(J. bidentata.) 
BRITISH JUNGERMANNIAE. 
unfrequently be found completely destitute of this part. In J. complanata, also, the calyx is to be 
seen in an extremely diminutive state, at the same time when the pistilla are fully formed; and I 
have reason to believe that this mode of growth, far from being confined to these two plants, is 
not. unfrequent in the genus. 
Schmidel's J. bidentata I have elsewhere mentioned as belonging to J. ventricosa. 
Schreber is the first person who discovered the stipules on this species. They are sufficiently 
large to be distinguished with a small power of the microscope, and are always present, throughout 
the whole length of the plant. 
REFERENCES TO THE PLATE. 
JPIG. 
1. J. bidentata (female plant ) , natural size. 
2. Var. /3, natural size. 
3. Female plant , magnified 6 
4. Portion of a surculus and leaves 4 
5. Leaf, seen from its under surface, with a stipule 3 
6. Stipule 2 
7. Perichatial leaves 4 
8. Calyx 4 
9. Calyptra 2 
10. Seeds and spiral filaments 1 
11. Var. /3, obtusata, magnified 6 
12. Stipule of Var. 2 
13. 14. Anthers* 1 
* These anthers, it ought to be remarked, were taken out of the terminal tufts of leaves of Var. 
probably before the formation of the perigonial leaves, which have been described above. 
