(J. platyphylla.J 
BRITISH JUNGERMANNI/E. 
Muscoides squamosum, saxatile, maximum, compressum, ex obscuro virescens, foliis subro- 
tundis non nihil denticulatis. Micheli, Nov. Gen. p.9. t. 6. f. 1. 
Lichenastrum Arboris Vita: facie, foliis rotundioribus. Dill. Muse. t. 72. f. 33. 
Jungermannia, foliis imbricatis, lanceolatis, superne planis, alternis, inferne concavis, 
quinquefariis. Hale, llelv. iii. p. 61. n. 1872. var. f3. 
Hab. — a is extremely abundant upon old walls, rocks, and even on the trunks of trees, 
in various parts of the kingdom ; flourishing within the influence of the smoke of large 
towns. — 3 has hitherto been found only in Ireland, by Miss Hutchins, upon stones 
by the side of Gougan Barra Lake, among the mountains near Bantry. — y was first 
discovered in this country by Mr. Archibald Menzies, in August, 1778, growing upon 
trees on the North side of Loch Ness, in Scotland. — It has since been gathered by 
Mr. Templeton, on moist rocks, by the side of a waterfall, near Carrifergus, in Ireland. 
— (Upon a the female fructification is produced in March and April ; but some of Mr. 
Menzies' specimens of the /3, which he has been so good as to furnish me with, con- 
tain perfect capsules, gathered in August. — Mr. Lytll has detected the male fructifi- 
cation in the month of March.) 
This Plant grows in considerable patches, with every individual imbricating each other, as is 
the case with J. Hutchhisia ; or, to use the words of Dillenius, ‘ ‘ Magnis caespitibus et 
numerosa serie invicem congestis, arboribus et muris adnascitur hie muscus. 
The roots are with difficulty discoverable, a few rigid, extremely brittle, and somewhat 
ligneous fibres, may now and then be seen to descend from the lower part of the plant. 
Stems from one to two and three inches in length (or even five inches, in /3 and y), 
scarcely so thick as small packthread, very flexuose, and pinnated often with straggling 
branches, in some instances with much greater regularity than in others ; these pinnae 
are not unfrequently again divided with short and nearly horizontal simple pinnulie. 
Their texture is firm, opaque, and even woody below, but, towards the extremity, the 
cellular texture is very visible. The color varies from a deep brown to a yellow, but 
dirty green. 
Leaves closely imbricated in two rows, so as wholly to conceal the upper side of the stem; 
they are unequally two-lobed, having the upper one considerably the largest, and nearly 
three quarters of a line (in y more) in length, often largest at the extremity of the 
branches, distichous*, alternate, horizontal, ovate, approaching to round, slightly con- 
cave above, with the margins, particularly at the apex, incurved, entire, or here and 
there very slightly toothed : the lower lobe or lobulus is ligulate, diagonally appressed 
to the inferior surface of the upper one, plane, having the margins only recurved 
and entire. The color of the leaves is a deep, and sometimes blackish-green, opaque, free 
lorn gloss in a; the texture is rather compact; the cellules minute, roundish (f. H). 
* Dillenius has been very happy in his description of this species, of the leaves in particular, « foliis crebris" 
,-e his words, .mbncadm congestis, alternd serie a dext.ll ad sinistram, a sin, suit ad dextram itnpositis, tenui- 
'Z — SC “ tUr Virid ‘ bUS ’ “ “ fUSC ° ViremibUS > ai)iCibUS “ Minibus deorsum flexis, u, 
