BRITISH JUNGERMANNIiE. 
( J . complanata.) 
the presence, and has given a particular description of them : his words on the subject are, 
“ Quamvis Pollich, Scopoli, et Weber stipularum praesentiam negent, tamen revera adsunt, at segrius 
et caule luci obverso sub lente bene augente rith tanttim distinguendae. Ad latera scilicet caulis 
nervi intra folia densissimb imbricata egrediuntur in averse paging foliisque adprimuntur, structura 
et figura cum illis exaetb convenientes, licet duplo minores from all which, it appears that he has 
taken the smaller lobe of the leaf for stipules. 
The circumstance of roots proceeding from the leaves is highly curious, and Wahlenberg, 
I believe, was the first to observe it. We know that the leaves of some mosses ( Hookera 
lucens for example) have the property of throwing out roots, but in them it takes place at the 
margin of the leaves ; here from the surface or pagina, and generally from that part which forms 
the fold between the smaller and the larger lobe. I have reason to think that J. dilatata and 
J. Tamarisci possess the same property, and that the small spherules I have figured on the stems 
and leaves of the former of these species (tab. 5), are the young roots ; and the more so, since I 
have seen the following remark of Wahlenberg. Alluding to the leaves of J. complanata, he says, 
“In ejus pagina inferiore versus oram inferiorem papilla protuberat, primum viridis, dein fuscescens 
et radicans.” 
Nor are the Gemmae less worthy of observation. They have the most complete analogy with 
the Gemmae of the Marchanlia, and with those of J. f areata ; being, like them, evidently cellular j 
and they are seen to increase in size before they are detached from the plant. Totally different are 
they in their nature from the Gemmae of J. bicuspidata, J. ventricosa, &c. 
In point of calyces, J. complanata resembles J. undulata, which, notwithstanding the different 
mode of growth and habit, as it appears at first sight, ought, perhaps, to rank in the same family 
with that species. There is this striking difference between them, that, in the family in question, 
the lobules cover the upper or anterior surface of the stem, in J. complanata the lower. Such is 
the case, too, in J. cochleariformis, where the lobule is, however, formed into a kind of sack. 
