TABLE OF CONTENTS 



I. 



ii. 

 HI. 



IV. 



V. 



VI. 

 VII. 



VIII. 



IX. 



X. 



XI. 



XII. 



XIII. 



XIV. 



XV. 



XVI. 



XVII. 



XVIII. 



XIX. 



luiibryo-sac cleveloi)nicnl and cnibryuloi^y of 



Symplocarpus foetidus, C. Otto Rosendahl. . . 1 



The seeds and seedlini; of Caulophyllum thalic- 



troides, Frederic K. Butters 11 



Intluence of physical factors on transpiration, 

 Arthur William Sampson and Louise Marie 



Allen 33 



Two Basidioniycetes new to AJinnest)ta: Exo- 

 basidium mycetophilum and Cantharellus 



retirugus, Daisy S. Hone 61 



The Pezizales. Phacidiales. and Tnberales of 



Minnesota, Daisy S. Hone 6d 



A new genus of bluegreen algae, Frederic E. 



Clements and H. LeRoy Shantz 133 



Observations on the morphology of the under- 

 ground stems of Symplocarpus and Lysichi- 

 ton, together with some notes on geographi- 

 cal distribution and relationshi]\ C. Otto Ros- 

 endahl •.•••.••• 



Some effects of severe frost upon vegetation in a 

 condition of active growth, Frederic K. But- 

 ters and C. Otto Rosendahl 153 



Notes on the species of Liagora and Galaxaura 



of the Central Pacific, Frederic K. Butters. . . 161 

 Nova fungorum coloradensium genera, Frederic 



E. Clements 185 



A study of the vegetation of the sandhills of Ne- 

 braska, Raymond J. Pool 189 



Some peculiar cases of plant distribution in the 

 Selkirk Mountains, British Columbia, Fred- 

 eric K. Butters 313 



The development of climax formations in 

 Northern Minnesota, H. F. Bergman and 



Harvey Stallard •• • 333 



The effects of certain rusts upon the transpira- 

 tion of their hosts, J. E. Weaver .3/9 



Response of micro-organisms to copper sulphate 



treatment, N. L. Huff 407 



Studies in the morphology of Yucca glauca, 



Donald Folsom , 427 



Comments on Malva rotundifolia L. and its al- 

 lies, H. F. Bergman 437 



Observations on Betula in Minnesota with spe- 

 cial reference to some natural hybrids, C. 



O. Rosendahl 443 



Reputed Minnesota plants which probably do 

 not occur in the state, C. O. Rosendahl and 



F. K. Butters • • 461 



V 



