TABLE OF CONTENTS 



I. Prefatory note, by The Editor 1 



II. On the occurrence of sphagnum atolls In central 



Minnesota, by Conavay MacMillan 2 



III. Some extensions of plant ranges, by E. P. Sheldon. 14 



IV. On the nomenclature of some North American species 



of Astragalus, by E. P. Sheldon 19 



V. List of fresh water algae collected in Minnesota dur- 

 ing 1893, by Josephine E. Tilden 25 



Vf . On the poisonous influence of Cypripedium spectabile 



and Cypripedium pubescens, by D. T. MacDougal. 32 

 VII. Nitrogen assimilation by Isopyrum biternatum, by 



D. T. MacDougal 39 



VIII. On the morphology of hepatic elaters. with special 



reference to branching elaters of Conocephalus 



conicus, by Josephine E. Tilden 43 



IX, Revised descriptions of the Minnesota Astragali, by 



E. P. Sheldon 54 



X. Synonymy of the North American species of Juncodes, 



with further nomenclatural notes on Astragalus, 



by E. P. Sheldon 62 



XI. Further extensions of plant ranges, by E. P. Sheldon. 66 

 XII. Determinations of some Minnesota lichens, by W. D. 



Fkost 81 



XIII. A revision of the Mucoraceae with especial reference 



to species reported from North America, by Ro§coe 

 Pound 87 



XIV. Revision of the Minnesota grasses of the tribe Hor- 



deae, by Francis Ramaley 105 



XV. A prelimary list of the North American species of 



Astragalus, by E. P. Sheldon 116 



XVI. On a new registering balance, by A. P. Anderson. . . 177 

 XVII, On a new electrical auxanometer and continuous 



recorder, by W. D. Frost 181 



XVIII. Titles of literature concerning the fixation of free 



nitrogen by plants, by D. T. MacDougal 188 



XIX. Compilation of records of some Minnesota flowering 



plants, by E. P. Sheldon 223 



XX. List of fresh-water algae collected in Minnesota dur- 

 ing 1894, by Josephine E. Tilden 228 



