discovered or described since 1874 . 477 
Summit peak of the Island of Ternate, Moseley (Challenger 
expedition). 
333*. P. costulatum, Baker, in Journ. Bot. 1880, 215; Aerostichum 
costulalum , Cesati, Fil. Beec. Polyn. 8. Mount Singalan, 
Sumatra, alt. 5000-6000 ft., Beccaru 
334. P. triquetrum, Blume. Has now been found in Ternate, New 
Guinea, Samoa, and Fiji. 
334*. P. leucophorum, Baker, in Journ. Linn. Soc. XXII, 229. 
Sarawak, Borneo, Bishop Hose , 129. 
335. P. rupestre, Blume. Has now been found in Sumatra and 
Perak. 
336. P. ovatum, Wall. Has now been found in several localities 
in China, and is evidently a mere form of the Japanese 
P, ensatum , Thunb., our No. 344. 
336*. P. dimorphum, Baker, sp. n. Rhizome stout, woody, short- 
creeping. Fronds dimorphic ; sterile many, with a slightly 
paleacous stipe, 2-3 in. long, and a simple oblong-lanceolate 
acuminate blade 3-4 in. long, 18-21 lines broad at the middle, 
narrowed to the base ; fertile with a stipe 7-8 in. long, and a 
lanceolate blade under an inch broad. Main veins of sterile 
frond erecto-patent, flexuose, -J in. apart, not quite reaching 
the edge. Sori irregularly 2-3-seriate between the main veins, 
large, globose or two confluent in an oblong mass. Hainan, 
Formosa, Rev. B. S. Henry. Near P. triquetrum. 
337. P. platyphyllum, Sw. Has been found in Perak by Scorte- 
chini. 
338*. P. Picoti, Rev. Hist. 1886, 20, fig. 62. Brazil; not deter- 
minable. May be a form of crassi/olium. 
339. P. membranaceum, Don. Has now been found in West 
China and the Philippines. 
339*. P. Lastii, Baker, in Journ. Bot. 1891, 5. North-West Mada- 
gascar, Last. Very near P. membranaceum. 
339*. P. Scortechinii, Baker, sp. n. Rhizome woody, wide-creeping, 
flexuose, calvate. Stipe brown, naked, 15-16 in. long. Frond 
oblanceolate, acuminate, membranous, glabrous, 1 6- 18 in. long, 
3-3 1 in. broad, obscurely repand, narrowed gradually from the 
middle to the base. Main veins distinct to the edge J-in. 
apart. Sori minute, superficial, scattered all over the surface 
of the frond, often confluent. Perak, Scortechini. 
L 1 
