INDEX TO AMERICAN BOTANICAL LITERATURE 47 
Kunkel, L. O. Further data on the orange-rusts of Rubus. Jour. 
Agr. Research 19: 501-512. pl. D + pl. 92-04. 16 Au 1920. 
Lakon, G. Abnormes Vorkommen von gefingerten Blattern bei Acer 
negundo L. Zeitschr. Pflanzenkr. 27: 100-102. f. 1-2. 25 Ap I9I7. 
Lamson-Scribner, F. Parks and gardens of Buenos Aires. Nat. Hist. 
20: 305-311. My-—Je 1920. 
Langdon, La D. M. Stem anatomy of Dioon spinulosum. Bot. Gaz. 
7O: 110-125. pl. 15-17 + f. I-g. 21 Ap 1920. 
Langdon, S. C., & Gailey, W. R. Carbon monoxide a respiration prod- 
uct of Nereocystis Luetkeana. Bot. Gaz. 70: 230-239. f. I-3. 15 
S 1920. 
La Rue, C. D. Isolating single spores. Bot. Gaz. 70: 319-320. 19 
O 1920. 
Legrand, J. F. El Paspalum dilatatum. I. Revista Agric. Puerto Rico 
5!: 13-17. Jl 1920; II. 5%: 8-13. Au 1920. [Illust.] 
Legrand, J. F. Plantas titiles de Puerto Rico. Revista Agric. Puerto 
Rico 4°: 5-10. 31 My 1920. 
Lehman, S. C. Penicillium spiculisporum, a new ascogenous fungus. 
Mycologia 12: 268-274. pl. 19. 1920. 
Levine, M. The behavior of crown gall on the rubber tree (Ficus 
elastica). Proc. Soc. Exper. Biol. and Med. 17: 157, 158. 1920. 
Lloyd, C. G. Mycological notes. 63: 945-984. My 1920. 
Loesener, T. Uber eine neue Stromanthe-Art. Notizbl. Bot. Gart. 
und Mus. Berlin-Dahlem 7: 410-411. 15 My 1920. 
Stromanthe humilis of tropical America. 
Lumbard, L. H. Cleavers. Am. Bot. 26:95. Au 1920. 
Mac Caughey, V. Hawaii's tapestry forests. Bot. Gaz. '70: 137-147. 
f. 1-6. 21 Au 1920. 
Mac Caughey, V. The Hawaiian olona. Science II 52: 240-241. 
10 S$ 1920. 
Mac Dougal, D.T. Auxographic measurement of swelling of bicolloids 
and of plants. Bot. Gaz. 70: 126-136. f. 1, 2. 21 Au 1920. 
MacDougal, D. T., & Spoehr, H. A. Swelling of agar in solutions of 
amino acids and related compounds. Bot. Gaz. 70: 268-278. f. 1-6. 
19 O 1920. 
Macmillan, H. G. A frost injury of potatoes. Phytopathology 10: 
423-424. pl. 13. 1920. 
Maddox, R.S. A veteran giant of elms. Am. For. 26: 611. O 1920. 
