INDEX TO AMERICAN BOTANICAL LITERATURE 41 
Quehl, L. Bemerkungen iiber einige Arten von Mamillarien aus der 
Untergattung Coryphantha Engelm., Reihe Avulacothele Lem, 
Monats. Kakteenk. 22: 115-118. 15 Au 1912. 
Quehl, L. Mamillaria macrothele Mart. Monats. Kakteenk. 22: 
145-147. 15 O 1912. 
Roberts, E.W. The modern theory of the cell as a complex of organized 
units. Trans. Am. Micros. Soc. 31: 85-113. pl. 6-13 +f. A-K. 
Ap 1912. 
Robinson, C.B. Polycodium. Bull. Torrey Club 39: 549-559. 18 N 
Rolfe, R. A. Eriopsis Helenae. Curt. Bot. Mag. IV. 8: pl. 8462. 
N 1912, 
A plant from Peru. 
Rosenbaum, J. Infection experiments with Thielavia basicola on 
ginseng. Phytopathology 2: 191-196. pl. 18, 19. O 1912. 
Rusby, H.H. Newspecies from Bolivia, collected by R. S. Williams—2. 
Bull. N. Y. Bot. Gard. 8: 89-135. 23 N 1912. 
One hundred and fifteen new species are described. 
Schreiner, O. Organic constituents of soils. Science II. 36: 577-587. 
1 N 1912. 
Schreiner, O., & Skinner, J. J. The effect of guanidin on plants. 
Bull. Torrey Club 39: 535-548. f. 1-6. 18 N 1912. 
Seaver, F. J. Ancient and modern views regarding the relation of 
taxonomy to other phases of botanical work. Torreya 12: 262- 
264. I10N 1912. 
Shear, C. L. The chestnut blight fungus. Phytopathology 2: 211, 
213.0 1912. 
Sheldon, J. L. Additions to the recorded mosses of West Virginia. 
Bryologist 15: 95-97. N 1912. 
Smith, E. F. Isolation of pathogenic potato bacteria: A question of 
priority. Phytopathology 2: 213, 214. O 1912. 
South, F. W. Further notes on the fungus parasites of scale insects. 
West Ind. Bull. 12: 403-412. 18S 1912. 
Starr, A. M. Comparative anatomy of dune plants. Bot. Gaz. 54: 
265-305. f. 1-35. 15 O 1912. 
Stevens, N. E. A palm from the Upper Cretaceous of New Jersey. 
a eae sei. TV. - oe f. 1-24. N 1912. 
anchorus sp 
dase oO. "Iris RENEEN Curt. Bot. Mag. IV. 8: a6 8465. N 1912. 
Sydow, H. & P. Novae fungorum species—VIII. Ann. Myc. 10: 
nap Teas 1o Au 1912. 
Cronartium egenulum from Brazil. 
