270 InDEX TO RECENT LITERATURE 
Suringar,J.V. A€elocactus humilis Sur. (Niedriger Melonenkaktus. ) 
Gartenflora, 52: 59-63. 7. 8. 1 F 1903. : 
Thaxter, R. New or Peculiar North American Hyphomycetes. III. 
Bot. Gaz. 35: 153-159. pl. g, 5- 20 Mr 1903. 
Includes descriptions of two new genera, Heterocephalum, with one species, and 
Cephatiophora, with two. 
Tower, W. L. Variation in the Ray-flowers of Chrysanthemum Leucan- 
themum LL. at Yellow Springs, Greene Co., O., with Remarks upon 
the Determination of Modes. Biometrika, 1: 309-315. Ap 1902, 
Wagner, R. Beitrige zur Kenntnis einiger Kompositen. Verh. Zool. - 
bot. Gesells. Wien, 53: 21-65. f 7-6. 25 F 1903. 
Based chiefly upon North American material. 
White, C. A. Spontaneous Fission of Olive Trees in Palestine, 
Plant World, 6: 57, 58. A/. zo. Mr 1903. 
Williams, R.S. Pstlopilum Tschuctschicum C. Miill, Bryologist, 6: 
38. Mr 1903. 
