I22 INDEX TO AMERICAN BOTANICAL LITERATURE 
Welton, F. A. Longevity of seeds. Monthly Bull. Ohio Agr. 
Exp. Sta. 6: 18-24. 1921. [Illust.] 
[Corrected reprint. | 
Wercklé, C. Die natiirlichen Wachstumsbedingungen der 
epiphytischen Orchideen in Costa Rica. Gartenflora 70: 
90-94. 15 My 1921. 
Wester, J.P. The mango. Philipp. Bur. Agr. Bull. 18: 1-70. 
pl. I-17. 
Second revised edition. 
Wherry, E. T. The reactions of the soils supporting the growth 
of certain native orchids. Jour. Washington Acad. Sci. 
8: 591-598. 4 N 1918. 
Wherry, E. T. Soil reactions of Spiranthes cernua and its 
relatives. Rhodora 23: 127-129. 26 An 1921. 
White, D. Value of floral evidence in marine strata as indi- 
cative of nearness of shores. Bull. Geol. Soc. Amer. 22: 
221~227. 10 My I09gII. 
Williams, R.S. Hyophila subcucullata sp. nov. Bryologist 24: 
22. pl. 2. 25 [) 1921, 
From Cuba. 
Williams, R. S. Sematophyllum Smallii sp. nov. Bryologist 
23: 76-78. pl. 6. 2 D 1920. 
From Florida, 
Wilson, W. J. Palaeobotany. Summ. Rep. Canada Geol. 
Surv. Dept. Mines 1916: 300-302. 1917. , 
Wright, C. H. Aechmea chromatica, C. H. Wright [Bromeli- 
aceae-Bromelieae]. Kew Bull. Misc. Inform. 1921: 220, 
291. 21. 
New species from tropical! America. 
Yamanouchi, S. Life history of Corallina officinalis vat. 
mediterranea, Bot. Gaz. 72: 90-96. 15 Au 1921. 
