( J. incisa.J 
BRITISH J UNGERM ANNIiE. 
The pericluetial leaves (f. 7) are trifid or quadrifid, the segments more equal in size 
than those of the cauline leaves, and more frequently and regularly denticulate. 
Male Fructification I have never seen. 
Female Fructification terminal upon the stems. 
Calyx (f. 8) obovate, about half a line long, and plicate : towards the extremity the 
mouth is contracted, small and toothed or lacerated. In color and texture it exactly 
resembles the leaves. 
Calyplra obovate, whitish, reticulated, terminated by a short tubular style. 
Peduncle scarcely measuring twice the length of the calyx, white and cellulose. 
Capsule, seeds, and spiral filaments exactly as in J. excisa. 
Obs. Upon the terminal leaves of this Jungermannia, towards the latter end of December, 
are situated Gemma, (f. f. 10. 11. 12. 13), collected together in a small, pale, yellowish-green, 
spherical mass ; but in the middle of January they are, for the most part, dispersed about 
tlve plant in the form of a minute powder. Each particle is semi-transparent, and under a 
microscope appears somewhat spherical in its outline, but beset with a number of acute, 
projecting angles (f. 13). 
Haller is the first author who seems to have noticed this species, to which the name of 
incisa was applied by Schrader in his Systematische Sammlung Kryptogamischer Gewdchse in 
the year 1796. In the British dominions it has for many years been known to Mr. Francis 
as an inhabitant of heathy places in the neighborhood of Holt ; and this gentleman has long 
preserved among his manuscripts a figure and description of it, under the appellation of 
J. depressu. Subsequent to its discovery by Mr. Francis it has been ascertained to be also a native 
of Ireland and Yorkshire, and during the last summer, 1811, when the engraving of the plate 
was completed, ripe capsules were brought to me by Mr. Dickson, which he had been fortunate 
enough to find near Croydon, in Surrey. Jungermannia excisa, as has been already remarked, 
bears the greatest affinity with the present plant, but the undulated and almost universally 
tridentate leaves, together with the compressed stem, are circumstances which will readily 
distinguish J. incisa from that, as well as from every other species of the genus. 
Dr. Roth’s description of J. incisa accords so well with our British plant that I feel no 
hesitation in adopting his synonym ; but he appears to have fallen into a strange mistake, 
when he says, “ Huic (J. incisa J proximo accedit, nisi eadem sit, ‘Jungermannia bicrenata 
fronde simplicity pinnatA, foliolis bidentatis ; floralibus plieatis.’ Schmidel, Icon, et Analys. 
tab. 64. J. 1 . Habitus totius plant a; sane idem cum nostra, quamvis folia constanter bisecta 
dicantur, quae in nos trie regionis plantis nunc bi nunc et plerumque trifida observantur ! ” 
In another place the same author expresses a doubt whether J. incisa be really distinct from 
liis J. globulifera, a species, which, as has been observed elsewhere, appears to me to include 
J. excisa, J. ventricosa , and J. cxsecta . 
