CONTENTS. 



1. Embryo-sac development and embryology of Symplocarpus 



foetidus, C. Otto Rosendahl ------- i 



2. The seeds and seedling of Caulophyllum thalictroides, Fred- 



eric K. Butters ---------- ii 



3. Influence of physical factors on transpiration, Arthur Wil- 



liam Sampson and Louise Marie Allen ----- 33 



4. Two Basidiomycetes new to Minnesota : Exobasidium myce- 



tophilum and Cantharellus retirugus, Daisy S. Hone - 61 



5. The Pezizales, Phacidiales, and Tuberales of Minnesota, 



Daisy S. Hone ---------- 65 



6. A new genus of bluegreen Algae, Frederic E. Clements and 



H. Le Rov Shantz --------- I33 



