( J . emarginata.J 
BRITISH JUNGERMANNIiE. 
The perigonial leaves differ in no respect from the rest, except in having a ventricose 
base. 
Perichcetial leaves attached to the exterior surface of the calyx on which they grow, and 
surround it on all sides, so as entirely to conceal it : they are erect and smaller than 
the cauline leaves, but, in other respects, much resembling them; the inner ones, 
however, are less deeply emarginat.e. 
Male Fructification situated in the axillse of the perigonial leaves, and mostly near the 
extremity of the stem. Anthers (f. f. 6. 7) spherical , reticulated ; before the discharge of the 
pollen of a pale dirty-green, afterwards a yellow-brown. The footstalk about the length of the 
anther, white and transversely stiiated. 
Female Fructification terminal. 
Calyx (f. 8) ovate, immersed in the perichsetial leaves, of a thick carnose substance, in 
consequence of the united bases of these leaves ; the mouth alone free and membranous, 
and, as may be seen by a careful section of the calyx and its covering, cut into six or 
eight rather large teeth, two of which, I have, in several instances, observed to arise 
from a larger interior appendage, somewhat resembling a leaf, but much narrower, 
plane, and scarcely emarginate at the extremity. 
Calyptra ovate, whitish, delicate, reticulated, surrounded at the base by a few abortive 
pistilla. 
Peduncle seldom exceeding half an inch in length, white, shining, transversely and 
longitudinally striated, terminated by a roundish 
Capsule of a brown color, furrowed on its exterior surface, and opening into four equal 
ovate valves. 
Seeds (f. 10) spherical, fulvous, accompanied with spiral filaments of the same color, 
composed of a double helix. 
It is remarked by Dr. Smith, in English Botany, upon the authority of the Linnaean 
Herbarium, that this species was first found and named by Dr. Swartz, many years before it was 
published by Ehrhart. The same eminent Swedish Naturalist, who has sent me many specimens, 
has, farther, looked upon the luxuriant and dark green appearance of this plant as a distinct 
variety, and in his manuscript has named it /3 aquatica * Yet, notwithstanding such high 
authority, I find intermediate states of the plant so common, and the gradations between them 
so imperceptible, arising solely from the greater or less degree of moisture with which they are 
supplied, that I am induced rather to include the /3 of Swartz in my general description, than 
follow his example in separating it. The name given to this species by our countryman, 
Mr. Dickson, who published it as new in his second fasciculus, is so expressive of one of the 
most obvious of its characters, that there is much reason to regret the necessity of laying it aside. 
* ° r ' Schrader a,so describes what he considers a singular variety, found by him in the Hercynian Forest, in the 
following terms: “ Hujus insignis varietas in Hercynia rivulorum saxis provenit, qua surculis fluitantibus, 
ramosioribus, ab unciali ad biuncialem longitudinem protensis, et foliis laxioribus atro viridibus distinguitur ” 
Spic. FI. Germ. p. 75. 
