320 INDEX TO AMERICAN BOTANICAL LITERATURE 
Bessey, C. E. The forest trees of eastern Nebraska. Proc. Iowa 
Acad. Sci. 13: 75-87. maps. [Mr] 1907. 
Bessey, E. A. Spore forms of Spegazzinia ornata Sacc. Jour. Myc. 
13: 43-45. pl. ror. 30 Ap 1907. 
Blakeslee, A. F. The nature and significance of sexual differentiation 
in plants. Science II. 25: 366-372. 8 Mr 1907. 
Blanchard, W. H. Our eastern shadwoods. Torreya 7: 97-102. 
20 M 
Includes descriptions of 2 new species in Amelanchier. 
Britten, J. Notes on Halorrhagaceae. Jour. Bot. 45: 135-1 38... 4 
Ap 1907. 
A few South American references. 
Britton, E. G. & Hollick, A. American fossil mosses, with description 
of a new species from Florissant, Colorado. Bull. Torrey Club 34: 
139-142. pl.g. 7 My 1907. 
Glyphomitrium Cockerellae sp, nov. 
Britton, N. L. Report on the continuation of the botanical explora- 
tion of the Bahama Islands. Jour. N. Y. Bot. Gard. 8: 71-81. AP 
1907. 
Britton, N. L. Rides chihuahuense sp. nov. Torreya 7: 102. 20 
My 1907. 
Native of Mexico. : 
Brown, S. Botanizing in the Canadian Rockies. Proc. Acad. Nat. 
Sci. Phila. 58: 429, 430. 7 Ja 1907. 
Bush, B. F. Pogonatum tenue. Bryologist 10: 53. 2 My 1907: 
Caldwell, 0. W. & Baker, C.F. The identity of A@icrocycas calocoma. 
Bot. Gaz. 43 : 330-335- f- 1-3. 16 My 1907. 
Camsell, C. List of plants collected on the Peel River in 1906 by 
Mr. Charles Camsell. Ottawa Nat. 21:38. 7 My 1907. 
Christ, H. Filices columbianae leg. C. Wercklé. Bull. Herb. Boiss. 
Il. 7: 274. .31-Mr. 1907. 
Gymnogramme ( Eugymnogramme) woodsioides sp. nov. 
Christ, H. Filices mexicanae. Bull. Herb. Boiss. II. 7: 413-419 
2 07. 
Includes new species in Cyathea, Leptochilus, Dryopteris, Elaphoglossum, and Poly- 
podium. 
Christ, H. Primitiae florae costaricensis. Filices V. Bull. Herb. 
Boiss. sp 257-274. 31 Mr 
Describes new species in Pol; (5) 
lypodium ( " pee opteris , Preris, Diplazium (5) 
Cyathea (3), wer Elaphoglossum (2), en (3) 
