342 INDEX TO AMERICAN BOTANICAL LITERATURE 
MacDougal, D. T. Origination of self-generating matter and the influ- 
ence of aridity upon its evolutionary development. Jour. Geol. 17; 603- 
622. f. 1-5. N 1909. 
MacDougal, D. T. The origin of desert floras. In Spalding, V. M., Dis- 
tribution and movements of desert plants, 113-119. Washington, D.C. 
22 O 1909. 
Carnegie Inst. Washington, Publ. no. 113. 
McCallum, W. B. The reciprocal influence of scion and stock. Plant 
World 12: 281-286. D 1909. 
Merrill, E. D. A preliminary revision of Philippine Combretaceae. Phil- 
ippine Jour. Sci. 4: (Bot.) 641-650. N 1909. 
Nash, G. V. The Kafir-bread plants. Jour. N. Y. Bot. Gard. 10: 275- 
277. pi. 74. D 1900. 
Noyes, J. All the firs and spruces. The distinguishing traits of these 
members of the evergreen family—How to recognize the different kinds 
and where to use them in landscape work. House & Garden 16: 220, 221, 
+ x-xu. D 1909. 
Parish, S. B. Notes on some introduced plants of southern California—I. 
Muhlenbergia 5: 105-115. 30S 1909; II. Muhlenbergia 5: 121-128. 
23 O 1909. 
Pearl, R. Variation and differentiation in Ceratophyllum. 1-136. pl. 1, 2. 
Washington, D. C. 
Carnegie Inst. Washington, Publ. no. 58. 
Pollock, J.B. Notes on plant pathology. Rep. Michigan Acad. Sci. 11: 
48-54 
Includes Sclerotinia aestivalis sp. nov. 
Quehl, L. Mamillaria crucigera Mart. Monats. Kakteenk. 19: 190, I9I. 
15 
Quehl, . Mamillaria pseudoperbella Quehl n. sp. Monats. Kakteenk. 19: 
188, 189. 15 D 1909.  [Illust.] 
Native in Mexico. 
Radlkofer, L. Sapindaceae. [In Herzog, Nachtrage zu Siphonogamae 
novae bolivienses.] Repert. Nov. Spec. 7: 354-356. 15 D 1909. 
Includes new species in Urvillea and Serjania. 
Ramaley, F. The University of Colorado mountain laboratory. Univ. 
Colorado Stud. 7: 91-95. f. 1-5. D 1909. 
Rehm, H. Ascomycetes exs. fasc. 45. Ann. Myc. 7: 524-530. D 1909. 
Includes 3 new species from Wisconsin in Helotium, Ciboria, and Verpa, and 
Meliola Usteriana sp. nov. from Brazi 
Rehm, H. Ascomycetes novi. Ann. Myc. 7: 531-542. D 1909. 
Includes 30 new species, 11 from North America, and the new genera Dictyomol- 
_ ta, and Phaeofabraea. 
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