576 INDEX TO AMERICAN BOTANICAL LITERATURE 
Tansley, A. G. International Phytogeographical Excursion (I.P.E.) in 
America 1913. New Phytologist 12: 322-336. D 1913; 13: 30- 
Ai: (25 F 1914583: 83-92. 31 Mr 1914. 
Thom,C. Conidium productionin Penicillium. Mycologia 6: 211-215. 
Fide oka PP IOLA. 
Turesson, G. Slope exposure as a factor in the distribution of Pseu- 
dotsuga taxifolia in arid parts of Washington. Bull. Torrey Club 
41: 337-345. 22 JI 1914. 
Vaughan, R.E. A method for the differential staining of fungous and 
host cells. Ann. Missouri Bot. Gard. 1: 241, 242. My 1914. 
Vaupel, F. Borraginaceae. In Pilger, R. Plantae Uleanae novae vel 
minus cognitae. Notizbl. Kénigl. Bot. Gart. Berlin 6: 181-187. 
15 My 1914. 
Includes eight new species in Tournefortia. 
Vestal, A. G. A black-soil prairie station in northeastern Illinois. 
Bull. Torrey Club 41: 351-363. f. 1-7. 28 Jl 1914. 
Vries, H. de. L’Oenothera grandiflora de ’herbier de Lamarck. Rev. 
Gen. Bot. 25?: 151-166. f. 1. 1914. 
Vries, H. de. The principles of the theory of mutation. Science II. 
40: 77-84. 17 Jl 1914. 
Wagner, H. Echinocereus Weinbergii Weing. Monats. Kakteenk. 24: 
104. 15 Jl 1914. [Illust 
Walcott, C. D. Cambrian geology and paleontology. III. No. 2. 
Pre-Cambrian Algonkian algal flora. Smithsonian Mis. Coll. 64: 
77-156. pl. 4-23. 22 Jl. 1914. 
Wieland, G. R. A study of some American fossil cycads, Part VII. 
Further notes on disk structure. Am. Jour. Sci. 38: 117-136. 
jf. 1-9... Aw 1914. 
Williams, C. G. Variation in pure lines of wheat. Ann. Rep. Am. 
Breeders Assoc. 8: 409-412. 1912. 
Williams, R. S. Bolivian mosses—II. Bull. N. Y. Bot. Gard. 6: 
227-261. 1909 
Includes seventeen new species. 
Wilson, G. W. The identity of the anthracnose of grasses in the 
United States. Phytopathology 4: 106-112. 23 Ap 1914. 
Wilson, G. W. Studies in North American Peronosporales—VI. 
Notes on miscellaneous species. Mycologia 6: 192-210. pl. 135, 139: 
14 Jl 1914. 
Includes ne gen. nov. and Peronospora Lepidii, P. Chamaesycis, and P. 
minima, spp. ni 
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