344 INDEX TO AMERICAN BOTANICAL LITERATURE 
Caverhill, P. C. Forestry problems in British Columbia. Jour. 
For. 20: 44-53. Ja 1922. 
Chardon, C. E. Contribution to our knowledge of the Pyre- 
nomycetes of Porto Rico. Mycologia 13: 279-300. pl. 13- 
15. + f. 1-4. 21 Ja 1922. 
Includes 9 spp. nov. and 1 comb. nov. 
Churchill, J. R. Cimicifuga racemosa in Massachusetts. 
Rhodora 23: 201-203. 9 Ja 1922. 
Clements, F. E. Aeration and air-content. The role of oxygen 
in root activity. Carnegie Inst. Washington Publ. 315: 
3-183; 1921: 
Clokey, I. W. Carex notes. Am. Jour. Sci. 3: 88-91. pl. 2. 
Ja 1922. 
Includes Carex apoda and C. Paysonis, spp. nov. 
Coates, L. The “peach-almond” hybrid. Jour. Hered. 12: 
328, 329. 20 F 1922. [Illust.] 
Cocks, R. S. A list of the trees of Louisiana. Jour. Arnold 
Arbor. 2: 204-216. Ja 1922. 
Cockerell, T. D. A. Flora of Porto Santo. Torreya 22: 4-10. 
fo2, 2 F 1922. 
Coker, W. C., & Grant, F. A. A new genus of water mold 
related to Blastocladia. Jour. Elisha Mitchell Sci. Soc. 
37: 180-182. pl. 32.. Mr 1922. 
Septocladia gen. nov. and S. dichotoma sp. nov. 
Collins, G. N. Teosinte in Mexico. Jour. Hered. 12: 339-350. 
24-9; 62s, 
Conti, M. El campo experimental de hidrologia agricola. 
Revista Facult. Agron. 14: 97-121. 1921. [Illust.] 
Cooper, W. S. The ecological life history of certain species of 
Ribes and its application to the control of the white pine 
blister rust. Ecology 3: 7-16. f. 1-3. 25 F 1921. 
Cundall, F., & Fawcett, W. Dr. Anthony Robinson of Jamaica. 
Jour. Bot. 60: 49-52. F 1922. 
Davis, B. M. Species, pure and impure. Science II. 55: 107- 
Tig. 3 P1622. ; 
