— 286 — a 
aut marginales, nudi aut involucrati. Sporangia transverse 
AN A O ES PENA IV. POLYPODIACEAR, 
2. orangiorum annulus horizontalis, apicalis y. subapicalis; 
indusium nullum y. spurium. : 
a. Annulus incompletus, dehiscentia bivalvis, apicalis........ 
A E A V. OSMUNDACLAE. 
b. Annulus completus apicalis, dehiscentia verticalis......... 
o o o VI. SCHIZEACEAE. 
TI. Sporangia exannulata, distincta y. inter se connata, sessilia. 
. Frondes vernatione circinatae.  Sporangia rima longitu- 
dinali introrsa aut poro apicali dehiscentla.....<<..<...o.... > 
VII. MARATTIACEAE. 
Frondes vernatione strictae v. pendulae; segmentis an- 
4 é | 
ticis fertilibus, contractis; sporangia subbivalvia....-.-- ars A 
A A AS AN L... VIN, OPHIOGLOSSAE. a 
' Suorpo 1. HYMENOPHYLLAE. p 
Sorí terminales y. marginales, nervis ultra limbum in recep- 
taculum columelliforme plus minusve productis, insidentes. 
Sporangia sessilla aut breviter pedicellata, obovate v. subro- 
tunda, compressa, annulo completo, obliquo cincta, verticaliter 
dehiscentia. Involucrum inferum, membranaceum, pyxidiforme 
aut cylindraceum, ore truncato v. leviter bilobo (Trichomanes), 
aut subrotundo, ore, plus minusve profunde bifido (Hymenophyl- 
lum ). Sporae tetraedrae 3-striatae. , : 
-——Filiculae saepius epiphyticae; caudice elongato gracili, repen- 
te v. adscendente, ercctove; stipitibus, sparsis aut fasciculatis, ter e 
bus aut, limbo decurrente, alatis ; lamina plerumque tenuiter membra- 
nacea, ut plurimum varie et profunde divisa, raro integra, glabra aut 
pilis stellulatis conspersa, vel tomentosa ; rachi plerumque alata, raro 
tercti; nervi pinnatim aut fabellatim dispositi.  Vernatio circinata. 
CLAVIS GENERUM. 
% a ; 
A o a 
Involucrum infundibuliforme, ore truncato v. bilobo. - --- 
A e o e e A 1. TrICHOMANES- 
Involucrum, subdisciforme, bivalve v. bilabiatum-.-.---==" 
o rl ad 0 ad 2. HyMENOPHYLLUM: 
-----.m 
Sori marginales, aut (in apice laciniarum limbi) termina- 
les.  Involucrum structura limb1, gamophyllum, 00 ve 
Re 
