INDEX TO AMERICAN BOTANICAL LITERATURE 163 
Schaffner, J. H. The time of sex determination in plants. Ohio 
Jour. Sci. 23: 225-240. O 1923. 
Seaver, F. J. Studies in tropical Ascomycetes—II. An inter- 
esting Xylaria from Porto Rico. Bull. Torrey Club 50: 
307-310. pl. 18. 23 O 1923. 
Xylaria Bruneriana, sp. nov. 
Seifriz,W. The altitudinal distribution of plants on Mt. Gedeh. 
Java. Bull. Torrey Club 50: 283-306. pi. 15-17 + f. 1-6. 
23 © 1623. 
Seward, A. C. A supposed Paleozoic Angiosperm. Bot. Gaz. 
76: 215. 15 © ios. 
Seward, A. C. & Walton, J. Ona collection of fossil plants from 
the Falkland Islands. Quart. Jour. Geol. Soc. 79: 313-333. 
pl. 19-22 + f. 1-5. S 1923. 
Includes Dadoxylon Bakeri, sp. nov., from the Permo-Carboniferous, 
Sherff, E. E. Studies in the genus Bidens VI. Bot. Gaz. 76: 
144-166. pl. 12-14. 15 O 1923. 
Includes two new species from Bolivia. 
Sherff, E. E. New or otherwise noteworthy Compositae. Bot. 
Gaz. 76: 78-94. pl. 6-9. 155 1923. 
Includes Coreopsis microcephalus, sp. nov., from Mexico. 
Small, J.K. Green deserts and dead gardens. Jour. New York 
Bot. Gard. 24: 193-247. O1923. [Illust.] 
‘A record of exploration in Florida in the spring of 1921.” 
Smith, C. M. Excretions from leaves as a factor in arsenical 
injury to plants. Jour. Agr. Research 21: 191-194. 27 O 
1923. 
Snell, W. H. The effect of heat upon the mycelium of certain 
structural-timber-destroying fungi within wood. Am. Jour. 
Bot. 10: 399-411. f.Z. 23 0 1923. 
Sprague, T. A. Heliocarpus americanus. Jour. Bot. 61: 255- 
acy... © 1093, 
Sprague, T. A. Pehria, nom. nov. Jour. Bot. 61: 238, 239. 5 
1923. 
