280 INDEX TO AMERICAN BOTANICAL LITERATURE 
Phillips, H.B. Some foreign trees used for ornamental planting 
~ in Pennsylvania. Forest leaves 29: 104-105. pl. 19. F 1924™ 
Piper, C. V. Bulbous bluegrass (Poa bulbosa de): Torreya 24: 
7-8. Ja-F 1924. 
Plitt, C. C. An ecological study of lichens. Ecology 5: 95-98. 
Ja 1924. 
Prescott, A. Gasterias. Am. Bot. 30: 24-25. Ja 1924. 
Rand, F. V., & Cash, L. C. Further evidence of insect dis- 
semination of bacterial wilt of corn. Science II. 59: 67-69. 
18 Ja 1924. 
Reed, H. S., & Haas, A. R. C. Some effects of certain calcium 
salts upon the growth and absorption of citrus seedlings. 
Am. Jour. Bot. 11: 15-18. “Ja” 7 F 1924. 
Rehder, A. New species, varieties and combinations from the 
herbarium and the collections of the pare Sanger 
Jour. Arnold Arboretum 5: 49-59. “Ja’’ 18 F 1924. 
Including the genera Xolisma, Andromeda, Erica, Aeron and Vibur- 
num, 
Rigg, G. B. The pharmacists’ botany I-XVII 1-303. New 
York. 1924. 
Robbins, W. J. Isoelectric points for mycelium of fhok Jour. 
General Physiology 6: 259-271. f. I-2. 20 Ja 1924. 
Rydberg, P. A. Notes on Fabaceae—III. Bull. Torrey Club 
Sit 13-23. “Ja” 8 'F- 1024; 
Including descriptions of new species in Homalobus (3), Kentrophyta (2) 
g new combinations. 
Sargent, C. S. Notes on North American trees—XII. Jour. 
Arnold Arboretum 5: 41-49. “Ja” 18 F 1 
192 
Including new varieties, hybrids and combinations in the genus Areculus. 
Saunders, C. F. Amphichromy again. Am. Bot. 30: 34-35. 
Ja 1924 
Scott, I. T. The influence of hydrogen-ion concentration on the 
growth of Fusarium Lycopersici and on tomato wilt. Mis- 
souri Agri. Exp. Sta. Research Bull. 64: 1-32. f. 1-10. Ja 
1924. 
