INDEX TO AMERICAN BOTANICAL LITERATURE 255 
Buscalioni, L. II legno crittogamico del fascio vascolare seminale 
di talune angiosperme considerato nei suoi rapporti colle 
moderne teorie filogenetiche. Malpighia 29: 46-80; 113-207. 
f. 1-30: 3 
Butters, F. K. A new western species of Pellaea. Am. Fern 
Jour. 11: 39, 40. 1921. 
Pellaea Suksdorfiana from Washington. 
Butters, F. K. Salvinia in Minnesota. Am. Fern Jour. 11: 
45-50. i921. 
Chapman, G. H. Tobacco investigations. Massachusetts Agr. 
Coll. Bull. 195: 1-38. pl.z-zB. [1920] 
Chiovenda, E. La culla del cocco. Webbia 5: 199-294. 1921. 
Concerning the origin of the coco-palm. 
Christensen, C. An overlooked species of Dryopteris Am. 
Fern Jour. 11: 44-46. 
Dryopteris crypia (Underw. & Maxon) from Cuba. 
Conzatti, C. Monografia del Arbol de Santa Maria del Tule. 
Pp. 1-65. Oaxaca, Mexico. Mr 1921. [Illust.] 
Account of a giant tree of Taxodium mucronatum Ten, 
Coons, G. H., & Levin, E. The relation of light to pycnidium 
formation in the Sphaeropsidales. Michigan Acad. Sci. 
Rep. 22: 209-213. Au 1921. 
Corrington, L. J. The Peltigeraceae. [The Ascomycetes of 
Ohio V]. Ohio Biol. Surv. 2: 354-362. pl. 14, 15. 28 My 
1921, 
Coville, F. V. The influence of cold in stimulating the growth 
of plants. Ann. Rep. Smithsonian Inst. 1919: 281-291. 
pl. I-27. 1921. 
Dahlgreen, U. Phosphorescent animals and plants. Nat. Hist. 
22: 1-26. Ap 1922. 
Dallimore, W. The yellow pines of North America. Kew Bull. 
Misc. Inform. 1921: 330-335. 1921. 
Dalton, L. V. The plants and animals of Venezuela. In Dalton 
L. V., Venezuela, 47-60. London. Ig912. [Illust.] 
