TABLE OF CONTENTS. 



I. Contributions to a knowledge of the lichens of Min- 

 nesota. III. The rock lichens of Taylors Falls, 

 Bruce Fink ....... I 



II. A method of determining the abundance of second- 

 ary species, Roscoe Pound and Frederic E. 

 Clements . . . . . . . 19 



III. List of fresh-water alga3 collected in Minnesota dur- 



ing 1896 and 1897, Josephine E. Tilden . . 25 



IV. Corrections and additions to the flora of Minnesota, 



A. A, Heller 30 



V. New and interesting species from New Mexico, A. 



A. Heller 33 



VI. Some Musci of the International Boundary, John 



M. Holzinger ....... 36 



VII. The influence of gases and vapors on the growth of 



plants, Emil P. Sandsten . . . -53 



VIII. Seedlings of certain woody plants, Francis Ramaley 69 

 IX. Comparative anatomy of hypocotyl and epicotyl in 



woody plants, Francis Ramaley . . 87 



X. Contribution to the life-history of Ruinex, Bruce 



Fink 137 



XI. Observations on Gigartina, Mary E. Olson . . 154 

 XII. Seed dissemination and distribution of Razoumofskya 



robusta (Engelm.) Kuntze, D. T. MacDougal . 169 



XIII. Observations on Constantinea, E. M. Freeman . 175 



XIV. Extension of plant ranges in the upper Minnesota 



valley, L. R. Moyer ... .191 



XV. List of Hepaticae collected along the international 

 boundary by J. M. Holzinger, 1897, Alexander 

 W. Evans ... 193 



XVI. Observations on Chlorochytrium, E. M. Freeman. 195 

 XVII. Observations on Rhodymenia, Frederic K. Butters. 205 

 XVIII. Contributions to a knowledge of the lichens of Min- 

 nesota. IV. Lichens of the Lake Superior re- 

 gion, Bruce Fink . . . -215 

 XIX. Contributions to a knowledge of the lichens of Min- 

 nesota. V. Lichens of the Minnesota valley and 

 southwestern Minnesota, Bruce Fink . . 277 



