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joke, without any scientific basis whatever. Even Mr. Oldberg’s report was 
supported in so meager a way, by only about one-fourth of the species listed, 
that I decided then and there on supplying as a first foundation for future 
work on the District mosses, a list accompanied by specimens deposited in 
the National Herbarium. For only on this basis can rational work be done 
in the future. 
The preparation of this list has been long delayed, owing to bread-win- 
ing duties. The great distance at which I live from Washington since 1893 
(at Winona, Minn.) has been one serious drawback. Fortunately Prof. 
Edward B. Chamberlain, for some years till recently a teacher in one of the 
Washington schools, has taken much interest in the District mosses, and has 
with much sacrifice of time, collected for my use data from the National 
Herbarium which I could not otherwise have obtained. To him and all my 
other bryological friends who have in one way or another aided in determin- 
ing and elaborating this collection, I wish here to express my heartfelt grati- 
tude. 
The list here offered for publication, is supported by material deposited 
in the National Herbarium and mostly also in my private herbarium, for 
every species cited. It is dedicated to future moss students with the earnest 
wish that in their study they may experience the same humble joy felt by 
the author in preparing it. 
ALPHABETICAL LIST OF SPECIES OF MUSCI. 
1. Amblystegium adnatum ( Hedw. ) Aust. Banks of Potomac. 
2. “ Juratzkanum Sch. Agricultural Department grounds; 
Bladensburg Road. 
3. Amblystegium Kochii B. & S. Agricultural Department grounds. 
4. “ Lescurii (Sulliv.) Aust. Banks of Potomac. 
5. “ orthocladon L. & J. Rock Creek: Fourteenth street 
extended; Glen Echo: Cabin John’s: road to Sligo. 
6. Amblystegium riparum (Hedw.) B. & S. Great Falls of the Potomac. 
7. “ serpens (Hedw.) B. & S. Rock Creek; Bladensburg Road. 
8. “ varium Lindb., represnted by various forms. Agricul- 
tural Department grounds; Glen Echo: Kendall Green; Rock 
Creek; Soldiers’ Home grounds. 
9. Anacamptodon splachnoides (Froehl.) Brid. Spencerville, Maryland. 
10. Anomodon attenuatus (Schreb.) Huebn. Glen Echo. 
11. “ minor Fuernr. Rock Creek. 
12. “ rostratus (Hedw.)Sch. Rock Creek. 
13. “ tristis (Ces.) Sulliv. (. Leskea tristis ) Rock Creek. 
14. Aulacomnium heterostichum (Hedw.) B. & S. Arlington. 
15. Barbula caespitosa (Schwaegr.) Schultz. Rock Creek; Glen Echo; Mt. 
Vernon: Ingleside: Brightwood: Spencerville, Maryland. 
16. Barbula unguiculata Hedw. Rock Creek (a form); Arlington. 
17. Bartramia pomiformis Hedw. Rock Creek. 
18. Brachythecium acuminatum (Hedw.) Kindb. Rock Creek: Spencerville, 
Maryland. 
