JUNGERMANNIACEAE. 



461 



modified bracts, the latter in about five pairs, occupying the whole or the apex 

 of a lateral branch. Archegonia usually borne on a short ventral branch, more 

 rarely at the apex of the stem or an elongated lateral or ventral branch. 

 Bracts and bracteoles similar, deeply 3-5-parted, with a low basal membrane 

 and narrow subulate divisions. Perianth terete below, obtusely triangular 

 toward the constricted and ciliate mouth. [Greek, cobweb.] Two species, the 

 following and the typical T. chaetophylla Spruce. 



1. Telaranea nematodes 

 (Gottsche) M. A. Howe. TELA- 

 RANEA. (Fig. 508.) Plants 

 pale green, forming loose tufts 

 or creeping among other plants. 

 Leaves distant to imbricated, 

 the divisions four to eight cells 

 long, and the cells mostly twice 

 to four times as long as broad ; 

 underleaves bifid or trifid with 

 the divisions two or three cells 

 long; inflorescence autoecious. 

 [Jungermannia nematodes 

 Gottsche.] 



On moist soil, Devonshire 

 Marsh, M. A. Ho ice. Long Island 

 to Florida and Louisiana ; trop- 

 ical America and Africa. 



7. RADULA Dumort. 



Stems prostrate or growing from a prostrate rhizome, with numerous lat- 

 eral branches arising just behind normal leaves; rhizoids always borne on the 

 ventral lobes of the leaves. Leaves complicate-bilobed, the dorsal lobes larger 

 than the ventral, incubous, usually entire and often rounded at the apex ; ventral 

 lobes attached to the dorsal by a more or less elongated keel, the free margin 

 usually appressed to the dorsal lobe. Underleaves none. Antheridia borne 

 singly or in groups of two or three in the axils of saccate bracts, the latter 

 forming more or less elongated androecia. Archegonia borne on more or less 

 elongated branches, sometimes with subfloral innovations; bracts similar to the 

 leaves. Perianth usually dorsiventrally compressed, rarely subterete or plicate, 

 truncate and bilabiate but otherwise entire at the broad mouth. Gemmae, when 

 present, discoid, multicellular. [Latin, a scraper or spatula.] About 400 

 species, largely tropical. Type species: E. complanata (L.) Dumort. 



