( 205 ) 
and comprising xiii + 319 pages with 176 figures, was issued 
January 20, 1903. 
Contrisutions No. 31-48 have been printed during the 
year, and include the following papers: 
No. 31. A fossil petal and a fossil fruit from the Creta- 
ceous (Dakota group) of Kansas, by Dr. Arthur Hollick. 
No. 32. The Polyporaceze of North America—II. The 
genus Pyropolyporus, by Dr. W. A. Murrill. 
No. 33. Studies in the Asclepiadacee, by Miss A. M. 
Vail. 
No. 34. The genus /tve//a with descriptions of new 
species from North America and the Canary Islands, by Dr. 
M. A. Howe and Prof. L. M. Underwood. 
No. 35. The Polyporacee of North America—ITU. The 
genus /omes, by Dr. W. A. Murrill. 
No. 36. Studies on the Rocky Mountain flora— X, by 
Dr. P. A. Rydberg. 
No. 37. Some generic segregations, by Dr. Per Axel 
Rydberg. 
No. 38. The Polyporacee of North America—IV. The 
genus Lifvingza, by Dr. W. A. Murrill 
No. 39. A preliminary enumeration of the grasses of 
Porto Rico, by George V. Nash. 
No. 40. The phyllodes of Oxypolis fliformis, a swamp 
xerophyte, by Miss Rosina J. Rennert. 
No. 41. The Polyporaceae of North America—V. The 
genera Peale ee Scutiger and Porodriscus, 
by Dr. W. A. Murrill 
No. 42. A revision of the family Fouquieriaceae, by 
George V. Nash. 
No. 43. Some correlations of leaves, by Dr. D. T. Mac- 
Dougal. 
No. 44. Soil-temperatures and vegetation, by Dr. D. T. 
MacDougal. 
No. 45. Studies in plant hybrids, by Dr. W. A. Cannon. 
