386 MICROPTERYGIUM. 
serrulatis, foliorum ala duplo angustiore basi longe breviore, foliolis paulo 
brevioribus suborbiculatis (nec lanceolatis). 
4, MIcROPTERYGIUM LEIOPHYLLUM, Spruce, 
Hab. per planitiem Amazonicam valde frequens, in sylvis primevis 
umbrosis ad saxa et arborum truncos tam vivos quam prostratos et 
putrescentes ; locis (Brasiliw) Caripi, Mandos, Taruma, S. Gabriel, 
fl. Uaupés, &c.; (Venezuele) Cocti, S. Carlos, &e. In Andibus 
orientalibus rarior est et vix supra 900™ ascendit. 
F'°85 x -43, lamina inf. "4x °25; fl" 4x 183 ¢ 3p 5 br. nt 15x °555 per 
4:5 x°*75; caps ‘75x °3™™, 
Pallide viridis pellucida, in plagas latas laxiusculas extensa. Caules 
3-4 ™ longi, validi, 8 cell. diametro, 20 cell. circiter circumferentia, 
arcuato-reptantes, intricati, basi subaphylli et flagelliferi, dein dis- 
tanter parvifolii laxepinnatim ramosi. Rami distantes, laterales 
simplices erecti, apice decurvi (in sicco circinati) oligo-(raro_poly-) 
phylli; postici pauciores, plerumque flagellares rufescentes flexuosi 
parce radicellosi, alii autem foliosi iterum ramulosi. 
Folia subimbricata decurvulo-secunda sublevissima, oblique ovato- 
oblonga, apice subrecte-rotundatove-truncato pauciserrato-dentata 
(dentibus 4-7), ceetero margine repandula integerrima, dimidio 
inferiore subplana vel caviuscula, superiore laxe et valde ineequaliter 
complieata; lamina postica folio duplo brevior, plus triplo angustior, 
semilanceolata, apicem versus 2-3-denticulata; ala laminz subcon- 
formis, integerrima; cellule parvee (pro genere majusculz) pellucide, 
subpachydermes, planiuscule, subrhombe, carinam versus longiores 
et rectangulares vel subhexagonze, endochromio parco. 
Foliola foliis duplo breviora, contigua, erecta, subconcava, ligulato- 
oblonga, apice 3—4-spinulosa, raro radicellifera. 
Flores dioici: 9 rari, in ramo brevissimo postico terminales. Bractese 
9, tristichee, appressee ; exteriores minutissime ; intima foliis 3plo 
fere longior, ligulato-oblonga, apice profunde inciso-ciliata, ciliis 
sub 4 latiusculis flexuosis subciliolatis, caetero margine subciliolata ; 
bractese duse proxime sequentes sensim minores, latiores, minus 
incisee: omnes tenues pellucidee obtuse carmatze. 
Perianthia maxima, bracteis triplo longiora, linearia obtuse trigona 
incurva levissima, apice subconstricto in cilia longiuscula torta 
soluta; cellulee anguste rectangulares. Calyptra plus duplo brevior, 
tenuis. Capsula elongato-oblonga bistrata; cellule strati exterioris 
oblongo-quadratie, pariete trabeculato, interiores fibris semiannulari- 
bus intus fulcite. Elateres longi, laxe dispiri, folliculo tenuissimo. 
Spore minute, diametro elateribus subminores, leves. 
Andrwcia tenuispica, varie posita, plerumque ramulum posticum totum, 
vcl ejus apicem solum tenentia, rarius in ramis lateralibus terminalia. 
Bracteze ad 10-jugee, parvee tenerrimee conferte: assurgenti-secundee 
orbiculatee concavissime eroso-denticulate, inferiores mutica, supe- 
riores acuminate. Antheridia solitaria globosa, in stipite equilongo. 
Bracteolee longitudine bractearum, lanceolate, utroque fine acu- 
minatie. 
Ad S. Gubriel fluvii Negro, in sylvis humilioribus ad arborum radices, 
advenit forma luxurians, densa, seepe bipinnata ; ramiis foliisque planioribus, 
his magis serrvatis, dentibus ad dimidium folium fere descendentibus ; 
