INDEX TO AMERICAN BOTANICAL LITERATURE 61 
Pieters, A. J. The ferax group of the genus Saprolegnia. Mycologia 
7: 307-314. pl. 170. N I915. 
Pilger, R. Plantae Uleanae novae vel minus cognitae. Notizbl. 
Konigl. Bot. Gart. Berlin 6: 311-396. 205 I9I5. 
Includes articles by Ule (V i Dichapetal 
taceae); Ulbrich (Malvaceae); Harms (Passifloraceae, Araliaceae); Fr. Kranzlin 
(Bignoniaceae); and Fritsch (Gesneriaceae). 
Platt, E. L. The population of the “ blanket-algae ” of freshwater 
pools. Am. Nat. 49: 752-762. D 1915. [Illust.] 
Ochnaceae, Melastoma- 
1 
2 
Pouysségur, H. B. Expedicién al Ibera. An, Soc. Cien. Argentina 
78: 241-258. D 1914: 79: 35-64. F 1915; 135-161. Ap 1915. 
Rand, F. V. Dissemination of bacterial wilt of cucurbits. Jour. Agr. 
Research 5: 257-260. pl. 24. 8 N 1915. : 
Preliminary note. 
Reed, E. L. Drosera annua sp. nov. Torreya 15: 246, 247. f. I. 
Ig N 1915. . 
Rees, C. C., & Macfarlane, W. A bibliography of recent literature 
concerning plant-disease prevention. Illinois Agr. Exp. Sta. Circ. 
183: 2-78. My 1915. 
Roberts, E. A. The distribution of beach plants. Bot. Gaz. 60: 
406-411. 15 N 1915. 
Rolfe, R. A. Promenaea micropiera. Curt. Bot. Mag. IV. 11: pl. 
8631. O 1915. 
A plant from tropical South America. 
Rolfe, R. A. Sievekingia shepheardit. Curt. Bot. Mag. IV. 11: pl. 
8635. N 1915. 
A plant from Colombia. ee 
Rosenbaum, J. Pathogenicity and identity of Sclerotinia libertiana 
and Sclerotinia smilacina on ginseng. Jour. Agr. Research 5: 
291-298. pl. 28, 2o+f. 1. 15 N 1915; 
Rothe, W. Uber die Gattung Marsdenia R. Br. und die Sta 
der Condurangorinde. Bot. Jahrb. 52: 354-434- f. 1-15. 3 Au 
IQI5. 
Includes 8 new species from America. 
Sifton, H. B. On the occurrence and significance 0! 
of Sanio in the cycads. Bot. Gaz. 60: 400-405. pl. 15-15 N 1915. 
Smith, E. H. Pythiacystis infection of deciduous nursery stock. 
Phytopathology 5: 317-322. f. 1-4: N 1915. ; 
Smith, R. E., & Boncquet, P. A. Connection of a bartestal ene 
with curly leaf of the sugar beet. Phytopathology 5: 335 342. 
pl. 17+f. 1. N 1915- 
mmpflanze 
“ bars "’ or “ rims’ 
