80 Rhodora [May 
Plants to 15 mm. in height, caespitose or densely gregarious. 
Hab. Among the stones in the sand by the seashore, Baker 
Island near Mt. Desert, Maine. Collected by E. L. Rand, July 15, 
1898. 
This very distinct moss is an interesting addition to the genus Pottia. 
The unequal capsule with oblique mouth, the conspicuous collum, and 
the evident border to the leaves are marked characteristics. 
I first named it from Barnes’ Key P. Z/era/ís, Mitt. and sent 
specimens to Mr. Mitten for verification; he kindly returned me 
several specimens of P. Z//fera/is and allied species, saying that this did 
not appear to agree with any of them, which fact was evident to me 
after looking at his P. Z//fera/is. 
I take pleasure in naming it for Mr. Rand whose work on the 
Flora of Mt. Desert is so well-known. 
READVILLE, Mass. . 
EXPLANATION OF PLATE 5.— Pottía Aandii- fig. 1, plant, natural size; fig. 2, 
plant, enlarged; fig. 3, calyptra; fig. 4, fruit; fig. 5, empty capsule; fig. 6, leaf; fig. 
7, leaf showing areolation; fig. 8, antheridia; fig. 9, archegonia; fig. 10, cross-sec- 
tion ofleaf. Figs. 2-10 are all enlarged. 
SOME ADDITIONS TO THE * FLORA OF MIDDLESEX 
COUNTY, MASSACHUSETTS." 
MABEL PRISCILLA COOK. 
Four seasons of botanical work by Miss E. L. Shaw and the writer 
in the vicinity of Lexington, Mass., have shown how exhaustive was the 
work of Messrs. Dame and Collins and their associates in the prepara- 
tion of the Flora. During this period only ten species of phaenoga- 
mous plants from the region of Lexington have been added to the 
county list; and new localities for species already listed have been so 
rarely found as to prove of considerable local interest. In the accom- 
panying notes asterisks denote species not credited in the Flora to 
Middlesex County. In the remaining notes additional stations are 
given for some species rare or not reported as of general occurrence in 
the county. As far as possible, the nomenclature of the Synoptical 
Flora of North America has been followed. 
* Anemone Canadensis, L., has been found for several seasons in two 
distinct stations. 4. cylindrica, Gray, occurs on a hill in the south of 
Lexington. 
