INDEX TO AMERICAN BOTANICAL LITERATURE oar 
Mix, A. J. Sun-scald of fruit trees: a type of winter injury. Cornell 
Agr. Exp. Sta. Bull. 382: 237-284. pl. 78, 19+f. 60-61. O 1916. 
Morse, W. J. Studies upon the blackleg disease of the potato, with 
special reference to the relationship of the causal organisms. Jour. 
Agr. Research 8: 79-126. 15 Ja 1917. 
Murrill, W. A. New combinations. Mycologia 9: 403°. Ja ior. 
Murrill, W. A. Some fungi collected in Virginia. Mycologia 9: 34-36. 
Ja 1917. 
Murrill, W. A. Two new species of fleshy fungi. Mycologia 9: 40, rae 
Ja 1917. 
Gymnopus Ellisii and Omphalopsis pallida, spp. nov. 
Newins, H.S. The natural root grafting of conifers. Proc. Soc. Am. 
Foresters 11: 394-404. f. 1-6. O 1916. 
Oakley, R. A., & Garver,S. Medicago falcata, a yellow-flowered alfalfa. 
_ U.S. Dept. Agr. Bull. 428: 1-70. pl. 1-4+f. 1-23. 9 Ja 1917. 
Olive, E. W., & Whetzel,H.H. Endophyllum-like rusts of Porto Rico. 
Am. Jour. Bot. 4: 44-52. pl. 1-3. 3 F 1917 
Includes Botryorhiza Hippocrateae and Endophylloides portoricensis gen. et spp. 
Osterhout, W. J. V. Antagonism and permeability. Science II. 45: 
O7-103.f. a, 3 Feet): 
Osterhout, W. J. V. Similarity in the effects of potassium cyanide and 
of ether. Bot. Gaz. 63: 77-80. f. z. 15 Ja 1917. 
Palmer, E. L. A seed key to some common weeds and plants. Proc. 
Iowa Acad. Sci. 23: 335-394. pl. Q-11. 1916. 
Pammel, L. H. Notes on the weeds of California. Proc. Iowa Acad. 
Sci. 23: 489-493. I916. 
Pammel, L. H. Some notes on California forest flora. Proc. lowa 
Acad. Sci. 23: 494-518. pl. 32-38+f. 48. 1916. 
Paul, B.H. The pine blister rust. N.Y. Pub. Cons. Comm. Bull. 15: 
1-18. Jai1g17._ [Illust.] 
Pearl, R. The selection problem. Am. Nat. 51: 65-91. F 1917. 
Peck, M. E. A section of Upper Sonoran flora in northern Oregon. 
Proc. Iowa Acad. Sci. 23: 317-334. 1916. 
[Popenoe, P.] Odd plant malformaticns. Jour. Heredity 8: 63-68. 
J. @-9:. 2§ Ja‘ror7: 
Povah, A.H. W. Helicostylum and Cunninghamella: two genera of the 
Mucorales new to the state. Ann. Rept. Michigan Acad. Sci. 17: 
152-155. pl. 16,.17. 1915. 
