MICROPTERYGIUM. 383 
1. M. parvistipulum. Parum ramosa, ramis oligophyllis. F. equitantia, 
ad basin fere usque complicata ; lamina superior triplo longior quam 
lata, ovato-lanceolata oblique acuta subserrulata, facie aspera; 1. 
inferior duplo angustior, lanceolata; ala laminz inferiori similis 
eequilonga, minus lata; cellule preminute, in conum truncatum 
asperulum prominule. F!* foliis 10plo breviora, cuneato-rotunda, 
apice 3—4-dentata integerrimave. -Perianthia trigona albida, ore 
longiciliata. 
2. M. Pterigophyllum. Vage ramosa, ramis polyphyllis. F. vix imbri- 
cata, ad basin fere usque complicata, serrulata, aspera ; 1. sup. duplo 
longior quam lata, sublingulata acutata ; 1. inf. vix duplo angustior, 
acuminata ; ala angustiuscula, longe supra folii basin desinens ; c¢. 
minutulz prominule et asperule. F'* foliis plus duplo breviora, 
suborbiculata serrulata, apice argute 3-dentata. Per. superne alte 
3-carinata, ore longissime ciliata. 
3. M. angustistipulum. Laxe pinnata, pinnis longiusculis. F. equi- 
tantia repanda asperula ; 1. sup. subduplo longior quam lata, ovato- 
oblonga, truncato-obtusata ; 1. inf. superiore plus duplo angustior, 
paulo brevior; ala lamin inferiori subequilata; ¢. praeminute 
prominulz asperule. F!* foliis vix duplo breviora, angusta, ovato- 
lanceolata, apice spinoso-2—4-dentata, raro integra. 
4, M. leiophyllum. lLaxe pinnata, pinnis pro m. brevibus. F. subequi- 
tantia subleevissima, apice truncato pauciserrata, ovato-oblonga, 
solum in dimidio supero complicata ; 1. inferior alaque 1. superiore 
plus triplo angustiores ; ¢. parvee planiusculz pellucide. F'* foliis 
duplo breviora, ligulato-oblonga, apice 3—-4-spinulosa. Per. omnium 
maxima, linearia, obtuse trigona, ore longiuscule ciliata. 
1. MICROPTERYGIUM PARVISTIPULUM, Spruce. 
Hab. in truncis prostratis cariosis ubique sylvarum ad fluv. Negro et 
Uaupés ripas, in nemore arenoso Umirisdl dicto prope Manaos 
preecipue, frequens. 
F. lam, sup “75 x ‘25, inf 7 x 15, ala 1™™ lata, c ,; f'* 07 x 08; bractez 
1°35 x ‘4-5 ; per 3:0 x 0°5, caps 1°0 x *B5™™. 
Pallide viridis, late czespitoso-procumbens. Caules 2™ longi, basi sub- 
aphylli radicellosi, dein arcuantes, folia distantia parva ovata 
acuminata alato-carinata gerentes. Rami laterales pauci, 3™™ longi, 
suberecti, plumeeformi-arcuati, ambitu. (cum foliis sub 15-jugis) 
lineari-lanceolati ; postici perpauci flagellares. 
Folia equitanti-imbricata planiuscula, leniter decurvula, angulo axillari 
sub 70° patentia; lamella superior oblique ovato-lanceolata, triplo 
longior quam lata, oblique acuta, basi semicordata, margine distanter 
serrulata necnon cellulis prominulis valde crenulata erosulaque, 
faciebus asperrima ; 1. inferior basi vix brevior, apice cum superiore 
contermina, lanceolata acutata, basi rotundata; ala lamelle inf. 
equilonga, angustior tamen; cellule preminute pachydermes 
angulato-rotundee-oblongeeve, in conum truncatum asperulum alte 
prominulz, carinam versus majores rectangulares. 
Foliola preeminuta, foliis 10plo breviora, caulivix zequilata, cuneato-rotunda, 
apice irregulariter 3-4-dentata raro subintegerrima, pro m. arhiza. 
Flores dioici: ramulus ? e caulis facie inferiore ortus, brevissimus, basi 
radicellis villosus. Bracteze 6, biseriate, appressee, 3 exteriores 
minute, interiores foliis duplo fere longiores, anguste ovato-oblonge, 
