INDEX TO AMERICAN BOTANICAL LITERATURE 69 
Fernald, M. L. The American representatives of Avrenaria 
sajanensis. Rhodora 21: 12-17. Io F Igig. 
Includes Arenaria marcescens, sp. nov., from Newfoundland and Quebec. 
Fernald, M. L. American variations of Avrenaria  verna. 
Rhodora 21: 21, 22. 10 F 191g. 
Fernald, M. L. The earlier names for Alsinopsis. Rhodora 
21: 9-12. 10 F 1919. 
Fernald, M. L. The specific identity of Arenaria groenlandica 
and A. glabra. Rhodora 21: 17-21. 10 F 1919. 
Fernald, ae L. The type of the genus Alsine. Rhodora 21: 
7-9. 10 F 1919. 
oo i L. The unity of the genus Arenaria. Rhodora 
1: 1-7. 10 F 1919. 
ae many new combinations. 
Goodspeed, T. H., McGee, J. M., & Hodgson, R. W. Note on 
the effects of illuminating gas and its constituents in causing 
abscission of flowers in Nicotiana and Citrus. Univ. 
California Publ. Bot. 5: 439-450. 28 D 1918. [Corrected 
reprint.] 
Griffiths, D., & Juenemann, H. E. Commercial Dutch-bulb 
culture in the United States. U.S. Dept. Agr. Bull. 797: 
I-50. f; 2-32: 22: N--ig1.- 
Harper, R. M. The supposed southern limit of the eastern 
hemlock. Torreya 19: 198, 199. O IgI9. 
Harper, R. M. Water and mineral content of an epiphytic 
fern. Am. Fern Jour. 9: 99-103. 24 Ja 1920. 
Polypodium polypodioides (L.) Hitchcock. 
Herre, A. W. C. T. Supplement to the lichen flora of the 
Santa Cruz Peninsula, California. Jour. Washington Acad. 
Sci. 2: 380-386. 19 S 1912. 
Includes Thelocarpon albomarginatum, sp. nov. 
Hitchcock, A. S. History of the Mexican grass, Ixophorus 
unisetus. Jour. Washington Acad. Sci. 9: 546-551. 4 N 
1919. 
Hodges, R. S. Ringworm of the nails. Arch. Dermat. & 
Syphil. 4: 1-26: f. 1-12. “Jl 1921. 
Caused by species of Trichophyton. 
Hollick, A. Quercus heterophylla in the Clove Valley [New 
York]. Proc. Staten Id. Assoc. Arts & Sci. 7: 32-34. pl. 
4.  Ag18. 
