INDEX TO AMERICAN BOTANICAL LITERATURE 465 
Penland, C. W. Notes on North American Scutellarias. Rho- 
dora 26: 61-79. pl. 140-z41. “Ap” 2 Je 1924 
Including descriptions of new forms, varieties, and combinations. 
Pfeiffer, H. Conspectus Cyperacearum in America medionali 
nascentium III. Additamenta ad cognitionem generis 
Pleurostachys Brongh. II. Repert. Sp. Nov. Regn. Veg. 19: 
294-296. 20 F 1924. 
Including descriptions of 3 new species and I new combination. 
Pilger, R. Plantae Luetzelburgianae brazilienses III. Notizbl. 
Bot. Gart. Berlin 8: 712-716. 15 F 1924. 
Including descriptions of 10 new species. 
Pinckney, R. M. Effect of nitrate applications upon the hydro- 
cyanic-acid content of sorghum. Jour. Agr. Research 27: 
717-723; & Mr 1924. 
Piper, C. V. The genus Oxyrhynchus Brandegee. Jour. Wash- 
ington Acad. Sci. 14: 46-49. f. -10. 19 Ja 1924. 
Including descriptions of Oxyrhynchus alienus sp. nov. 
Plitt, C. C., & Pessin, L. J. A study on the effect of evaporation 
and light on the distribution of lichens. Bull. Torrey Club 
51: 203-210. ‘My’? 13 Je 1924. 
Reed, H. S., & Haas, A.R.C. Iron supply in a nutrient medium. 
Bot. Gaz. 77: 290-299. 19 My 1924. 
Reddick, D., & Stewart, V. B. Crown-gall of apple and peach 
with notes on the biology of Bacterium tumefaciens. N. 
Y. (Ithaca) Agr. Exp. Sta. Memoir 73: 1-19. pl. 1-2. f. I-2. 
Mr 1924. 
Riley, L. A. M. The Mexican and Central American species of 
Ouratea. Kew Bull. Misc. Inf. 1924: IOI-III. 1924. 
Including descriptions of 6 new species and 1 new combination. 
Roberts, J. W. Morphological characters of Alternaria mali 
Roberts. Jour. Agr. Research 27: 699-708. pl. 1-2. 1 Mr 
1924. 
Roquette-Pinto, E. Nota sobre a accao physiologica da Fava 
Tonka. Bol. Mus. Nac. Rio de Janeiro 1: 127-135. 1924. 
Rowlee, S. A collection of Costa Rican fungi. Mycologia 
16: 115-121. pl. 11-12. 31 My 1924. 
