N 
iy 
20. 
21. 
22. 
23. 
24. 
25. 
26. 
CA CR Cone ONC ee 
LITERATURE CITED 
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— Cultures of Uredineae in 1902. Bot. Gaz. 35: 10-23. 1903. 
—— Cultures of Uredineae in 1903. Journ. Mycol. 10: 8-21. 1904. 
— Cultures of Uredineae in 1904 Journ. Mycol. 11: 50-67. 1905. 
—— Cultures of Uredineae in 1905. Journ. Mycol. 12: 11-27. 1906. 
— Cultures of Uredineae in 1906. Journ. Mycol. 13: 189-205. 1907. 
— Cultures of Uredineae in 1907. Journ. Mycol. 14: 7-26. 1908. 
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. — Cultures of Uredineae in 1910. Mycologia 4: 7-33. 1912. 
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IQI5. 
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