156 IOWA ACADEMY OF SCIENCES. 



indebted to Professor Macbride and Professor Shimek, of the 

 State University, for kind assistance; to Mrs. Britton, of the 

 Columbia University, and Prof essor Cheney, of Madison, Wis., 

 for verification of doubtful forms, and also to the collectors 

 whose names appear on the following pages. Sets of all the 

 mosses noted below are in the herbarium of the State Univer- 

 sity of Iowa, and also in the collections of the writer. Speci- 

 mens of the more common species of this list have been col- 

 lected and used in the laboratories of the university during 

 many years. More particularly, Miss Annette Slotterbec, in 

 1888, collected and identified some forty specimens. But on 

 the whole it has been deemed better to record the collection of 

 such material only as has been gathered for the preparation of 

 this paper. 



Group Bryophyta. 

 Class Musci. Order Bryacece. True mosses. 



Series!. ACROCARPI. 

 Tribe Phasce^. 



1. PImscuiit (•uspidattiin Schreb. Growing on clay hillsides 

 exposed to the sun; common in early spring. Johnson county, 

 March 13, 1897, T. E. S. 



Tribe Weisie^^^:. 



2. Astomum nitidulinn Schimp. On wet, marshy ground, 

 growing among grass and weeds; rare. Johnson county, 

 March 21, 1897, P. C. J/?/ey.s. 



3. Weisia viridula Brid. Very common on the ground, 

 fruiting throughout the year. Henry county, December 29, 

 1896, and Johnson county, March 13, 1897, T. E. *S'. ; Pottawatta- 

 mie county. May, 1897, J. E. Gaiiteron. 



4. Dicranella varia Schimp. On clay banks in open and 

 exposed places; not common Johnson county, October 17, 

 1896, T. E. S. 



5. Dicranella heteromalla Schimp. Grows on the ground, 

 often associated with species of Barbula; common. Johnson 

 coun'y, October, 1895, Professor Shimek: Johnson county, Octo- 

 ber 17, 1896, T. E. N. ; Muscatine county, November 15, 1897, 

 Shimek d- Savage. 



6. DicraniDH flar/ellare Hedw. Growing on sandy hill- 

 sides, in the shade; not commonly distributed over the state. 

 Muscatine county, November 15, 1897, T. E. S. 



