260 INDEX TO AMERICAN BOTANICAL LITERATURE 
Meyer, R. Die Unterscheidungsmerkmale der Arten in der Unter- 
gattung Malacocarpus K. Sch. Monatsschr. Kakteenk. 27: 49-52. 
Ap 1917. 
Meyer, R. Uber Melocactus communis Lk. et Otto. Monatsschr. 
Kakteenk. 26: 114-120. Au 1g16._ [lIllust.] 
Mez, C. Additamenta monographica 1919. II. Lauraceae. III. 
Myrsinaceae. Repert. Sp. Nov. Regn. Veg. 16: 305-312. 30 Ap 
I 
Sot American species in Ajouea, Acrodiclidium, Silvia, Endlicheria, Ocotea, 
Nectandra, and Ardisia. 
Miles, L. E. Leaf spots of the elm. Bot. Gaz. 71: 161-196. pl. 8-ro. 
17 Mr 1921. 
Includes 2 new species of Gloeosporium. 
Moulton, R. H. A remarkable twin tree. Gard. Mag. 33: 50. Mr 
1921. [Illust.] 
Close association of oak and elm. 
Murrill, W. A. A double mushroom. Mycologia 13: 119-122. f. 1-3. 
26 Mr 1921. 
Agaricus campester. 
Murrill, W. A. Two species of Fuscoporia. Mycologia 13: 119. 26 
Mr 1921 
2 new combinations. 
Noack, K. L. Untersuchungen iiber die Individualitat der. Plastiden 
bei Phanerogamen. Zeitschr. Bot. 13: 1-35. pl. 1, 2+/f. I-3. 
1921. : 
Among species studied is Elodea canadensis. 
Nordhagen, R. Om nomenklatur og begrepsdannelse i plantesocio- 
logien. Nyt Mag. Naturvid. 57: 17-128. 11 F 1920. 
Norton, J. B. Liliaceae. In Sargent, C. S., Plantae Wilsonianae 3: 
1-13. 8 My 1916. 
Rehder, A. Aceraceae. In Sargent, C. S., Plantae Wilsonianae 1: 
83-98. 31 Jl 1911. 
Rehder, A. Alangiaceae. In Sargent, C. S., Plantae Wilsonianae 2: 
552-554. 30 Mr 1916. 
Rehder, A. Bignoniaceae. In Sargent, C. S., Plantae Wilsonianae 1: 
303-305. 30 Ap 1912. 
Rehder, A. Caprifoliaceae. In Sargent, C. S., Plantae Wilsonianae 1: 
106-144. 31 Jl 1911; 1: 306-312. 40 Ap 1912; 2: 617-619. 30 
Mr 1916. 
Rehder, A. Cardiandra. In Sargent, C. S., Plantae Wilsonianae 1: 
24. 3% JI 4911. 
