KEY TO THE GENERA AND SPECIES OF BRITISH HEPATIC-E 



163 



HARPANTHUS. 



/Laxly tufted or creeping among mosses; leaves horizontal, sinus 



1 broad, shallow, ^^~l deep Flotowianus 



I Densely tutted, leaves more concave, nearly erect, sinus deeper, |-1 

 ( scutatus 



MYLIA. 



( Papillae present on cells of upper leaves, which are rotiindaie... Taylor i 

 (No papillae on cells of upper leaves, which are usu. ovate ...anomala 



PLAGIOCHILA. 



. J Ant. margin of leaf much decurrent 2 



(Ant. margin little or not decurrent 3 



2 j Leaves ciliate-dentate, dentate or occ. entire ; per. ohlon^. .asplenioides 

 (Leaves spinons-toothed ; per. broadly obovate spinulosa 



., j Post, margin of leaf with several teeth 4 



(Post, margin entire or rarely with a single tooth ; plant small 5 



J j Teeth of leaves blunt ; leaves ovate-oval amhagiosa 



(Teeth spinous; leaves roundish-oval .punctata 



- j Leaves nearly horizontal, emarginate Stahleri 



\ Leaves obliquely inserted, bilobed 6 



^ (Stips. numerous, subulate, persistent exigua 



\ Stips. none, or few and minute 7 



[Leaves firm, indigo-green, nearly black when dry ; occ. a small tooth 



„ I near centre of post, margin tridenticidata 



Leaves usu. rather tender, green or light brown, not becoming nearly 

 1 black when dry .jmnctata 



JUNGERMANIA. 



-. J Leaves entire 2 



( Leaves lobed 8 



2 ] Stem with stipules 3 



( Stem without stipules 4 



/ Leaves frequently notched, bracts entire, per. ovate to ovate-oblong, 

 I not twice longer than the bracts ; on shady rocks and stones 



3 \ siibapicalis 

 j Leaves entire, bracts emarginate, lobed or toothed ; per. cylindrical, 

 I much longer than the bracts ; on wet moors aiitwmnalis 



, ] Leaves round ; per. 4-angled above sjphcerocarpa 



(Leaves longer than broad; per. not 4-angled o 



f Leaves broadly cordate with narrow attachment, embracing the erect 



o- nearly rootless stem, leaves soft cordifolia 



(Leaves ovate or parabolic ; stem creeping, with many rootlets 6 



(Paroicous; per. m. or 1. lanceolate, apex narrow, acute .inmiila 



6^Dioicous; per. oblong-ovate or pyriform, more plicate, apex trun- 

 i cate 7 



„ j Per. oblong-ovate; plant small, blackish green atrovirens 



\ Per. pyriform ; plant usu. larger, paler green riparia 



Q j Lobes of middle stem leaves 2 9 



(Lobes of middle stem leaves more than 2 24 



Q j Leaves complicato-bilobed 10 



I Leaves not complicato-bilobed 15 



^PjJAnt. lobe almost reduced to a tooth exsecta 



(Ant. lobe equal or nearly equal to post, lobe 11 



