( J . capitata.J 
BRITISH JUNGERMANNIiE. 
Capsule orate, dark brown, splitting into four equal valves. 
Seeds and spiral filaments fulvous, the latter composed of a double helix, attenuated at each 
extremity. 
It is not easy, in a specific character, to define the differences which will keep this plant 
separate from J. excisa. In the fructification, and in the form and size of many of the leaves, they 
seem perfectly to accord ; but in all the specimens I have examined, both from Ireland and the 
New Forest, the upper leaves of J. capitata are collected into a tuft or head, which gives the plant 
a very remarkable appearance : these terminal leaves, too, and most of those not inserted near the 
base of the plant, are either trifid or quadrifid, and the segments are very irregular but, what is 
more striking, the texture of the leaves is delicate, fragile, and composed of cellules as large as 
those of J. bicuspidata. In this particular it differs essentially from J. incisa, which has similar 
tufts of leaves at the extremity of the shoots j but they are never, in our plant, toothed or jagged 
at the margins of the segments. 
REFERENCES TO THE PLATE. 
FIG. 
1. Sterile plants of J. capitata, natural size. 
2. Female plant, natural size. 
3. Sterile plant, magnified 6 
4. Cauline leaves 3 
5. Cauline leaf, shewing the cellules 3 
6. Terminal leaves 3 
7. Ferichcetial leaf 3 
8. Perichcetial leaf, with pistilla appearing before the formation of the calyx . ... 3 
