358 FLORA VITIENSIS. 
nulis dimidiatis, subecostatis, articulatis.— Monochlena, Gaud. Voy. Freyc. p.340. Ceranium, Reinw. 
Syllog. Pl. Nov. vol. ii. p. 2. Tegudaria, Reinw. l. c. p. 3. 
l. D. lunulata, Desv. Mém. Soc. Linn. vol. vi. p. 282; stipitibus dense paleaceis ; frondibus am- 
plis, coriaceis, glabris, oblongis, bipinnatis ; pinnulis subsessilibus, e basi inferiore dimidiatis, superiore 
truncatis, subtrapezoideo-oblongis, obtusis, denticulatis, costa oblique percursis ; nervis subflabellatis, 
sterilibus apice ad basin dentium incrassatis; soris oblongis, venula antica impositis, indusio coriaceo 
persistente.— Adiantum lunulatum, Houtt. Syst. Pl. xiii. p. 252. t. 100. fig. 1. Aspidium truncatu- 
lum, Sw. Syn. Fil. p.52. Didymochlena truncatula, J. Sm. Hook. Journ. vol. v. p.196. D. sinuosa, 
Desv. Berl. Mag. vol. v. p. 303.— Viti (Seemann! n. 751). 
XXIV. Polystichum, Roth, Tent. Fl. Germ. vol. iii. p. 69. Sporangia receptaculo ex medio 
v. rare apice venularum imposita, in soros globosos collecta. Indusia orbicularia, peltata, margine 
undique libera. Venz e costa pinnato-furcatz v. furcatz, venulis liberis.—Filices caudice brevi 
erecto, frondibus simplicibus pinnatis v. bi-tripinnatis rigidis coriaceis, margine plerumque mucronato- 
serratis.—Peltochlena, Fée, Gen. Polyp. p. 289. Cyclopeltis, J. Sm. Ferns Brit. and For. p. 165. 
Hemicardion, Fée, Gen. Polyp. p. 282. | 
In addition to the species described, the following occur in tropical Polynesia :—1. JP. vestitum, Presl, 
Tent. Pter. p. 83, from the Pacific Isles (Forster !), Tutu Island, New Hebrides (C. Moore!). 2. P. Hille- 
brandii, Carv. ms., from Sandwich Isles (Hillebrand !), distinguished from P. aculeatum, Roth, by the more 
coriaceous frond, the pinnules entire or with a single tooth on either side, and with an acute spinulose apex, 
the rachis and nerves furnished with long toothed scales, and the orbicular indusium with a tumid centre. 
3. P. Haleakalense, Brack. U. S. Expl. Exped. Filices, p. 204. Oahu (Macrae! U.S. Expl. Exped.). 
Aspidium adianteforme, Forst. Prodr. n. 449 ( P. coriaceum, Schott), said to be from the Pacific Isles, 
is most probably from New Zealand. ; 
1. P. semicordatum, T. Moore, Ind. Fil. p. 103 ; stipitibus semiteretibus, basi paleis ferrugineis 
lanceolatis obsitis, saperne puberulis; frondibus subcoriaceis, glabris, elongato-lanceolatis, pinnatis ; 
pinnis patentibus sessilibus, basi cordatis auriculatis, auricula sursum spectante elongato-oblongis, 
deorsum spectante magna falcata; linearibus acuminatis subintegris, inferioribus. remotis paullulum 
abbreviatis, superioribus approximatis sensim decrescentibus, supremis cum terminali confluentibus 
nervis 2-3-furcatis ; soris 1 (-8)-seriatis, infra apice venularum impositis, indusio fugace.—Aspidium 
semicordatum, Sw. Syn. Fil. p. 45. Lastrea semicordata, Presl, Tent. Pterid. p. 77. 
2. P. aristatum, Presl, Tent. Pterid. p. 83; rhizomate brevi; stipitibus villosiusculis, basi 
squamatis ; frondibus ovato-deltoideis v. deltoideo-lanceolatis, valde coriaceis, glabris, subtus incano- 
nitentibus, tri- v. quadripinnatis, pinnulis basi adnatis v. stipitatis ovato-oblongis, serratis v. pinna- 
tifidis, serraturis mucronatis; soris medio venularum insertis, indusiis orbicularibus.— Polypodium 
aristatum, Forst. Prodr. n. 448, — Aspidium aristatum, Swartz, Syn. Fil. p. 58. Lastrea aristata, T. 
Moore, Ind. Fil. p. 86.—Viti (Seemann! n. 742, Sir E. Home! M‘Gillivray!). Also from Tahiti 
(Forster! Banks and Solander! Nelson !), Sunday Island (Milne!), Aneitum (M‘Gillivray !), and 
St. Christina (Collie !). 
XXV. Lastrea, Bory, Dict. Class. d’Hist. Nat. vol. vi. p.588. Sporangia receptaculo ex medio 
rare apice v. sub apice venularum imposita, in soros globosos collecta. Indusia reniformia, plana v. 
fornicata, fugacia v. persistentia. Venz e costa simplices furcate v. pinnatze, venulis liberis.— Filices 
caudice erecto decumbente v. repente, frondibus pedatis, pinnatis v. bi-tripinnatis.— Dryopteris, Adan- 
son, Fam. d. Pl. 20. Gleichenia, Necker, Elem. Bot. vol. iii. p. 314. Dichasium, A. Braun, Flora, 
vol. xxiv. p. 710. Thelypteris, Schott, Gen. Fil. ie 
In addition to the species recorded, the following have been noticed in tropical Polynesia :—l1. L. 
