72 Rhodora [APRIL 
lobes of its leaves, and by its smaller leaf-cells with indistinct trigones. 
Apparently the nearest ally of S. apiculata in North America is S. 
glaucocephala (Tayl.) Aust., which has been reported from New Eng- 
land without definite stations. In this species the gemmae are usually 
unicellular and are very similar to those just described. They are 
found, however, on modified flagelliform shoots bearing small and 
distant leaves. The normal feaf-cells are of about the same size as in 
S. apiculata, but their trigones are minute and scarcely evident. On 
the gemmiparous branches the cells which give rise to the gemmae 
are much larger than the others and show strongly thickened walls, 
but even here there are no distinct trigones. S. apiculata should be 
looked for in other parts of New England, especially in mountainous 
regions. 
12. FnurLANIA Tamarisci (L.) Dumort. The relationship 
between the present species and F. Asagrayana Mont. is so close 
that it is very difficult to draw a line of demarcation separating them. 
In the writer's Revision of the North American Species of Frullania,! 
certain characters derived from the basal auricles of the underleaves 
and from the lobules of the leaves and bracts are emphasized as dif- 
ferential. In F. Tamarisci, for example, the auricles of the under- 
leaves and the large stylus of the lobule are described as crispate, 
while the lobules of the bracts are said to bear clusters of fine cilia 
at the base instead of distinct segments. In F. Asagrayana, on the 
other hand, the auricles (even when present) and the styluses are said 
to be never crispate, while the basal segments of the bracteal lobules 
are described as being well developed. In a recent letter Mr. S. M. 
Maevicar, of Invermoidart, Scotland, has called attention to the fact 
that these differential characters are by no means constant. In sup- 
port of his statement he has kindly communicated specimens of a 
Scotch form of F. Tamarisci in which the underleaves and the lobules 
of the ordinary leaves are essentially like those in F. Asagrayana, and 
in which the lobules of the bracts bear distinct basal segments. That 
this form belongs to F. Tamarisci and not to F. Asagrayana is shown 
by the sharply pointed leaf-lobes and by the more or less irregular 
arrangement of their ocelli, the lobes in F. A sagrayana being normally 
rounded at the apex and developing ocelli in a nerve-like row. Ap- 
parently these slight and relative differences are all that remain to 
distinguish the two species, and it becomes a question whether to 
1 Trans. Conn. Acad. 10: 27. 1897. 
