INDEX TO AMERICAN BOTANICAL LITERATURE 371 
Spoehr, H. A., & McGee, J. M. Studies in plant respiration 
and photosynthesis. Carnegie Instit. Washington Publ. 
325: i-iv + 1-08. f. 1-27. F 1923. 
Sprague, T. A. Notes on Theaceae. Jour. Bot. 61: 17-19. 
Ja 1923. 
Sprague, T. A. Types of Linnean species. Jour Bot. 61: 
26, 27... ja .1923- 
Stakman, L. J. Some fungi causing root and foot rots of cereals. 
Univ. Minnesota Stud. Biol. Sci.4: 139-162. pl. 26-28 +f. 1. 
Ja 1923. 
Stapf, O. Echinocactus undulatus. Bot. Mag. 148: pl. 8951. 
20 F 1923. 
[Stapf, O.] Mavillaria Fletcheriana. Bot. Mag. 148: pl. 8949. 
20 F 1923. 
Stomps, T. J. Uber die Umwandlung des Blattes zum Stengel. 
Ber. Deuts. Bot. Ges. 41: 4-11. 22 F 1923. 
Suessenguth, K. Uber die Pseudogamie bei Zygopetalum Mack- 
ayi Hook. Ber. Deuts. Bot. Ges. 41: 16-23. f. I. 22 F 
1923. 
Swingle, W. T., & Robinson, T. R. Two important new types 
of citrous hybrids for the home garden—citrangequats and 
limequats. Jour. Agr. Research 23: 229-239. pl. I-4. 27 
Ja 1923. 
Tabor, R. J., & Bunting, R.H. Ona disease of cocoa and coffee 
fruits caused by a fungus hitherto undescribed. Ann. Bot. 
37: 153-157. f. 1-3. Ja 1923. 
Trachysphaera, gen. nov. 
Tanaka, T. Citrus fruits of Japan. Jour. Hered. 13: 243-253- . 
1-4, a FS P1925. 
Thayer, P. A variation in the Downing gooseberry. Jour. 
Hered. 13: 284. 15 F 1923. 
Thomas, W. Ultimate analysis of the mineral constituents of 
a Hagerstown silty clay loam soil and occurrence in plants 
of some of the elements found. Soil Sci. 15: 1-18. Ja 1923- 
