960 MR. H. N. RIDLEY ON PLANTS 
POLYPODIUM CARSTENSZENSE, Ridl., sp. nov. 
Rhizoma squamis tenuibus lanceolatis acuminatis pallide brunnescentibus tectum. 
Frondes simplices, petiolate, petiolis teretibus pubescentibus 7-8 cm. longis 
gracilibus; lamina linearis, acuminata, basi cuneata, subcoriacea, margine superne 
undulata, basin versus breviter lobata lobis obtusis latis, 20 cm. longa, 1:5 em. 
lata, nervis circiter 80 undulatis, nervulis 6 brevibus. Sori elliptici, parvi, sub- 
immersi, 6 cum quoque nervo in apicibus nervulorum orti. 
Camps XI to XIV, 8300 to 10,500 ft. 
Allied to P. sumatranum, Baker, differing in the distinctly lobed fronds and flexuous 
nerves. 
POLYPODIUM PETIOLATUM, Ridl., sp. nov. 
Rhizoma gracile, squamis lanceolatis acuminatis argenteis tectum. — Frondes simplices, 
petiolate, petiolis glabris canaliculatis gracilibus 4-8 cm. longis; lamina oblanceolata, 
basi attenuata, coriacea, 12 cm. longa, 1:5—1:8 cm. lata, margine recurvo obscure 
undulato nec lobato, nervis pluribus gracilibus rectis, nervulis obscuris brevibus 6 
in utroque nervo. Sori orbiculares, majusculi, in apicibus nervulorum juxta 
nervum orti. 
Camps IX to X, 5500 to 6700 ft. 
Allied to the last species, but with different scales on the rhizome, a latius 
channelled petiole and straight nerves, shorter nervules and larger sori, which are 
elevated on the upper surface. 
PoLYPODIUM SrANLEYANUM, Baker, in Journ. Bot. xxviii. (1890) 107. 
Camps XIII to XIV, 10,500 to 12,500 ft. 
Distrib. Endemic in New Guinea. 
POLYPODIUM PAPUANUM, Ridl., sp. nov. 
Herba parva, cespitosa, 5 em. alta. rondes sessiles, lineares, anguste, 1 mm. late, 
paullo acuminate, obtuse, versus basin paullo attenuate, subcoriace®, pilis atris 
paucis munite, costa elevata, nervis celatis. „Sori in apice copiosi, elliptici, primo 
distantes, mox congesti, laminam tegentes. 
Camp III, 2500 ft. 
Allied to P. universe, Baker, but less coriaceous and less hairy, with many more sori. 
POLYPODIUM BISERIALE, Ridl., sp. nov. 
Herba crespitosa, rhizomate squamis ovatis obtusis brunneis tecto. rondes integre, 
lanceolate, acuminate, glabre, versus basin attenuate, marginibus undulatis, 
14 cm. longz, 4-5 cm. late, pilis brevissimis atris dissitis, nervis obscuris undulatis 
simplicibus, stipitibus gracilibus teretibus pubescentibus. Sori rotundi, prope 
costam a margine remoti, 1 mm. lati, 2-4-ni in lineas transversas dispositi. 
Camps VIII to IX, 4900 to 5500 ft. . 
