420 INDEX TO AMERICAN BOTANICAL LITERATURE 
Lillo, M. Segunda contribucion al conocimiento de los arboles de la 
Argentina. 1-69. Tucuman. 1917. 
Long, B. Jasione montana a conspicuous weed near Lakewood, New 
Jersey. Rhodora 21: 105-108. Je 1919. 
Lutman, B. F. Osmotic pressures in the potato plant at various stages 
of growth. Am. Jour. Bot. 6: 181-202. f. 1, 2. My 1919. 
MacDougal, D. T. Growth in organisms. Science II. 49: 599-605: 
27 Je 1919. 
Mackenzie, K. K. LEupatorium maculatum. Addisonia 4: 23, 24. 
pl. 132. 30 Je 1919. 
Mann, P. B. The relation of first year botany to advanced work, 
with reference to certain applications and by-products. Torreya 
19: 72-78. 25 Je 1919. 
Maxon, W. R. Ferns of the District of Columbia. Am. Fern Jour. 
9: 38-48. Jl 1919. 
Maxon, W. R. A new Alsophila from Guatemala and Vera Cruz. 
Proc. Biol. Soc. Washington 32: 125-129. 27 Je 1919. 
Alsophila scabriuscula sp. nov. 
Macinnes, F. J. The occurrence of Alternaria in a characteristic 
apple spot, and an apple rot caused by Gliocladium viride. Trans. 
Illinois Acad. Sci. 10: 218-229. pl. 1-4. 1917. 
McAtee, W.L. Summary of notes on winter blooming at Washington, 
D.C. Proc. Biol. Soc. Washington 32: 129-132. 27 Je 1919. 
McLean, R. C. Studies in the ecology of tropical rain-forests: with 
' special reference to the forests of south Brazil. Jour. Ecol. 7: 
5-54. pl. 1 +f. 1-27. My 19109. 
Melhus, I. E., & Rhodes, L.L.. A quick method of eliminating seed- 
borne organisms of grain. Science II. go: 21. 4 Jl 1919. 
Miles, L. E. Some new Porto Rican fungi. Trans. Illinois. Acad. 
Sci. 10: 249-255. f. I-3. 1917. 
Includes new species in Mycosphaerella (9), Helminthosporium (1), Cercospora (1). 
Nash, G. V. Crataegus macrosperma. Addisonia hc 38. Pl 138, 
30 Je 1919. 
Nash, G. V. The digger pine in the botanical garden. Jour. N. Y. 
Bot. Gard. 20: 127, 128. Je 1919. 
Nash, G.V. Malus Halliana. Addisonia 4: 27. pl. 134. 30 Je 1919. 
Nash, G. V. Oxydendrum arboreum. Dh stinaecnas 4: 37; 38. pl. 139- 
30 Je 1919. 
