156 
IOWA AC:\DEMY OF SCIENCES. 
indebted to Professor Macbride and Professor Shimek, of the 
State University, for kind assistance; to Mrs. Britton, of the 
Columbia University, and Professor 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 I. ACROCARPI. 
Tribe Phasce^. 
1. PliasGum cuspiclatum Schreb. Growing on clay hillsides 
exposed to the sun; common in early spring. Johnson county, 
March 13, 1897, T. E. S. 
Tribe Weisiea5. 
2. Astomum nitkluluin Schimp. On wet, mai^shy ground, 
growing among grass and weeds; rare. Johnson county, 
March 21, 1897, P. C. Myers. 
3. Weisia viriclula Brid. Very common on the ground, 
fruiting throughout the year. Henry county, December 29, 
1896, and Johnson county, March 13, 1897, T. E. P.; Pottawatta- 
mie county. May, 1897, J. E. Cameron. 
4. Dicranella varia Schimp. On clay banks in open and 
exposed places; not common. Johnson county, October 17, 
1896, T. E. S. 
5. Dicranella lieteromalla Schimp. Grows on the ground, 
often associated with species of Barbula; common. Johnson 
counry, October, 1895, Professor Shimek; Johnson county, Octo- 
ber 17, 1896, T. E. S.; Muscatine county, November 15, 1897, 
Shimek & Savage. 
6. Dicranum Jiagellare Hedw. Growing on sandy hill- 
sides, in the shade; not commonly distributed over the state. 
Muscatine county, November 15, 1897, T. E. S. 
