202 Rhodora [OCTOBER 
less admixture with F. eboracensis. According to our present knowl- 
edge F. inflata is confined to the United States. Its range extends 
from Connecticut westward to Minnesota and southward to the 
District of Columbia, Mississippi and New Mexico. It strongly 
resembles F. eboracensis but differs in its autoicous inflorescence and 
in its leaf-cells, which have trigones but no intermediate thickenings. 
In F. eboracensis the inflorescence is dioicous and the leaf-cells have 
thickenings of both types, thus making the contours of the cell- 
cavities irregular. 
9. FRULLANIA SAXICOLA Aust., Proc. Acad. Philadelphia for 1869: 
225. On trap rocks. Woodbridge, Connecticut (A. W. E.). The 
present species was based on specimens collected by Austin near 
Closter, New Jersey. He afterwards found it near Little Falls in 
the same state and distributed specimens, presumably from these two 
localities, in Hep. Bor.-Amer. 104. The only other specimens which 
he quoted were collected by Wright in Texas. The plants distributed 
by Austin are more or less mixed with the form of F. eboracensis 
which, as F. virginica, used to be considered a distinct species. When 
the writer revised the North American species of Frullania, thirteen 
years ago, the specimen of this number which he examined was 
practically pure F. virginica, and on this basis Austin’s species was 
reduced to F. virginica as a synonym.! A recent study of the same 
number in another set, where the admixture is less, shows conclu- 
sively that this reduction was unwarranted and that F. saxicola 
should be again recognized as a distinct species. The rocks where 
the Woodbridge specimens grow are near the bottom of a talus slope 
and are more or less exposed to the sun. This locality and those 
quoted by Austin are the only ones that can be cited at the present 
time. 
The relationships of F. saxicola are with F. inflata rather than with 
F. eboracensis, although all three belong to the subgenus Trachycolea 
of Spruce. It agrees with F. inflata in the following important char- 
acters: the leaf-lobes are rounded but not cordate at the antical base; 
the leaf-cells have trigones but no intermediate thickenings; the 
inflorescence is autoicous; the perianth is pluriplicate with uneven 
but not tuberculate keels. The lobules of the leaves are almost 
invariably explanate in F. saxicola and are in the form of small lanceo- 
t Trans. Conn. Acad. 10: 17.. 1897. 
