460 



JUNGERMANNIACEAE. 



5. CAIiYPOGEIA Raddi. 



Stems prostrate, sparingly and irregularly branched, the branches almost 

 always ventral and arising in the axils of the underleaves. Leaves incubous, 

 obliquely attached, oblong or ovate, undivided or bidentate at the apex, 

 entire or nearly so. Leaf-cells mostly delicate and thin-walled. Underleaves 

 large, distant to imbricated, orbicular to reniform, rounded at the apex or 

 more or less bifid. Antheridia borne singly or in pairs in the axils of small 

 and delicate saccate bracts, variously toothed at the apex, the bracts forming 

 short ventral androecia, not proliferating. Archegonia borne on short ventral 

 branches; bracts minute and irregularly toothed at the apex; perianth none; 

 sporophyte developed within a fleshy pendent perigynium. Capsule cylindric, 

 with spirally twisted valves. Gemmae unicellular or bicellular. [Greek, earth- 

 calyx.] Species about 50, largely tropical. Type species: C. fissa (L.) Raddi. 



1. Calypogeia fissa (L.) Raddi. Cleft 

 Calypogeia. (Fig. 507.) Plants glaucous 

 green, translucent, growing in depressed 

 mats or creeping among other plants. Leaves 

 loosely imbricated, broadly ovate, mostly 

 about 1" long, the apex variable but usually 

 shortly bilobed or bidentate with rounded to 

 subacute lobes or teeth and a shallow 

 rounded sinus ; leaf -cells about 45 fi in diam- 

 eter, thin-walled and usually without tri- 

 gones; underleaves distant, broader than 

 long, deeply bifid with blunt lobes, each 

 often bearing a lobe-like tooth on the outer 

 side. [Mnium fissum L.] 



On moist soil, Devonshire Marsh, E. G. 

 Britfon. Europe ; eastern North America ; 

 perhaps Japan. Distribution incompletely 

 known. Previously listed from Bermuda as 

 Kantia Trichomanis (L.) S. F, Gray. 



6. TELARANEA Spruce. 



Plants delicate and filmy. Stems prostrate, sparingly and more or less 

 pinnately branching, the branches mostly lateral, rarely ventral, never flagelli- 

 form. Leaves almost transversely attached, divided practically to the base into 

 two or three filiform divisions, each composed of a single row of elongated and 

 thin-walled cells. Underleaves much smaller, bifid (or trifid) with short 

 incurved, filiform divisions. Antheridia borne singly in the axils of scarcely 



