JUNGERMANNIACEAE. 517 



to almost black, not glossy. Leaves complicate-bilobecl, the dorsal lobe squar- 

 rose when moist, ligulate to ovate, entire or nearly so, the apex rounded to 

 subacute, not reflexed; lobule normally inflated along the keel, the margin 

 plane or involute, the apex represented by a more or less distinct tooth with a 

 hyaline papilla at its proximal base; lobule often poorly developed, leaf -cells 

 with distinct trigones. Underleaves more or less convex and often revolute 

 along the sides, orbicular to obovate, undivided but sometimes retuse, entire. 

 Antheridia borne singly in the axils of saccate bracts, the androecia long, 

 sometimes proliferating; braeteoles everywhere present. Female inflorescence 

 borne on an elongated branch, usually with but one subfloral innovation; bracts 

 unequally complicate-bilobed, without wings; bracteole similar to the under- 

 leaves. Perianth with sharp lateral keels and a single sharp ventral keel, 

 usually wingless. [Greek, whip-bearing Lejeunea.] About 50 species, mostly 

 tropical. Type species: M. auriculata (Wils. & Hook.) Schiffn. 



1. Mastigolejeunea auriculata (Wils. & Hook.) Schiffn. in E. & P. Xat. Pflf. 

 P: 129. 1894. 



Jungermannia auriculata Wils. «& Hook.; Drummond, Muse. Amer. St. 

 Merid. 170. 1841. 



Glaucous green, varying to purplish black, growing in depressed tufts. 

 Dorsal lobes of leaves appressed when dry, squarrose when moist, about 1 mm. 

 long, rounded to subacute; leaf cells averaging about 21 X 12ju; underleaves 

 broadly orbicular, truncate to retuse, usually cuneate at the base; inflorescence 

 autoecious or dioecious; perianth oval, the keels not winged. 



On bark and rocks, Andros and New Providence : — Florida to Louisiana ; widely 

 distributed in tropical America. Eaeed Mastigolejeunea. ^ 



17. ARCHILEJEUNEA [Spruce] Schiffn. in E. & P. Xat. 

 Pflf. P: 130. 1894. 



Plants medium-sized to large, usually reddish or brownish, consisting of a 

 prostrate caudex and secondary, often branched, stems, free from the sub- 

 stratum, the branches as in Badula. Leaves imbricated, complicate-bilobed, 

 the dorsal lobes not squarrose when moist, suborbicular to ligulate, rounded and 

 entire; lobule inflated along the keel, the margin more or less appressed to the 

 lobe, entire except for the sharp apical tooth, with a hyaline papilla near the 

 proximal base; lobules often imperfectly developed on the secondary stems; 

 leaf-cells with distinct trigones. Underleaves orbicular to reniform, undivided, 

 entire. Antheridia borne in pairs in the axils of saccate bracts, the androecia 

 long but often proliferating; braeteoles everywhere present. Female inflores- 

 cence borne on a secondary stem or one of its branches, with one or (more 

 rarely) two subfloral innovations, the innovations often floriferous, thus giving 

 rise to cymose clusters; bracts unequally complicate-bilobed but not winged, 

 the lobes entire, narrower and often more sharply pointed than the leaves ; 

 bracteole sometimes bidentate or retuse. Perianth oblong to obovate, more or 

 less compressed, dorsal surface with one and ventral surface with two keels, 

 the keels with narrow and interrupted wings. [Greek, chief Lejeunea.'] About 

 70 species, mostly tropical. Type species: A. porelloides (Spruce) Schiffn. 



