180 TRACHY-LEJEUNEA. 
Suscenus XXI.—TRACHY-LEJEUNEA, 8. 
Plant robustiuscule, raro pusille, albicantes, siccando sepe fuscescentes, 
pro more dense stratificatee, in vivo semper aqua replete, post sicca- 
tionem haud facile emolliende. 
Caules prostrati pinnati bipinnative, valde tenaces, interdum purpurei 
sanguineive; rami ineequilongi, seepe assurgentes dein apice attenuato 
decurvi. 
Folia imbricata, plerumque pellucida, decurvo-fornicata longiora quam 
lata, seepius subacuta obtusave, rarius rotundata v. subacuminata, 
nonnunq. in eadem stirpe varia, margine e cellulis prominulis crenu- 
lata serrulatave, in unica sp. apice spinosa, facie raro sublevia, pler- 
umque asperula, in paucis muricato-asperrima, basin versus recte vel 
sinuato-complicata ; lobulus sub 4-plo brevior, raro subobsoletus; 
cellule in plurimis mediocres (;—3™™ diam.), in paucis parve— 
subbasales seepe duplo majores ocellum sistentes—pro more obtuse, 
rarius acute, in 7. L. papillata subulato-prominule, pariete plus 
minus incrassato, chlorophyllo haud copioso. 
Foliola subrotunda in pluribus parva minutave, foliis 3-7-plo minora, 
in paucis $ folium subequantia, integerrima vel rarius spinulosa— 
in unica foliis imo majora spinosaque—in omnibus levissima, ad 4-3} 
(raro ultra) bifida, segmentis acutis. Radicellee patentes valide apice 
nodoso-ramose. 
Flores in omnibus—T7. L. acanthina excepta—monoici. Fl. 2 ramo bre- 
vissimo constantes, innovatione in plurimis nulla, in perpaucis brevi 
simplice suffulti. Bracteze folis longiores, angustee, lobulatie, seepe 
faleatee hamateeque, plerumque muricato-serrulate denticulate- 
que—raro spinulosee; bracteola libera lineari-cuneata v. ovalis—raro 
orbiculata—rima angusta ad 4—} (raro ultra) bifida, interdum integra, 
seepe denticulata, in L. acanthina argute subduplo-spinosa. 
Perianthia (nonnunq.-rufula vy. etiam sanguinea) seepe angusta, clavato- 
pyriformia rotnndato-truncata rostellata, plus minus compressa 5-cari- 
nata, carinis tenuibus tuberculosis papillosis v. muriculatis, interdum 
subalatis, in paucis sp. tota facie exasperata; in 7. L. acanthina 
autem fere rotunda sublaevissima. 
Amenta ¢ ramulum brevem cauligenum, rarius rami longioris apicem 
solum tenentia; bracteze 38-6 juge parvee diandree, 
Cheilo-Lejeunea differt precipue cellulis chlorophyllosis subopacis, 
minus et nunquam acute prominulis; foliis semper rotundatis; bracteis 
integerrimis ; perianthiis compressis incurvis, demum bilabiatis, carina 
antica subnulla, posticis seepe humillimis, nunquam exasperatis. 
Harpa-Lejeunea distincta est minutie, caule breviore tenuiore minus 
pinnato, ramis 2 constanter innovatis; foliis perseepe acuminatis, lobulo 
majusculo, cellulis duplo minoribus; bracteis rarissime denticulatis; peri- 
anthiis interdum ad carinas spinoso-alatis. 
Hab. In truncis prostratis putrescentibus, in saxis vel in ipsa terra 
quartzosa, raro in cortice vivo vel in filicibus ; in planitierum sylvis 
humidis vulgate, in montibus rarissimee. 
Distr. In sylva Amazonica, ad il. Negro, Uaupés et Casiquiari praecipne, 
valde frequentes conspicuzeque, paucis speciebus autem constantes; unica 
species in Andibus Peruvianis, alt. circiter 1000™ viget. Ipse 6 species 
legi, omnes (ut videtur) novas. Ceeterze species eidem subgeneri refer- 
