INDEX TO AMERICAN BOTANICAL LITERATURE 437 
Gates, F. C. Xerofotic movement in leaves. Bot. Gaz. 61: 399-407. 
f. 1-8. 15 My 1916. 
Gilkey, H. M. A revision of the Tuberales of California. Univ. Calif. 
Publ. Bot. 6: 275-356. pl. 26-30. 31 Mr 1916. 
Graff, P.W. Fungi. [In Merrill, E. D., An enumeration of the plants 
of Guam.] Philip. Jour. Sci. 9: (Bot.) 37-40. Ap 1916. 
Includes Cladosporium Clemensiae Graft. 
Harper, R. M. Geography and vegetation of northern Florida. Ann. 
Rep. Florida State Geol. Surv. 6: 167-451. f. 41-90. 1914. 
Harter, L. L. Rhizoctonia and Sclerotium rolfsit on sweet potatoes. 
Phytopathology 6: 305, 306. Je 1916. 
Hauman, L. Dioscoréacées de l’Argentine. An. Mus. Nac. Hist. 
Nat. Buenos Aires 27: 441-516. f. I-33. 1915. 
Includes seven new species and six new varieties. 
Hauman,L. Les Alismatacées Argentines. An. Mus. Nac. Hist. Nat. 
Buenos Aires 27: 307-324. pl. 8. 1915. 
Hauman, L. Note sur Hydromystria stonolifera Mey. An. Mus. 
Nac. Hist. Nat. Buenos Aires 27: 325-331. I915.- 
Hauman, L. Note sur les Joncacées des petits genres andins. An. 
Mus. Nac. Hist. Nat. Buenos Aires 27: 285-306. pl. 6,7 +f. 1-4. 
I9I5. 
Includes the new genus Andesia. 
Hawkins, L. A. The influence of calcium, magnesium and potassium 
nitrates upon the toxicity of certain heavy metals toward fungus 
spores. Physiol. Researches 1: 57-92. f. 1-6. Au 1913. 
Heatley, M. A study of the life history of Trillium cernuum L. Bot. 
Gaz. 61: 425-429. pl. 27. 15 My 1916. 
Hollick, A. A quaint old work on seaweeds. Proc. Staten Island 
Assoc. Arts & Sci. 5: 85-91. My 1915. 
Hollick, A. Some botanical and geological features of the Silver Lake 
basin. Proc. Staten Island Assoc. Arts & Sci. 5: 60-65. pl. 2-5. 
10 Ap 1916. ; 
Hotson, J. W. Observations on fire blight in the Yakima Valley, 
Washington. Phytopathology 6: 288-292. ol. F, 8. Je 1916. 
Humphreys, E. W. Sphenozamites Rogersianus Fontaine; an addition 
to the Rhaetic flora of San Juancito, Honduras. Jour. N. Y. Bot. 
Gard. 17: 56-58. Ap 1916. 
Jessen, K. The structure and biology of arctic flowering plants 
—II. 1. Rosaceae. Meddelelser om Grénland 37: 1-126. f. I-41. 
1913. 
Jones, F. R. Pleosphaerulina on alfalta. Phytopathology 6: 299, 
300.. Je 1916. 
