458 



JUNGEKMANNIACEAE. 



2. CEPHALOZIA Dumort. 



Steins sparingly and irregularly branched, the branches almost always 

 ventral, sometimes flagelliform. Leaves suceubous, obliquely attached and 

 often decurrent, two-lobed. Leaf-cells large (mostly 30-50 n in diameter) and 

 transparent, mostly with thin walls. Underleaves minute or none. Antheridia 

 borne singly in the axils of more or less saccate bracts, the latter imbricated, 

 forming androecia variable in length and rarely .proliferating. Archegonia 

 usually borne on short ventral branches. Bracts and bracteoles similar, larger 

 than the leaves, variously cleft or lobed. Perianth triangular-prismatic with 



one keel ventral, the mouth constricted, crenu- 

 late to ciliate. Gemmae unicellular or bicellu- 

 lar. [Greek, twig-headed.] Species about 60, 

 mostly of temperate regions. Type species: 

 C. bicuspidata (L.) Dumort. 



1. Cephalozia connivens (Dicks.) Lindb. 

 CEPHALOZIA. (Fig. 504.) Plants pale green, 

 growing in depressed mats. Stems bounded 

 by a layer of large cells; leaves loosely ar- 

 ranged on the stem, almost longitudinally at- 

 tached, orbicular, bifid one half or less with 

 acute connivent lobes and a rounded sinus, 

 leaf-cells large, about 50 /* in diameter ; under- 

 leaves none ; inflorescence autoecious ; androe- 

 cium occupying a small ventral branch, not 

 proliferating; archegonia borne on a small 

 ventral branch; bracts deeply and irregularly 

 3-5-cleft with narrow entire acuminate lobes; 

 bracteole bifid with similar lobes, more or less 

 coalescent with the bracts; mouth of perianth 

 long-ciliate. [Jungermannia connivens Dicks.] 



On moist soil. First collected by Moseley. 

 Devonshire Marsh. Widely distributed in Europe, 

 Asia, and North America. 



3. CEPHAIiOZIELLA [Spruce] Schiffn. 



Plants very small. Stems sparingly and irregularly branched, the 

 branches ventral or lateral, never flagelliform. Leaves almost transversely 

 inserted and often somewhat channeled, two-lobed. Leaf-cells small (mostly 

 12-20 M in diameter), often with thickened and pigmented walls. Underleaves 

 sometimes present. Antheridia borne singly in the axils of the bracts, the 

 latter similar to the leaves or somewhat specialized, imbricated, forming more 

 or less distinct androecia of varying length, sometimes proliferating. Arche- 

 gonia usually borne on elongated branches, rarely on short ventral branches. 

 Bracts and bracteoles similar, larger than the leaves, more or less connate, 

 variously lobed or cleft, the divisions often dentate. Perianth prismatic with 

 from three to six angles, elongated, the mouth contracted, crenulate or dentate. 

 Gemmae unicellular or bicellular. [Diminutive of Cephalozia.] About 50 

 species, mostly of temperate regions, the following typical. 



