—29 
belongs becomes apparent. Turning then to the third part of the Key, he 
observes the general aspects of the plant, color, texture, relations of the 
plant to substratum, cellular structure, habitat, etc., and with the accom- 
panying illustrations to aid finds its specific name. The thalloid liverworts 
are first examined with regard to the shape of the thallus, whether the 
dorsal side possesses stomata or gemmae, and whether there are scales on the 
ventral side: the shape and placing of the involucre, whether immersed, 
sessile or stipitate ; the shape of the opened capsule. The species of the family 
Ricciaceae are illustrated with outline drawings of the whole plant and with 
cross-sections of the thallus : while the species of the genus Fossombronia 
are determined by the characteristic markings and shape of the spores. 
There are two hundred and fourteen species given. So many of the French 
species are also inhabitants of America that this quarto should prove service- 
able to our own students of the Hepaticae. Caroline Coventry Haynes. 
GRIMMIA GLAUCA.— A NEW SPECIES OR A HYBRID. 
John M. Holzinger. 
Under this title Mr. Jules 
Cardot, in Rev. Bryol. 1905, p. 
17, discusses and describes a 
sterile Grimmia found by him 
and Mr. Longuet near Charle- 
ville, in the Ardennes, north- 
ern France. On Aug. 23, 1905, 
the writer collected a sterile 
Grimmia on a ledge of lime 
rock left exposed by the gen- 
eral glacial mantle, and strewn 
with detached boulders of the 
same material, standing above 
the general level of the prairie, 
three miles due south of Lewis- 
ton, Winona County, Minn., 
about twenty miles from Win- 
ona, on the C. & N. W. Ry. 
The plants occurred quite 
abundantly, in loose cushions 
one to three inches in diame- 
ter. Their appearance sug- 
gested G. leucophaea, which 
was collected by the writer at 
Taylor’s Falls, on the eastern 
border of Minnesota, and in 
the valley of the Upper Min- 
nesota River, both at Montevideo and at Ortonville, on the western border 
o£ the State. But it was recognized, even in the field, that these plants were 
From Cardot' s illustration in Revue 
Bryologique. 
