306 THE JOURNAL OF BOTANY 
when grown side by side under the same conditions and protected 
from cross-pollination. 
The hybrid segregates according to Mendel’s law. In one test 
culture—of seeds taken from a single individual of the hybrid 
erectus X erectus, var. radiatus—which comprised 449 plants, the 
progeny proved to be as follows :— 
erectus individuals ; ; : 
erectus var. radiatus individuals . 
hybrids, like the parent plant . = 226 
The numbers required by Mendel’s law for a culture of 448 
plants would be 112, 112, and 224. 
The hybrid erectus x squalidus appears to occur—indeed, I 
have one living specimen collected in Cathays Park, which can 
scarcely be anything else. I have failed, however, to obtain this 
hybrid experimentally. Six different experiments, extending over 
two Sy and involving the raising of hundreds of plants, produced 
no result. 
‘TWO NEW BRITISH HEPATICA. 
By Symers M. Macvicar. 
SPH ROCARPUS CALIFORNICUS. 
SPHEROCARPUS CALIFoRNICUS Austin in Bull. Torr. Club, vi. 
always distinct, 15-24 p» in diam., margin of tetrad appearing 
crenulate, without spines, the entire surface minutely granulate. 
Hab.—Garden, Birdsgrove, Woking, Surrey, leg. Mrs. Wood, 
April, 1909. 
I 
character of value, as in S. californicus they are only about 
twice as long as broad, while in S. Michelii they are 3-5 times as 
long as broad. 
In S. californicus the ridges which form the areole on the 
spores are only slightly elevated at the angles, so that in profile 
the tetrad appears as if crenulate, the intervals between the raised 
points being somewhat emarginate. In the other species the 
angles are raised into spines, the profile being spinou 
; P 
Whatever difficulty there may be in distinguishing the two 
