350 INDEX TO AMERICAN BOTANICAL LITERATURE 
Matz, J. Ultimos desarrollos en la patologia de la cafia de azucar- 
Puerto Rico Dept. Agric. y Trab. Circ. 33: 32-36. D 1920. 
Mazza, A. Aggiunte al saggio di algologia oceanica (Florideae). 
Nuov. Notar. 32: 73-132. 1921. 
Includes Fauchea Fryeana sp. nov., from Washington. 
Merrill, E. D. A new genus of Myrsinaceae from the Philippines. 
Philipp. Jour. Sci. 17: 605, 606. 20 Ap 1921. 
A poia gen. nov. 
Merrill, E. D. Studies on Philippine Rubiaceae, IV. Philipp. Jour. 
Sci. 17: 425-485. N 1920. 
Murill, W. A. Cacti and their uses. Sci. Am. 124: 492, 499, 500. 
18 Je 1921 [Illust.]. 
Nash, G. V. Koelreuteria paniculata. Addisonia 5: 61, 62. pl. Igr. 
18 Je 1921. 
Nash, G. V. Pinus Thunbergii. Addisonia §: 55, 56. pl. 188. 18 Je 
1921. , 
Nash, G. V. Pierostyrax hispida. Addisonia 5: 59, 60. pl. 190. 18 
Je 1921. 
Nash, G. V. Rosa ‘Edith Cavell.’ Addisonia 5: 49. pl. 185. 18 Je 
1921. 
Orla-Jensen,S. The main lines of the natural bacterial system. Jour. 
Bact. 6: 263-273. My 1921. 
Pammel, L. H. The native white pine of lowa. Ames For. 9: 30-32. 
192!I. 
Pennell, F. W. Penstemon secundiflorus. Addisonia 5: 53, 54. Pl. 
187.. 18 Je 1921. 
Plate is of P. unilateralis Rydb., although the text describes P. secundiflorus 
Benth, 
Piper, C. V. Some new plants from the Pacific Northwest. Proc. 
Biol. Soc. Washington 33: 103-106. 30 D 1920. 
Includes new species in Erysimum (1), Arabis (1), Castilleja (2), Aster (1). 
Achillea (1), and Arnica (3). 
Priore, G. L. Il verderame dei tabacchi occidentali. Boll. Tecn. R. 
Istit. Sci. Sperim. Tabacco 18: 3-11. 
Rand, F. V., & Cash, L. C. Stewart’s disease of corn. Jour. Agr. 
Research 21: 263, 264. 16 My 1921. 
Ridlon, H. C. A season’s botanizing in Bennington [Vermont]. Ver- 
mont Bot. and Bird Clubs Joint Bull. 7: 19-21. Ap 1921. 
Rose, J. N. Epiphyllum Hookeri. Addisonia §: 63, 64. pl. 192. 18 
Je 1921. 
