462 



JUXGERMANNIACEAE. 



1. Radula pallens (Sw.) Du- 

 mort. Pale Radula. (Fig. 509.) 

 Plants dark green, often brownish, 

 growing in loose tufts. Stems 

 loosely and irregularly pinnate, the 

 female plants often apparently 

 dichotomous on account of subfloral 

 innovations; leaves imbricated, the 

 dorsal lobe ovate-orbicular and 

 rounded at the apex, the ventral 

 lobe trapezoidal, attached to the 

 stem throughout the greater part 

 of its length, the apex inflexecT, 

 blunt; inflorescence dioecious; 

 perianth elongated, clavate, com- 

 pressed. 



On rocks, Church Cave, Har- 

 rington House, Paynter's Hill, Payn- 

 ter's Vale and Walsingham. Widely 

 distributed in tropical America, es- 

 pecially in the West Indies. 



8. COLOLEJEUNEA [Spruce] Schiffn. 



Stems prostrate, minute and delicate, irregularly branched, the branches 

 as in Hadula; rhizoids arising from the ventral surface of the stem. Leaves 

 complicate-bilobed, the dorsal lobes larger than the ventral, incubous, attached 

 by a very narrow base, convex, widely spreading, broadly ovate to lanceolate, 

 entire to erenulate or denticulate from projecting cells; lobule inflated, at- 

 tached to the lobe by a long arched keel, usually with two teeth in the apical 

 region; leaf cells uniform, often highly convex or tuberculate, usually thin- 

 walled and without trigones. Underleaves none. Antheridia borne singly or 

 in pairs in the axils of saccate bracts,, the latter in more or less elongated 

 androecia. Archegonia borne singly on more or less elongated branches, with 

 one or two subfloral innovations, the bracts with plane lobules. Perianth 

 inflated, 5-keeled, abruptly narrowed to a more or less distinct tubular beak. 

 Gemmae discoid, borne on the surface of the leaves. [Greek, clipped Lejeunea.] 

 About 100 species, mostly tropical. Type species: C. calcarea (Lib.) Schiffn. 



