232 INDEX TO AMERICAN BOTANCIAL LITERATURE 
Pennell, F. W. Concerning duplicate types. Torreya 19:13, 14. 21 
F 1919. 
Pennell, F. W. Some remarks upon Limosella. Torreya 19: 30-32 
F 1919. 
Piper, C. V., & Coe, H.S. Rhizoctonia in lawns and pastures. Phyto- 
pathology 9: 89-92. pl. 7, 8. 26 F 19109. 
Pope, W. T. The banyan and some other closely allied species. Ha- 
waiian Forest. & Agr. 6: 121-129. Mr 1909.  [Illust.] 
Ramaley, F. Xerophytic grasslands at different altitudes in Colorado. 
Bull. Torrey Club 46: 37-52. f. 1, 2. 25 F 1919. 
Reddick, D. Vern Bonham Stewart. Phytopathology 9: 111-113. 
8 Mr 1919. [Portrait.] 
Reddick, D., & Stewart, V. B. Additional varieties of beans suscep- 
tible to mosaic. Phytopathology 9: 149-152. 8 Mr 19109. 
Reed, H. S., & Halma, F. F. On the existence of a growth-inhibiting 
substance in the Chinese lemon. Univ. Calif. Publ. Agr. Sci. 4: 
99-112. pl. 3-6. 15 F 1919. 
Reinking, O. Philippine plant diseases. Phytopathology 9: 114-140. 
8 Mr 1919. 
Rhoads, A. S. The biology of Polyporus pargamenus Fries. N. Y. 
State Col. Tech. Publ. 18: 1-197. pl. 17-31. Je 1918. 
Rock, J. F. Cyrtandreae Hawaiienses, sections Schizocalyces Hil- 
- lebr. and Chaetocalyces Hillebr. Am. Jour. Bot. 6: 47-68. pl. 3- 
Mr 1919. 
Includes Cyrtandra Conradtii, C. kohalae, C. halawensis and C. umbracculifiora, 
spp. nov. 
Rose, D.H. Blister canker of apple trees; a physiological and chemical 
study. Bot. Gaz. 67: 105-146. f. I-10. 15 F 1919. 
Sanders, J. G. The European potato ward disease discovered in 
Pennsylvania. Month. Bull. State Com. Hort. Calif. 8: 10-12. 
f. 6-8. Ja 1916. . 
Schacke, M. A. A chromosome difference between the sexes of 
Sphaerocarpos texanus. Science Il. 49: 218, 219. 28 F 1919. 
Schlechter, R. Kritische Aufzahlung der bisher aus Zentral-Amerika 
bekanntgewordenen Orchidaceen. Beih. Bot. Centralb. 36: 321-520. 
1918. 
Includes the new genus Epilyna and 84 new species in various genera. 
Shamel, A. D. Bud variation in dahlias. Jour. Heredity 9: 362-364. 
J. 2i, 12... 6 F 166. 
