76 SOCIETY ISLANDS. [Musci. 



but placed a little to one side, distinguishes this from the other congeners with which it is most likely to 

 be confounded. 



1 . Trichomanes membranaceum. Linn. — Hook. Ex. Fl. t. 76. 

 Hitherto this species has been only known as a native of the West Indies. 



2. Trichomanes humile ; fronde lanceolata bipinnatifida glabra marginata, laciniis line- 

 aribus obtusis integerrimis, involucris oblongo-cylindraceis, ore bilabiato, labiis rotundatis. 

 Hook, et Grev.—" Forst. Prodr. n. 464." Sw. Syn. Fil. p. 143 et 371. Hook, et Grev. Ic. 

 Fil. t. 85.— T. minutulum. Gaud, in Freyc. Voy. p. 377. t. 12. f. 2? 



Bory (in Duperrey's Voyage) states that Gaudichaud's plant, originally from the Moluccas, had been 

 found in Tahiti by Durville; and his figure, with the exception of the magnified extremity of the involucre, 

 which is probably erroneous, answers pretty well to our plant. — This and the following belong to Desvaux's 

 genus Didymoglossum. 



3. Trichomanes Filicula ; fronde lanceolata tripinnatifida glabra, laciniis linearibus ob- 

 tusis integerrimis, involucris oblongo-cylindraceis, ore bilabiato, labiis ovatis acutiusculis. — 

 Bory in Duperrey Voy. v. 1. p. 283. — T. bipunctatum. Poir. — Hymenophyllum Filicula. 

 mild. Sp. PL v. 5. p. 528. 



Notwithstanding some slight diiference between Willdenow's description and the above character, we 

 believe our plant to be the same ; the more so as Bory states that Durville has likewise met with it in Tahiti. 

 We have long ago received it from Mr. Menzies, under the manuscript name of T. bilingue. 



1. Alsophila extensa ; frondibus triplicato-pinnatis, pinnis acuminatis, pinnulis lineari- 

 oblongis obtusis serrulatis, rachi punctato-aspero, caudice arboreo. — Polypodium extensum. 

 " Forst. Prodr. n. 453." — Cyathea extensa. Sw. Syn. Fil. p. 139 et 364. Schkuhr, Fil. t. 

 132. — Alsophila extensa. Desv. 



We may here remark that Mr. Collie gives a list of fifty-two species of Ferns collected in Tahiti ; whereas 

 we can find only forty-one in the Collection ; and, in Mr. Collie's notes, the Sadleria is not noticed. 



Ord. LIII. MUSCI. Juss. 



1. Octoblepharum albidum. Hedw. 



1. Dicranum bryoides ; j3. osmundioides. Am. Disp. Muse. p. 28. — D. osmundioides. 

 Engl. Bot. t. 1662. 



1. Orthotricum apieulatum? Hook. Muse. Exot. t. 45. 



. The specimen in the Collection is in a young state, so that we cannot be positive of its identity with the 

 Mexican species ; the calyptra, also, is here provided with a few hairs, while in the other it is decidedly 

 glabrous. 



1. Neckera undulata. Hedw. Muse. Frond, v. 3. t. 21. 



The Hypnum duplicatum, (Hedw. Sp. Muse. Supp. 3. t. 279,) gathered by Mr. Menzies in Tahiti, appears 

 to us merely Neckera pennata, found there also by Durville. 



2. Neckera filicina. Hedw. Muse. Frond, v. 3. t. 18. 



1. Hypnum Chamissonis. Hornsch. Hor. Phys. Ber. p. 66. t. 13. 



Our authentic specimens of H. Chamissonis differ from those in the Collection by having rather smaller 

 thecse ; but we can perceive no other distinction. The theca is perfectly straight, and nodding (not cernu- 

 ous) by the curvature of the top of the seta. 



2. Hypnum fuscescens ; caule vage ramoso laxe csespitoso prostrato, foliis distichis sub- 



