BRITISH JUNGERM ANNIAS. ( J . compress a. ) 
both sides of the stalk, (about two-thirds towards the front, and one-third towards the back). 
When moist, the leaves are plane, and the insides of the opposite ones touch each other, which 
gives the plant a singularly compressed appearance, and makes it refuse to lie in any position but 
its side, when examined on the table of the microscope. — In drying, the leaves become somewhat 
waved and deflected at the apex.” 
It is a curious circumstance, that the stipules should be confined (at least, as far as my own 
observations and those of Dr. Taylor have gone) to the younger innovations. Can it be that they 
exist upon the stems of the young plants, and upon the young ones only, in the same manner as the 
stipules of many phaenogamous plants, and especially of the Salices, which are seen only during an 
early stage of the foliation ? 
The paucity of radicles is a farther peculiarity which this Jungermannia has in common with 
others, which, like it, grow almost wholly in the water, and which have their stems likewise 
densely crowded. 
J. compressa ought, without doubt, to rank next J. scalaris, J. Taylori, and J. anomala, with 
the former of which it agrees in the immersed capsule. 
REFERENCES TO THE PLATE. 
FIG. 
1. J. compressa, female plant, natural size. 
2, 3. Sterile plants, natural size. 
4. Sterile plants, which have been altered in their appearance by the strength of 
the current, natural size. 
5. Female plant, magnified 
6. Portion of a young innovation, shewing the stipules 
7. Extremity of a fertile shoot 
8. A calyx, longitudinally dissected, exhibiting the inside of one row of leaves, 
with the calyptra and pistilla 
9. Seeds and spiral filaments 
