46 
LOUIS OTTO KUNKEL 
8. Hoffmann, A. W. H. Zur Entwicklungsgeschichte von Endophyllum sempervivi. 
Centralbl. f. Bak. 2 abt. 32: 137-158. 1912. 
9. Holden, R. J., and Harper, R. A. Nuclear divisions and nuclear fusion in 
Coleosporium Sonchi-Arvensis Lev. Trans. Wis. Acad. Sci. 14: 63-77. ^9^3- 
10. Kunkel, O. The production of a promycelium by the aecidiospores of Caeoma 
nitens Burrill. Bull. Tor. Bot. Club 40: 361-366. 1913. 
11. Kurssanow, L. Zur Sexualitat der Rostpilze. Zeits. Bot. 2: 81-93. 1910. 
12. Maire, R. L'evolution nucleaire chez les Endophyllum. Jour, de Bot. 14: 
369-382. 1900. 
13. Miiller, W. Der Entwicklungsgang des Endophyllum Euphorbiae silvaticae 
(DC.) .Winter und der Einfluss dieses Pilzes auf die Anatomic seiner Nahr- 
pflanze Euph. Amygdaloides. Centralbl. f. Bak. 2 Abt. 20: 333. 1908. 
14. Newcombe, F. C, and Galloway, B. T. Perennial mycelium of the fungus of the 
blackberry rust. Jour. Mycol. 6: 106-107. 1890. 
15. Nypels, P. La germination de quelque ecidiospores. Ann. Soc. Beige de Micros. 
22: loi-iii. 1898. 
16. Olive, E. W. Sexual cell fusions and vegetative nuclear divisions in the rusts. 
Ann. Bot. 22: 331-360. 1908. 
17. Sappin-Trouffy, P. Recherches histologiques sur la famille des Uredinees. Le 
Botaniste 5: 59-244. 1896. 
18. Tranzschel, W. Culturversuche mit Caeoma interstitiale Schlechtd. ( =^ C. 
nitens Schw.). Hedwigia 32: 257-259. 1893. 
19. Tulasne, L. R. Second memoire sur les Uredinees et les Ustilaginees. Ann. 
Sci. Nat. IV. 2: 77. 1854. 
20. Werth, E. Zur Kenntniss des Sempervivum-Rostes. Centralbl. f. Bak. 2 Abt. 
36: 395-408. 1913- 
EXPLANATION OF PLATE HI 
All the figures were drawn with the aid of a camera lucida, and with the Leitz 
Obj. I inch, or inch, and ocular 4. 
Caeoma nitens 
Magnification 1570 diameters 
Fig. I. An aecidiospore which contains three nuclei. 
Fig. 2. An aecidiospore which contains four nuclei. 
Fig. 3. A normal aecidiospore containing two nuclei. 
Fig. 4. An aecidiospore which has become uninucleate. 
Fig. 5. A uninucleate aecidiospore in an early stage of germination. 
Fig. 6. A later stage of germination in which the nucleus is much elongated 
and is passing up the promycelial tube. 
Fig. 7. First nuclear division, diaster. 
Fig. 8. The second nuclear division in telophase. 
Fig. 9. A promycelial tube containing two nuclei that have rounded up after 
the first division. 
Fig. 10. An aecidiospore containing two nuclei and producing a promycelial 
tube. This figure suggests that the first division has taken place in the spore. 
