MATERIALS FOR A FLORA OF FORMOSA. 429 
em. latis apice acuminatis basin obtusis, pinnulis LL. infimis oblique 
ovatis latere superiore majoribus 11mm. longis 6 mm. latis 
apice aristatis basi cuneato-attenuatis brevissime — petiolulatis 
margine 3-4-5-serrulatis, serrulis aristatis ; rhaches frondium com- 
planatz supra sulcatee (etiamque) a latere sulcatee subtus convexe ; 
rhaches pinnarum complanatz supra suleatse sursum subalate, 
subtus parcissime squamatee. Frondes (fertiles) lanceolats vel ovate 
in ambitu, apice lineari-acuminatx basi obtuse, partibus inferio- 
ribus tripinnatis, superioribus bi-pmnatis, versus apicem simpliciter 
pinnatis, pinnis utraque latere 12 inferioribus 5 cm. a se remotis, 
longissimis 9 mm. longis remote pinnatis cire. linearibus, pinnulis I. 
linearibus ; pinnulis I. ovatis acutis basi attenuatis 7 mm. longis 
3 mm. latis margine 3-4-dentato-lobatis, lobis ascendentibus acutis 
ad tatam laminam soriferis cum soris reflexis. | Sori sub quoque lobo 
circ, 1, interdum 2, prope costas siti, globosi, 2 mm. in diametro, 
a se approximati, totam paginam occupantcs. Indusium globosum 
basi profunde cordatum 2 mm. in diametro. 
Has. Liukiu: Nagodake, Aprili. 1907, leg. G. Nawanara. 
The present plant is very remarkable for its dimorphous fronds. 
It is very near Polystichum apiifolium (Sw.) C. CHRISTENSEN, but 
differs from it by the much contracted fertile fronds. ‘This and 
its congener are so different from any other species of the genus, 
that it is much desirable to have a subgenus for them. 
Gymnopteris PRESL. 
Gymnopteris contaminans Bepp.; Hayata in Tokyo Bot. Mag. 
AL 26; 
Dipteris REINWARDT. 
Dipteris conjugata Reinw.; C. Curisrensen Ind. Fil. p, 242. 
