TABLE OF CONTENTS 



£^No. 151. Studies on the Rocky Mountain Flora — XXVI, by Per Axel 

 Rydberg. 

 /£..No. 152. The Genus Struthiopteris and its Representatives in North 

 America, by Jean Broadhurst. 



No. 153. Studies on the Rocky Mountain Flora— XXVII, by Per 

 Axel Rydberg. 

 ' No. 154. Biochemical Studies of Soils subjected to dry Heat, by Fred 

 J. Seaver and Ernest D. Clark. 

 No. 155. Polycodium, by C. B. Robinson. 



/?/3No. 156. Studies on the Rocky Mountain Flora— XXVIII, by Per 

 Axel Rydberg. 

 3 No. 157. New Ferns from Tropical America — II, by Margaret Slosson. 



/?/3No. 158- Studies on West Indian Vernonieae, with one new Species 

 from Mexico, by Henry Allan Gleason. 

 9/3 No. 159. A case of Bud-Variation in Pelargonium, by A. B. Stout. 



; No. 160. Studies on the Rocky Mountain Flora— XXIX, by Per Axel 

 Rydberg. 

 /t/h No. 161. West Indian Mosses — I, by Elizabeth Gertrude Britton. 

 3 No. 162. Phytogeographical Notes on the Rocky Mountain Region — 



I. Alpine Region, by P. A. Rydberg. 



°) No. 163. New Ferns from Tropical America — III, by Margaret 

 Slosson. 



f/>-fNo 164. Studies of West Indian Plants— V, by Nathaniel Lord 

 Britton. 

 -. No. 165. Central American Mosses, by Elizabeth Gertrude Britton 

 and Robert Statham Williams. 



No. 166. Studies of Plant Growth in heated Soil, by Guy West Wilson. 



\Q\\ u| No. 167. The Identity of the Anthracnose of Grasses in the United 



States, by Guy West Wilson. 

 /9/4No. 168. Phytogeographical Notes on the Rocky Mountain Region — 



II. Origin of the Alpine Flora, by P. A. Rydberg. 



<-|No. 169. Some Midwinter Algae of Long Island Sound, by Marshall 



A. Howe. 

 i No. 170. Notes on Rosaceae — VII, by Per Axel Rydberg. 



. No. 171. A Revision of the Genus Vittaria J. E. Smith, by Ralph C. 



Benedict. 

 f- No. 172. Phytogeographical Notes on the Rocky Mountain Region — 



III. Formations in the Alpine Zone, by P. A. Rydberg. 

 r No. 173. Notes on Rosaceae— VIII, by Per Axel Rydberg. ' 



p No. 174. West Indian Mosses — II. Mosses of the Danish West 



Indies and Virgin Islands, by Elizabeth Gertrude Britton. 



-"No. 175. The Vegetation of Mona Island, by Nathaniel Lord Britton. 



