KUNKEL: ORANGE RUSTS OF RUBUS 569 
observation except in a few cases where germination tests or 
infection experiments were made. 
5. The short-cycled Caeoma nitens seems more widespread in 
the United States than Gymnoconia interstitialis. 
6. It seems to be the short-cycled form of the orange rust that 
is so destructive to our cultivated blackberries and raspberries 
in this country. 
I wish to thank Professor R. A. Harper for much helpful advice 
and criticism in connection with this work. 
COLUMBIA UNIVERSITY 
_ BIBLIOGRAPHY 
. Arthur, J.C. North American Flora 73: 161-268. 1912. 
2. Burrill, T. J. Parasitic fungi of Illinois, Part I. Bull. Illinois 
Lab. Nat. Hist. 2: 141-255. 1885. 
. Clinton, G. P. Orange rust of raspberry and blackberry. _ IIli- 
nois Agr. Exp. Sta. Bull. 29: 273-300. pl. 1-4. 1893. 
4. Clinton, G. P. Relationship of Cacoma nitens and Puccinia 
Peckiana. Bot. Gaz. 20: 116, 117. 1895. 
Fischer, E. Die Frage der Zusammengehérigkeit von Caecoma 
interstitiale Schlecht. und Gymnoconia Peckiana (Howe) Trotter. 
Mitteil. Naturf. Gesells. Bern 13. 1915. 
Kunkel, L. O. The production of a promycelium by the aecidio- 
spores of Caeoma nitens Burrill. Bull. Torrey Club 40: 361-366. 
Foe. POTS, 
Kunkel, L. O. Nuclear behavior in the promycelia of Caeoma 
nitens Burrill and Puccinia Peckiana Howe. Am. Jour. Bot. 1: 
37-47. pl. 3. 1914. 
. Lagerheim, N. G. Ueber Uredineen mit variablem Pleomorphis- 
mus. Tromsé Mus. Aarsch. 16: 105-152. 1894. 
9. Liro, J. I. Kulturversuche mit finnischen Rostpilzen. II. Acta 
Soc. F. et Fl. Fenn. 297: 1-58. 1907. 
10. Maire, R. L’évolution nucleaire chez les Endophyllum. Jour. de 
Bot. 14: 369-382. 1900. 
11. Newcombe, F. C., & Galloway, B. T. Perrennial mycelium of the 
fungus of the blackberry rust. Jour. Mycol. 6: 106-107. 1890. 
12. Olive, E. W. Sexual cell fusions and vegetative nuclear divisions 
in the rusts. Ann. Bot. 22: 331-360. pl. 22. 1908. 
13. Tranzschel, W. Culturversuche mit Cacoma sinterstisiale Schlecht. 
(= Caeoma nitens Schw.). Hedwigia 32: 257-259. 1893 
14. Werth, E. Zur Kenntniss des Sempervivum-Rostes. Centralb. 
Bakt. Zweite Abt. 39: 395-408. 1913. [Illust.] 
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