540 METZGERIE2. 
cellulis internis helicem plus minus completam, vel obsoletam, in- 
cludentes. lateres monospiri, utroque fine tenues peracuti, helice 
lata plana; alii autem apicales breves, rigidi, helice incompleta 
farcti, diutius persistentes et cum nonnullis normalibus intexti in 
penicillos quatuor porrecti: omnes demum decidui. Spore minute, 
leeves vel vix asperule. 
40, ANEURA. Frondes semper fere pinnatim ramosve, carnose, costa lata 
spe a pagina haud facile distinguenda, radicellis solum hypogenis. 
Flores in ramis lateralibus. Calyptra levis vel papillosa. Capsula 
subeylindrica. Andreecia alveolata. 
41. Merzcrerra. Frondes dichotome rarissime pinnatee, tenues, costa bene 
definita, radicellis ad margines, subter costam, seepe etiam ad paginam, 
plus minus pilose. Flores in ramis hypogenis. Calyptra hirta. Cap- 
sula ovalis. Andrcecia plana. 
The plants here brought together as a subtribe have almost as much 
right to be regarded a distinct tribe, separated from Jungermaniee by the 
constantly monospirous elaters, and by the distinctly distichous arrange- 
ment not only of the male but also of the female organs, on their several 
receptacles. There is, however, no dilatation of the apex of the pedicel 
comparable to that of the Jubulee; and the elaters, although mono- 
spirous, are not permanently fixed to the capsule by one extremity and 
truncate at the other, as in Jubulew. And as to their other characters, 
nearly all are paralleled in certain of the genera grouped under the 
previous subtribe, Fossombroniew ; while the habit is often very like that 
of Symphyogyna and Pallavieinia. 
The two genera, Anewra and Metzgeria, constituting the subtribe Metz- 
geriee, are themselves separated by such marked characters that some 
authors have relegated them to distinct tribes ; while in the ‘Synopsis 
Hepaticarum’ certain species of Aneura are confounded with Metzgeria, 
for want of observing the constant character of the purely lateral rami- 
fication of Aneuwra, whereas in Metzgeria all the flowering branches are 
postical. The inflorescence and fructification are, however, so essentially 
alike in both genera that in a natural arrangement the two must always 
stand side by side. [See further my remarks under Aneura.] 
XL. ANEURA, Dumort. 
Riccardia Gray, Nat. Arr. (1821) pro parte; Anewra Dum. Comm. 
(1823); Acrostolia Ejusd. Recueil. (1835); Pseudoneura Gottsch. 
Mex. Leverm. (1863). 
Plante late depresso-ceespitosee, carnosula, raro amoene virides, 
plerumque lurido-virides-purpurascentesve, in sicco seepe nigricantes, 
Frondes vel prostrate, radicellis matrici arcte adherentes, pinna- 
tifide ramos, ramis alternis; vel e rhizomate radicelloso ramoso, 
interdum. flagellifero, ort, assurgentes, bi-tripinnats, pinnis (pri- 
mariis saltem) oppositis, apice (in sicco preecipue) pro more decurvis. 
Caulis, sive costa primaria teres vel plus minus compressa, ubique, 
