50 INDEX TO AMERICAN BOTANICAL LITERATURE 
Shull, G. H. Bursa Bursa-pastoris and Bursa Heegeri: biotypes and 
hybrids. Carnegie Instit. Washington Publ. 112: 1-57. pl. 1-4 + f. 
I-23. 1909. 
Skottsberg, C. Botanische Ergebnisse der Schwedischen Expedition 
nach Patagonien und dem Feuerlande 1907-1909. VIII. Marine 
Algae 1. Phaeophyceae. Kungl. Svenska Loi amt me Handl. 
611!: 1-56. f. 1-20. see 
Includes Gononema and Cladochroa, gen. nov., and new species in Streblonema we: 
Myrionema (2), Lithoderma A Ralfsia (1), pee BRE (2), Mesogloea (1), Scyto 
thamnus (1). 
Small, J. K. Old trails and new discoveries. Jour. New York Bot 
Gard. 22: 25-40. pl. 253, 254. . F 1921; 22: 49-64. pl. 255, 2506. 
Mr 1921. 
Collecting in southern Florida. Includes Diospyros Mosieri, sp. nov. 
Smith, E. F., & McKenney, R. E. B. A dangerous tobacco disease 
appears in the United States. U.S. Dept. Agr. Dept. Circ. 174: 
1-6. Ap 1921. 
Snell, W. H. The relation of the moisture content of wood to its decay, 
with special reference to the spraying of log piles. Pulp and Paper 
Mag. 19: 531-533-f. Z, 2. 19 My rg2t. 
Standley, P. C. Flora of Glacier National Park, Montana. Contrib. 
U.S. Nat. Herb. 22: 235-438 + I--XVII. pl. 33-52. 1921. 
Standley, P. C. Rubiaceae (pars). N. Am. FI. 32: 87-158. 10 My 
1921. 
Includes new species in Pinarophyllon (1), Deppea (1), Bouvardia (12), Ravnia (1), 
Hillia (1), Exostema (5), and Tontanea (1). 
Steil, W. N. The distribution of the archegonia and the antheridia 
on the prothallia of some homosporous leptosporangiate ferns. 
Trans. Am. Micros. Soc. 38: 271-273. O 1919. 
Steil,W. N. Secondary prothallia of Nephrodium hirtipes Hk. Trans. 
Am. Micros. Soc. 38: 229-234. pl. 25, 26. Jl 1919. 
Stevenson, J. A. Enfermedades del citro en Puerto Rico. Revista 
Agric. spate: Rico 4°: 9-19. Je 1920. 
(Corrected reprint.] 
% 
Stockberger, - W. Ginseng culture. U.S. Dept. Agr. Farmers’ Bull. 
1184: I-16. f. I-3. Ap 1921. 
Strausbaugh, P. D. Dormancy and hardiness in the plum. Bot. 
Gaz. 71: 337-357. f. 1-4.. 16 My 1921. 
Strayer, O. B. Rejuvenating pecan trees. Am. For. 27: 238. Ap 
192Ts 
