350 INDEX TO AMERICAN BOTANICAL LITERATURE 
Lee, H. N., & Hovey, R. W. The principal properties, structure and 
identification of Canadian pulpwoods. Pulp & Paper Mag. 16: 
419-422. f. I-6. 9 My 1918. 
Lehman, 8. G. Conidial formation in Sphaeronema fimbriatum. My- 
cologia 10: 155-163. pl. 7. My 1918. 
Levy, D. J. Astation for Ephemerum near New York City. Bryolo- 
gist 21: 33. 30 Ap 1918. 
Lipman, C. B., & Gericke, W. F. Copper and zinc as antagonistic 
agents to the ‘alkali’ salts in soils. “Am. Jour. Bot. 5: 151-170, 
f. 1, 2. 16 My 1918. 
Léfgren, A. Novas contribuicoes para as Cactaceas brasileiras sobre 
os generos Zygocactus a Schlumbergera. Arch. Jard. Bot. Rio de 
Janeiro 2: 19-32. pl. 3-6. 1918. 
Zygocactus candidus sp. nov. is described. 
Lofgren, A. Novas contribuigoes para o genero Rhipsalis. Arch. 
Jard. Bot. Rio de Janeiro 2: 35-45. pl. 7-17. 1918. 
Six new species are described. 
Lofgren, A. Novas subsidios para a flora Orchidacea do Brasil. Arch. 
Jard. Bot. Rio de Janeiro 2: 49-62. pl. 18-26. 1918. 
Includes new species in Pleurothallus (8), Epidendrum (1), Leptotes (1), and 
Moaxillaria (1). 
Long, W. H. An undescribed canker of poplars and willows caused by 
Cytospora chrysosperma. Jour. Agr. Research 13: 331-345. pl. 
27, 28. 6 My 1918. 
Long, W. H., & Harsch, R. M. Aecial stage of Puccinia oxalidis. 
Bot. Gaz. 65: 475-478. 15 My 1918 
Ludwig, C. A. The effect of tobacco smoke and of methyl] iodide vapor 
on the growth of certain microérganisms. Am. Jour. Bot. §i-171~ 
177- 16 My 1918. 
Maxon, W. R. A new hybrid Asplenium. Am. Fern. Jour. 8: 1-3 
Mr 1918 
Asplenium Gravesii hybr. nov. 
McAtee, W. L. Note on the plants of Wallop’s Island, Virginia. 
Torreya 18: 70, 71. 8 My 1918. 
McColl, W. R. The male fern at Owen Sound, Ontario. Am. Fern 
Jour. 8: 18,19. Mrig18. 
Millspaugh, C. F., & Sherff, E.E. New species of Xanthium and Soli- 
dago. Field Mus. Nat. Hist. Publ. 199: 1-7. pl. 1-6. 22 Ap 1918. 
Six new species are described. 
Mosher, E. , The grasses of Illinois. Illinois Agr. Exp. Sta. Bull. 205; 
261-425. f. I-287. Mr 1918. 
