48 INDEX TO AMERICAN BOTANICAL LITERATURE 
Magness, J. R. Composition of gases in intercellular spaces of apples 
and potatoes. Bot. Gaz. 70: 308-316. f. 1. 19 O 1920. 
Matz, J. Gumming disease of sugar cane in Porto Rico. Phyto- 
pathology 10: 429-430. f. 1. 1920. 
Matz, J. La gomosis de la cafia. Revista Agric. Puerto Rico 5}: 
24-26. Jl 1920. [Illust.] 
Matz, J. La gomosis de la cafia de azticar. Puerto Rico Dept. Agric. 
y Trab. Circ. 20: 1-7. 1920. [1 plate.] 
Matz, J. Pudricién de la base de la “‘roselle.’’ Revista Agric. Puerto 
Rico 5!: 18-20. Jl 1920.  [Illust.] 
Maxon, W. R. Gleicheniaceae and Cyatheaceae, in Standley, P. C., 
Trees and shrubs of Mexico. Contrib. U. S. Nat. Herb. 23: 36-47. 
1920. 
McCool, M. M., & Millar, C. E. Use of dilatometer in studying soil and 
plant relationships. Bot. Gaz. 70: 317-319. 19 O 1920. 
McMurray, N. Color of Aster florets. Am. Bot. 26: 107. Au 1920. 
Mc Rae, W. A. Some principal fibre-bearing plants of Florida. 
Florida Agr. Dept. Bull. 30: 7-15. 1 Jl 1920. 
Mez, C. Novae species Panicearum. Notizbl. Bot. Gart. und Mus. 
Berlin Dahlem 7: 45-78. 15 My 
New American species in Olyra (5), ee bs: Pennisetum (1), Setariopsis (1) 
and Panicum (15). 
Moreau, F. A propos du nouveau genre Kunkelia Arthur. Bull. Soc. 
Mycol. France 36: 101-103. 15 Jl 1920. 
Morita, K., & Livingstone, B. E. Some solution cultures of wheat 
without potassium. Tokio Bot. Mag. 34: 71-90. f. tr. Je 1920. 
Moulton, R. H. Do plants need the dark? Gard. Mag. 32: 98-99. 
O 1920.  [Illust.] ; 
Murphy, P. A., & Wortley, E. J. Relation of climate to the develop- 
ment and control of leaf roll of potato. Phytopathology 10: 407- 
44. J. 7. 1920: 
Murrill, W. A. A new Amanita. Mycologia 12: 291-292. 1920. 
Venenarius Wellsii sp. nov. 
Murrill, W. A. Autobasidiomycetes, in Britton, N. L., The Bahama 
Flora 637-645. 26 Je 1920. 
Nelson, A. Flora of the Navajo Reservation. Am. Bot. 26: 87-89. 
Au 1920. 
Nelson, J.C. Flower buds two years old. Am. Bot. 26: 99. Au 1920. 
