Pterygophyllum. 3 



Caulis prostratus, ramis ascendentibus , basi et ad ramorutn basiti subtile radiculosas, succu- 

 lentus, viridis, fragilis. 



Folia a caulis et ramoruin basi ascendendo majores, laxe imbricata, hyalino-viridia , nitentia, 

 inferiora rotundato-ovalia (3), superiora ovata (4, 5, 6), utraque e basi concava deplanata, margine 

 leniter incurva, ureulis magiiitudine inaequali, rotundato- ovali- rhombeo- hexagonis (6 a), hyalinis, 

 granulationibus chlorophyllosis minutis. 



Flores monoici; mascuii femineis intermixti, parvuli, hexaphylli (7 6), foliis perigonialibus te- 

 nuissiinis (8), antheridiis brevibus, paraphysibus 2 — 3-articulatis, longioribus, cellula ultima clavato- 

 incrassata (9) ; arcbegonia pauca, minuta, paraphysibus duabus vel tribus. 



Fructm in caule et ramis caulescentibus (1,2, 1 b). Ramulus perichaetialis brevis, crassius- 

 culus, basi radiculis pallidis radiculosus (13). Perichaetium parvulum , hexaphyllum, foliis minutis, 

 lauceolatis (11, 12), internis caeteris minoribus, partim rudimentariis (10). Vaginula propria nulla 

 (13). Caiyptra albida (14). Capsula in pedicello unciali crasso purpureo siccitate leniter ad dex- 

 tram torto (16) horizontalis, nutans, ovalis, solide coriacea, spadicea, aetate atro-brunnea, sicca 

 evacuata laevis, sub ore paulum coarctata (16). Ânnulus e duplici cellularum série (19 a). Peri- 

 stomii externi dentés humidi conice conniventes (17), sicci apice incurvi, longe lanceolati, angustis- 

 sime trabeculati, trabeculis ad margiuem prorainulis (19), solidi, rufo-purpurei, apice pallescentes; 

 interni processus dentés longitudine aequantes, in carina lacunes! , solidiusculi , ut membrana basi- 

 laris aurantiaci (18). Sporae minimae, virides. 



