166 INDEX TO AMERICAN BOTANICAL LITERATURE 
Paulsen, O. Some remarks on the desert vegetation of America 
Plant World 18: 155-161. Je 1915. 
Payson, E. The pollination of Asclepias cryptoceras. Bot. Gaz. 61: 
72-74. 159 Ja 1916. 
Pearl, R., & Surface, F. M. Growth and variation in maize. Zeits. 
Induk. Abstammungs- und Vererbungslehre 14: 97-203. f. I-16, 
Jl rors. 
Pease, A. S.  Arenaria stricta in the White Mountains. Rhodora 17: 
232, 233. 6 Ja 1916. 
Peters, R. A preliminary study of the causes that produce “bald- 
headed” kelp. Kansas Univ. Sci. Bull. 9: 3-10. pi. r. D 1% 
Pickett, F. L., & Nothnagel, M. The mosses of Monroe County, 
Indiana,—III. Proc. Indiana Acad. Sci. 1914: 181-184. 1914. : 
Pipal, F. J. Oat smut in Indiana. Proc. Indiana Acad. Sci. 19i4: 
19t-196. 1914. 
Pitz, W. Effect of elemental sulphur and of calcium sulphate on certain 
of the higher and lower forms of plant life. Jour. Agr. Research 5: 
771-780. pl. 56. 17 Ja 1916. ae 
Ramsey, G.B. The genus Rosellina in Indiana. Proc. Indiana Acad. 
Sci. 1914: 251-265. pl. agi CIGTA: 
Read, A.D. The flora of the Williams division of the Tusayan national 
forest, Arizona. Plant World 18: 112-123. f. r, 2. Ap 1915. 
Rehder, A. The Bradley bibliography 1: i-xii + 1-566. 1911; 2: 
i-vi + 1-926. 1912. 
Volume 1, Dendrology, Part I; volume 2, Dendrology, Part II. 
Robbins, W. W., & Reinking, O. A. F ungous diseases of Colorado 
crop plants. Colorado Agr. Exp. Sta. Bull. 212: 1-54. pl. I-19: 
O 1915. 
Rose, J. N. Edward Lee Greene. Bot. Gaz. 61: 70-72. 15 Ja 1915- 
[Portrait.] 
Riibel, E. Die auf der “ International pflanzen-geographischen Exkur- 
sion” durch Nordamerika 1913 kennengelernten Pflanzengesell- 
schaften. Bot. Jahr. Beibl. 53: 3-36. pl. 1-6. 19 O 1915. 
Seaver, F. J. North American species of Ascodesmis. Mycologia e 
I-4. pl. 172. Ja 1916. 
Ascodesmis porcina Sp. nov. is described, 
Shafer, J. F. Rambles in Panama and Jamaica. Bot. Soc. W. Pent 
sylvania Publ. 1: 19-22. 27 N 1giI. 
