THE BRYOLOGIST. 
Vol. VIII. September, 1905. No. 5. 
NOTES UPON MARYLAND BRYOPHYTES AND ON TWO MOSSES 
FROM VIRGINIA. 
Edward B. Chamberlain. 
During the past year there have come to me for determination several 
packages of bryophytes which were collected at Plummer’s Island, Mary- 
land. This island is situated in the Potomac river, about nine miles from 
Washington, D. C., and has been leased by the Washington Biologist’s 
Field Club, which is now engaged upon a preliminary survey of the plant 
and animal life found thereon. Thus far but little systematic collecting has 
been made among the mosses and hepatics, and most of the specimens 
belong to the common species. The following, however, seem to be of suffi- 
cient interest to warrant special mention. Only one is reported in the 
“Guide to the Flora of Washington and Vicinity, ” by L. F. Ward (1881), 
which, as far as I know, is the last local flora including the bryophytes of this 
region. 
Specimens of all the species mentioned are in my own herbarium and in 
that of Mr. E. L. Morris. Eventually, duplicates will be placed in the 
National Herbarium. I have to thank Dr. A. W. Evans for assistance in 
determining the Ricciaceae. 
Aphanorrhegma serratum Sull. A few patches of this moss were found 
last fall by Mr. E. L. Morris and myself upon the mud-flats exposed by the 
low stage of the Potomac river. A small amount was collected also upon the 
adjacent Maryland shore, and on the Virginia shore opposite. 
Ephemerum serratum (Schreb.) Hampe. A few plants of this moss were 
found intermingled with the Aphanorrhegma , at the southern end of the 
island. Probably the minute size of the plants renders them often over- 
looked, for, while it is said to be common, it is but rarely reported. 
Grimmia campestris Burchell {G. leucophaea Grev.). Abundant upon 
bare ledges, but apparently always sterile. A few miles further up the river, 
at Great Falls, Maryland, the same species is even more abundant and occa- 
sionally fertile. 
Thelia Lescurii Sulliv. On sandy ground in dry situations and abund- 
antly fruited. 
Riccia crystallina Schwein. This species, together with R. Sullivantii 
Austin, grew upon the wet bare mud of the river bank. Dr. Evans writes 
that R. crystallina , though widely distributed, is but rarely collected in the 
United States. Both species were in fruit. 
Ricciocarpus natans (L.) Corda. The terrestrial form known as Riccia 
lutescens Schwein., grew quite commonly with the Riccias mentioned above, 
being very conspicuous because of its large green crinckled thalli, often 
more than an inch in diameter. As Riccia lutescens , it is reported in Ward’s 
The July BRYOLOGIST was issued July 15th, 1905. 
