( J. Mackaii.J 
BRITISH JUNGERMANNIjE. 
roundish areolae or cellules, and so regular in size, as to give the leaf an extremely 
beautiful appearance under the microscope. When dry, the whole surface appears to be 
elegantly punctated, in consequence of the sinking in of the centre of the cellules, and, 
when saturated afresh, a dark spot may be seen in each cellule, where the coloring 
matter has been precipitated. The general color of the leaves is an olive-green, more or 
less dark, frequently approaching to black. 
Peri^onial leaves (f. 5) more crowded and closely imbricated than the rest, and the lesser 
lobe is of a somewhat larger size ; in which particulars alone they differ. 
Perichietial leaves (f. 6) also bear a close resemblance to the cauline ones, but they are 
somewhat larger, and are furnished with a lobule nearly equal to one half of the size 
of the lobe : the latter is appressed to the superior, as the former is to the inferior, surface, 
of the calyx. 
Stipules large, roundish, entire, or more frequently very obtusely notched, when they may 
truly be called obcordate. 
Male Fructification (f. 5). 
Anthers (of which one or two are situated in the axilla of each perigonial leaf) ovate 
in a younger state, spherical when advanced to their full size, pale grey, reticulated ; 
footstalk about half of the length of the Anther, white, transversely striated. 
Female Fructification very generally terminal, occasionally lateral. 
Calyx (f. 9) about three-fourths of a line long, obcordate, much depressed, especially towards 
the extremity ; besides the two angles on the sides, a third and more obtuse one projects 
from the under surface, and extends from the base' to the apex, (f 6). The mouth, in 
an early state, appears to be confined to a narrow central tubular apiculus, which may at 
length be distinctly seen to divide into four acute teeth, and, after the emission of the 
capsule, a long but narrow opening is to be observed, reaching nearly the whole width of 
the calyx, (f. 9). In color and texture, I can perceive no difference between it and the 
leaves. 
Germen (f. 7) obovate, pale green, having a long tubular style. 
Calyptra of the same form with the Germen, of a very thin membranous texture, diaphanous, 
reticulated. It opens with an irregular vertical fissure for the emission of the capsule. 
Peduncle very little indeed exceeding the length of the calyx ; sometimes not at all: 
white, cellulose, cylindrical, a little thickened towards the summit. 
Capsule (f. 9) small, exactly spherical, of a delicate texture, less so indeed than that 
of J. serpyllifolia, but more so than those of J. dilatata and Tamarisci; whitish, so 
pellucid that a faint tinge of a greenish-brown color is imparted by the seeds within ; 
marked with reticulations. The four ovate valves are equal in size, and the divisions 
extend to the thickened apex of the peduncle : after the discharge of the seeds they 
become recurved. 
Seeds of an irregular form, but approaching to spherical, smooth, of a dark olive-green 
color. The spiral filaments are brown, formed of a double helix, enclosed within a 
pellucid, tubular membrane, which at the mouth is a little expanded, at the base affixed 
to the extremity of tiie inside of the valves, where they are persistent in small tufts, even 
after the discharge of the seeds. 
