Lutman—Life History and Cytology of the Smuts. 1225 
lated than has been commonly supposed. The 1 simple spores 
produced by the breaking up of the mycelium; the multinucle- 
ated mycelium during the entire life cycle; the intercellular 
mycelium without haustoria; the typically four celled promy¬ 
celium, which are all characteristics of the Ustilago group are 
in striking contrast with the elaborate and varied spore-balls; 
the spores produced on lateral branches; the haustoria; the pres¬ 
ence of binucleated cells and the non-septate promycelium which 
are found in the Tilletia, Entyloma, Urocystis division. 
LITERATURE CITED. 
1. Barker, B. T. P., A Conjugating Yeast. Phil. Trans. Roy. 
Soc. London, p. 467. 1901. 
2. Blackman, V. H., On the Fertilization, Alteration of Gen¬ 
erations, and General Cytology of the Uredineae. 
Ann. Bot. 18: pp. 323-873. 1904. 
3. Blackman, Y. H. and Fraser, Helen C., Further studies on 
the Sexuality of the Uredineae. Ann. Bot. 20: pp. 
35-48. 1906. 
4. Brefeld, O., Botanische Untersuchungen iiber Hefenpilze, 
Leipzig. 1883. 
5. -, Untersuchungen aus dem Gesammtgebiete d. Myk- 
ologie. 11, Heft Brand pilze II. Munster. 1895. 
6. -, Hemi basidii, 12. 1895. 
7. Christman, A. H., Sexual Reproduction in the Rusts. Bot. 
Gaz. 39: pp. 267-274. /1905. 
8. -, The Nature and Development of the Primary Ure- 
dospores. Trans. Wis. Ac. Sc. 15: pp. 517-526. 
1907. 
9. -, The Alternation of Generations and the Morphology 
of the Spore-forms in the Rusts. Bot. Gaz. 44: pp. 
81-101. 1907. 
10. Clinton, G. P., Broom Corn Smut. Bull. Ill. Ag. Ex. St., 
47: 373-412. 1897. 
