620 Proceedings of tJie Royal Irish Academy. 



Germ. p. 275 (1834). Pleiirozia, Dum. Eecueil, 1, p. 15 (1835). 

 Physiotium, JSTees, Nat. Eur. Leberm. 3, pp. 6 et 75 (1838). 



Involucral bracts deeply bilobecl. Colesule cylindrical, much exserted, 

 mouth denticulate, teeth slightly decurved at apex. 



Pleurozia cocldeariformis, Dumortier. Stems long, varying from 

 1 to 5-6 inches, ascending. Leaves closely imbricated, unequally 

 2-lobed, upper lobe larger, concave, bifid, and serrated at the 

 apex, lower lobe pouch-like, and much smaller, colour dark 

 brown, inclining to purple. 



Jungermannia cochleariformis, Weiss, PI. Crypt, p. 123 ; Hook. Brit. 

 Junger. tab. 68. Pleurozia cochleariformis, Dumort. Pev. Jung, 

 p. 15 ; Hepat. Europ. p. 52. Physiotium cochleariformis, Nees, 

 Europ. Leberm. 3, p. 79 ; G. L. et N. Synop. Hepat. p. 235. 



Hab. On wet bogs and moors. This is probably the most beautiful 

 to the unaided eye among all the British or Irish species. Where 

 it grows freely on wide-spread moors, or in damp situations in the 

 more mountainous parts of the country, the pretty purplish stems 

 can be detected at a considerable distance from the spot where 

 they grow. It ranges from the northern to the southern counties, 

 and from the eastern to the western, and is especially abundant 

 in the latter. 



h. HOMOGAM^. 



" Stem irregularly branched, Avith branches from the amphigastrial 

 axil, or with innovations more or less approximate to the colesule, 

 rarely dichotomous, pinnate or bipinnate. Leaves succubous or 

 incubous, sometimes opposite or connate, rarely conduplicate and 

 then almost always the front lobe is smaller, so as to form very 

 variable, round or reniform to sublinear, quite entire to broken 

 up in filiform segments. Amphigastria narrow, more or less ovate- 

 lanceolate, rarely round, quite entire to broken up into filiform 

 segments, sometimes wanting. Gamoecium dioecious, paroecious, 

 more rarely autoecious. Pericha)tium proceeding from the amphi- 

 gastrial axilla as proper branches, either apical on the stem and 

 its innovations, or in many frondose forms placed on the inner 

 face, more or less below the apex of the stem, sometimes saccate 

 and dependent from the stem. Colesule usually large, from 3-5 

 plicate, very rarely winged, sometimes complanate or compressed, 

 occasionally round or densely plicate, very rarely winged, with 

 the mouth more or less wide, hardly ever beak-shaped. Seta long 

 or very long, sometimes thickish. Capsule large, globose-cylindric, 

 of thick texture, brown and not pellucid, as if formed of at least 

 two strata, valves cleft to the base, patent or divaricate, for the 

 most part shewing spiral fibres internally. Elaterstwo-, rarely one-, 

 tri-, or quadri- spiral, adhering to the inner face of capsule, very 

 rarely to apex of valves, or free. Spores minute or rather large, 

 sometimes appendiculate externally. Andrcecia proceeding from 



