310 INDEX TO AMERICAN BOTANICAL LITERATURE 
Chardon Palacios, C. E. Un nuevo “‘smut’’ de Puerto Rico. Revista 
Agric. Puerto Rico 64: 21-23. 30 Ap 1921. [Illust.] 
Thecaphora pustulata Clinton, sp. nov. 
Cobb, F. A case of Mendelian inheritance complicated by heteroga- 
metism and mutation in Oenothera pratincola. Genetics 6: I-42. 
Ja 1921. 
Collins, F. S. Les algues marines de l’tle de Vancouver. Canad. 
Geol. Surv., Bull. Mus. Commem. Victoria 1: 117-158. 1913. 
A French transcript of a paper published in Bull. Victoria Mem. Mus. 1: 99-137. 
23 O 1913. 
Collins, G. N., & Kempton, J. H. Heritable characters of maize. I. 
Lineate leaves. Jour. Heredity 11: 3-6. 10 F 1920.  [Illust.] 
Deam, C. C. Trees of Indiana (First revised edition). Publ. Dept. 
Conserv. Indiana 13: 1-317. pl. 1-137. Ap 1921. 
Dickson, J. G. The relation of certain nutritive elements to the com- 
position of the oat plant. Am. Jour. Bot.8: 256-272. f. 1, 2. 24 My 
1921. 
Dode, L. A. Notes dendrologiques. Bull. Soc. Dendr. France 38: 
19-35. 15 F 1921. 
Notes on various species of Populus, including P. manitobensis sp. nov. from 
Canada. : 
Douglass, A. E. Climatic cycles and tree growth. A study of the 
annual rings of trees in relation to climate and solar activity. 
Carnegie Instit. Washington Publ. 289: 1-127. pl. 1-2 + f. I-40. 
1919. 
Douglass, A. E. A method of estimating rainfall by the growth of 
trees. In Huntington, E., The climatic factor as illustrated in 
arid America. Carnegie Instit. les dea Publ. 192: 101-121. 
pl. 4+ f. 9-25. 15 My 1914. 
Dunn, G. A. A comparative study of the two races of Rhizopus 
nigricans. Physiol. Researches 2: 301-339. f. z- Ap 1921. 
, G. A. Note on the histology of grain roots. Am. Jour. Bot. 
8: 207-211. f. 1-4. 30 Ap 1921. 
Duursma, G. D. Cereus flagelliformis. Succulenta 3: 15, 16. 9 Mr 
1921. 
Earle, F. S. The year’s experience with sugar-cane mosaic or yellow 
stripe disease. Jour. Dept. Agr. Porto Rico 3‘: 3-33. O 1919- 
Eaton, E.C. A large apple tree. Tree Talk 4:25. 1916. 
Eddelbiittel, H. Fossile Pflanzen als Klimazeugen. Verh. Naturw. 
Vereins Hamburg III. 22: LI-LIII. 1915 
