326 INDEX TO AMERICAN BOTANICAL LITERATURE 
Payne, F. W. Liostephania and its allies. Pp. 1-30. pl. 1-4. 
London, England. 1922. 
Pennell, F. W. Through the Andes of western Colombia. 
Ann. Rep. Acad. Nat. Sci. Philadelphia 1922: 15-28. 1923. 
[Illust.] 
Petrak, F. Mykologische Notizen V. Ann. Mycol. 21: 1-69. 
1923. 
Petrak, F. Mykologische Notizen VI. Ann. Mycol. 21: 182- 
335- 1923. 
Includes Brencklea, gen. nov., from Dakota, and new species from Porto 
Rico in Peroneutypa (1), Calosphaeria (1), Physalospora (1), Psiloglonium (1), 
and Patellaria (1). 
Petrak, F.,& Sydow, H. Kritisch-systematische Originalunter- 
suchungen iiber Pyrenomyzeten, Sphaeropsideen und Me- 
lanconieen. Ann. Mycol. 21: 349-384. 1923. 
Includes Rhynchostomopsis, gen. nov., from Brazil. 
Pfeiffer, N. E. Isoetaceae. In Abrams, 1. R., An illustrated 
flora of the Pacific states 1: 35-38. 1923. [Illust.] 
Raeder, J. M. Study of the Phycomycetes of Iowa. Proc. 
Iowa Acad. Sci. 28: 283-293. 1921. 
Rawitscher, F. Epinastie und Geotropismus. Zeits. Bot. 15: 
65-100. pl. I. 1923. 
Reports experiments made with Tradescantia. 
Reddy, C. S., & Godkin, J. A bacterial disease of brome-grass. 
Phytopathology 13: 75-86. pl. 1,2. 27 F 1923. 
Reed, H. S. A note on the statistics of cyclic growth. Proc. 
Nat. Acad. Sci. 9: 65-67. f. 7. 15 Mr 1923. 
Reed, H.S., & Haas, A. R. C. Effect of sodium chloride and 
calcium chloride upon growth and composition of young 
orange trees. Univ. California Agr. Exper. Sta. Techn. 
Pap. 4: 1-22. pl. 1-6. Ap 1923. 
Riker, A. J. Some morphological responses of the host tissue 
to the crown-gall organism. Jour. Agr. Research 26: 425— 
436. pl. 1-6. 1 D 1923. 
