116 INDEX TO AMERICAN BOTANICAL LITERATURE 
Mackenzie, K. K. Notes on Carex—IX. Bull. Torrey Club 42: 603- 
624%, -11-D 1015. . 
Eight new species are described, 
Muenscher, W. L. C. <A Study of the relation of transpiration to the 
size and number of stomata. Am. Jour. Bot. 2: 487-504. f. 1-3. 
16 D 1915. 
Mulsow, F. W. Differentiation of the oaks by histological methods. 
Kansas Univ. Sci. Bull. 9: 271-277. pi. 60-65. S 1915. 
Wieuwland, J. A. Records of adventive plants. Am. Mid. Nat. 4: 
290. WN Ios. 
Orton, C. R., & Adams, J. F. Collar-blight and related forms of fire- 
blight. Pennsylvania Agr. Exp. Sta. Bull. 136: 1-23. f. ij. 
Au I9I5. 
Overholts, L. O. Comparative studies in the Polyporaceae. Ann. — 
Missouri Bot. Gard. 2: 667-730. pl. 23-25+f. 1-8. N 1915. 
Pennington, L. H. New York species of Marasmius. N. Y. State 
Mus. Bull. 179: 52-79. 15 D 1915. 
Pieters, A. J. New species of Achlya and of Saprolegnia. Bot. Gaz. 
60: 483-490. pl. 2r. 16 D IQ15. 
Achlya Klebsiana and Saprolegnia Kaufmanniana, spp. noy., are described. 
Pieters, A. J. The relation between vegetative vigor and reproduction 
in some Saprolegniaceae. Am. Jour. Bot. 2: 529-576. f. T, % 
D rots. 
Pittier, H. On the characters and relationships of the genus Monopterys 
Spruce. Bull. Torrey Club 42: 623-627. f. 4, 2.. 11 D 19f5. 
Monopteryx Jahnii sp. nov. is described. 
Pool, R. J. A brief sketch of the life and work of Charles Edwin 
Bessey. Am. Jour. Bot. 2: 505-518. pl. 78. D 1915. 
Rehder, A. The Bradley bibliography 3: i-x+1—806. 1915. 
Arboriculture. 
Roig y Mesa, J. T. El marabi o Aroma. Cuba Estac. Exp. Agro 
Cire. 50: 1-16. pl. r-z0. 1915. 
Rydberg, P. A. Phytogeographical notes on the Rocky Mountain 
region. V. Grasslands of the Subalpine and Montane Zones. Bull. 
Torrey Club 42: 629-642. 11D I9I5. ‘ 
Shedd, O. M. Variations in mineral composition of sap, leaves, and 
stems of the wild-grape vine and sugar-maple tree. Jour. Agt — 
Research §: 529-542. 20D 1915. 
