HEPATICAE 427 



erect, incurved. Elaters free, attenuated at both ends. Spores 

 large, rather angular. Dioicous. Antheridia in the saccate base of 

 closely imbricated 2-lobed perigonial leaves. Stem-leaves bifarious, 

 incubous, deeply and unequally 2-lobed. Amphigastria large, decur- 

 rent. 



1. M. platypliyl'la, Dum. [Broad-leaved] : Stems irregularly 

 bipinnate ; dorsal lobe of the leaf roundish-ovate, the basal margin 

 more or less undulate; ventral lobe smaller, oblique, cordate-oval, 

 the margins reflexed ; amphigastria round-obovate ; mouth of the 

 perianth nearly entire. On trees, and rocks. Variable. 



2. M. Porella, Nees. [Little pore] : Stems 2 to 3 inches long, 

 bi- tri-pinnate, the forked branches divergent; leaves distant; 

 dorsal lobe oblong-ovate, obtuse, the ventral much smaller, ap- 

 pressed to the stem, oblong, flat ; amphigastria quadrate ; mouth of 

 the perianth crenulate. Stones, and roots of trees subject to in- 

 undation. 



579. FRUM-AUTIA, Raddi. 



[Said to be a personal name.] 



Fructification terminal on proper branches. Involucral leaves 2 or 4, 

 2-lobed, not auriculate. Perianth oval, or obovate, terete, or 3- or 

 4-angled, mucronate at apex by a tubular mouth. Pistillidia 2 or 4. 

 Calyptra pear-shaped, persistent, with a style, rupturing below the 

 apex. Capsule pedicellate, globular, 4-cleft halfway down, the 

 valves erect-spreading. Elaters truncate at both ends, with one 

 spiral fibre, adherent to the valves, erect. Spores large, irregular, 

 minutely muricate. Dioicous. Antheridia in the saccate base of 

 closely imbricated 2-lobed perigonial leaves. Stem-leaves bifarious, 

 incubous, 2-lobed, the lower lobe usually an inflated helmet-shaped 

 appendage (auricle). Amphigastria entire, or 2-toothed, throwing 

 out rootlets from their base. 



1. F. Cilrayaiia, Mont. [Gray's"]: Stems creeping, simply 

 pinnate ; leaves glossy, deep purplish-brown, nearly orbicular, 

 concave ; auricle oblong-clavate ; amphigastria oblong ; perianth 

 3-sided, obtusely keeled beneath. On trees, and rocks. 



2. F, Tirgillica, Lehm. [ Virginian] : Stems creeping, vaguely 

 branched ; leaves green, nearly ovate, entire, concave ; auricle 

 sometimes expanded into a lanceolate lamina ; amphigastria round- 

 ovate ; perianth compressed, tuberculate, 4-keeled beneath, 2- 4- 

 keeled on the back, the keels crested. Rocks and trees. 



3. F. Eboraceiisls, Lehm. [York] : Stems creeping, fascic- 

 ulately branched; leaves roundish-ovate, the cauline loose, the 

 rameal imbricated ; amphigastria ovate ; perianth smooth, slightly 

 compressed and repaud, obtusely keeled beneath, and gibbous near 

 the apex. On trees. 



4. F, aeolotis, Nen. [Various- auricled]: Stems procumbent, 

 vaguely or pinnately branched; leaves half vertical, spreading, 

 obliquely cordate-ovate ; auricle usually an ovate-lanceolate lamina ; 

 amphigastria ovate or obovate ; ventral lobe of the involucral leaf 

 incised. Trees. Allied to the preceding. 



