HEPATICAE 423 



566. PLAGIOCIHXA, Nees # Mont. 



[Gr. Playios, turned to one side, and Chtios, herbage; descriptive of the plant.] 

 Fructification terminal or lateral. Involucral leaves 2, larger than 

 the cauline. Perianth compressed at right angles to the plane of 

 the stem ; the mouth truncate, entire or ciliate-toothed. Pistillidia 

 numerous. Calyptra membranaceous. Antheridia covered by small 

 and ventricose-imbricated perigonial leaves. Stem-leaves succubous, 

 with the dorsal margin decurrent and reflexed, often turned to one 

 side. 



f Amphigastria none; orifice of the perianth cUMe-toothed. 



1. 1*. isplen ioidcs, N. $ M. [Asplenium-like'} : Leaves some- 

 what imbricated, oblique, spreading, rounded-obovate, entire or 

 denticulate ; perianth terminal. Banks of rivulets. 



ft Amphigastria fugacious, 2- to 3-deft. 



J. P. porelloides, Lindenberg. \_Porella-like'\ : Stems divided ; 

 the branches ascending ; leaves rather imbricated, convex-gibbous, 

 rounded-obovate, those at and near the summit of the stem repand- 

 denticulate, the others entire; perianth oblong, the mouth denticu- 

 late. Among moss, at the base of trees. 



56?. SCAPAflTIA, Lindenberg. 

 [Gr. Skapane, a shovel ; from the shape of the leaf-lobes] 

 Fructification terminal. Involucral leaves 2, larger than the cauline. 

 Perianth compressed, parallel to the plane of the stem, the mouth 

 entire, or ciliate-toothed. Pistillidia few. Calyptra membranaceous. 

 Antheridia in the angles of small saccate equally 2-lobed perigonial 

 leaves. Stem-leaves succubous, complicate- 2-lobed, the dorsal lobe 

 smaller. Amphigastria none. 



1. S. neniori>sa, Nees. [Grove"] : Stems ascending, crowded ; 

 leaves ciliate-toothed, each lobe convex, obtuse ; the ventral obovate, 

 oblique, twice as large as the other. Moist banks. Variable. 



568. JUNGERIttAHWIA, L. Scale-Moss. 



[Dedicated to Ludurig Jungermann ; a German Botanist.] 

 Fructification terminal. Involucral leaves free, like or unlike the 

 stem-leaves. Perianth membranaceous, tubular, plicate-denticulate 

 at apex, the mouth 3- to 6-cleft. Calyptra included, rarely pro- 

 jecting. Antheridia in the base of inflated perigonial leaves. 

 Stem-leaves succubous. Amphigastria present, or absent. 



f Leaves 2-cleft ; amphigastria none. 



1. J. COnniven, Dickson. [Connivent]: Stems creeping, flex- 

 uose ; leaves nearly orbicular, with a broad decurrent base, distant, 

 a little wider than the stem, 2-cleft to | or of their length, the 

 sinus obtuse ; segments acute, connivent ; reticulations large ; in- 

 volucral leaves 3- to 5-cleft ; perianth slender, the mouth lacerate- 

 ciliate. On rotten wood. 



