LIBRARY 

 *' W YORK 



CONTRIBUTIONS FROM 



THE OSBORN BOTANICAL LABORATORY 



1922-1923 



1. EVANS, A. W. Recent studies on certain species of Riccia. 



Bryologist 25: 81-86. September, 1921. [Omitted from 

 1920-1921 series.] 



2. PATON, J. B. Pollen and pollen enzymes. Amer. Jour. 



Bot. 9: 471-501. January, 1922. 



3. NICHOLS, G. E. The Bryophytes of Michigan, with partic- 



ular reference to the Douglas Lake region. Bryologist 25: 

 41-58. May, 1922. 



4. HYLANDER, C. J. A mid-Devonian Callixylon. Amer. Jour. 



Sci. 4: 315-321. f. I -6. October, 1922. 



5. HYLANDER, C. J. A preliminary report on the desmids of 



Connecticut. Rhodora 24: 213-224, 236-241. November 

 and December, 1922. 



6. NICHOLS, G. E. The Musch rain-correcting mounting for 



porous porcelain atmometers. Science 57: 26-28. Janu- 

 ary, 1923. 



7. BROWN, E. D. W. Apogamv in Phegopteris polypodioides. 



Bull. Torrey Club 50: 17-34. /. 1-20. January, 1923. 



8. NICHOLS. G. E. A working basis for the ecological classi- 



fication of plant communities. Ecology 4: 11-23, 154-179. 

 January and April, 1923. 



9. SEIFRIZ, W. Observations on the causes of gregarious 



flowering in plants. Amer. Jour. Bot. 10: 93-112. pi. 12. 

 February, 1923. 



