Thamnium. 5 



Planlae plus minus elatae, haud i-aro sesquipedales , erectae vel apice incurvae, sola basi 

 repente inter se cohaerentes^ e basi rarius e parte ramosa stoloniferae; caules dendroidei post primain 

 fructißcationem procumbentes ac sensim putredine dissoluti (Fig;. 1)'2). 



Folia, exceptis rhizomatis atque caulis erecti basilaribus quae remota sunt, minima atque, scariosa 

 evadunt, conferta, erecto-patentia (4, 5) obiongo- et late ovato-Ianceolata, plano-concava, mnrgine 

 piano, minutissime serrato, apice grosse dentato, Costa sub apice evanida (6—!)) compressa, superiore 

 parte dorso siibhispida (!)x'), areolatione minuta basi lineali-oblonga, caeterum brevi-rhombea et 

 subquadrata (9 a, 9 b), colore viridi, nitore vix ullo. 



Florescentia dioica. Planta mascula t'eminea minor et minus ramosa (3) ; flores numerosi gem- 

 tnulas graciles sistentes (5, 10); folia perigonialia late et oblongo-lanceolata, ecostata, antheridia 

 oblonga, pauca, paraphysata CH)- 



Fructus in caulis erecti parte ramosa vel in ejusdem divisionibus, nunquam in ramulis, gregarii 

 rarius solitarii. Ramulus perichaetialis brevis arrhizon. Perichaetium laxe vaginans; folia perichae- 

 tialia caulinis pallidiora, externa minima ovata, mutica (12), media late lanceolata, concava supra 

 medium patnla (!•'>)) intima oblonga, in apiculum lineali-lanceolatum patulum producta (14), omnia 

 «costata, apice denticulata. Calyptra angusta, vix ad mediam capsulam producta, longirostra, stra- 

 minea (15). Capsula in pedicello semiunciali rarius unciali, cygneo, rubello obliqua vel horizontalis 

 ovalis et ovali-oblonga, symmetrica (15, 16), solida, brunnea, deoperculata sicca sub orificio leviter 

 constricta, caeterum laevis (17), aetate atro-fusca. Operculum e basi late conica longirostrum, 

 rostrum obliquum subulatum. Ânnulus e duplici cellularum série (17, 18). Peristomium magnum, 

 supra capsulae orificium oriens; dentés usque ad medium lineales, dehinc subulati (18), crassiusculi 

 (19), pallide aurantiaci, hyalino-marginati, margine ad apîcem subulatum eroso; interni processus in 

 carina pertusi, cilla ternata ad articulationes appendiculata (17). 



