188 MR. W, mitten's list of SAMOA.N MOSSES. 



longa, sicca infra os plicata, g}^mnostoma? basi collo sensim angus- 

 tatOj calyptra angusta Isevi pallida filis paucis elongatis pilosa ; planta 

 mascula gracilior, floribus parvis gemmseformibus, antheridiis pluri- 

 bus paraphysibus sequilougis immixtis repletis. 



Hab. Tutuila, on a Cocoanut-tree a little inland, FangasEl Bay (l- 

 2 ft.). No. 43. 



Grrowing in extensive thin mats of a dull green colour, the 



stems everywhere closely attached to the bark or stone by the 

 abundant rusty-brown roots. The leaves, when dry, uniformly 

 closely rolled inwards towards the stem ; in the wet state, from 

 the shortness of those leaves arising from the upperside of the 

 stem, the foliage appears, compressed. 



This genus agrees nearly with STiacopilum^ and must be ar- 

 ranged in the same natural family with it. 



Thyeidixjm, gen. nov. 



Caulis repens. Eami erecti, apice fructiferi. Folia basi cellulis 

 hyalinis a superioribus conspicue diversis areolata, Theca 

 »qualis, Isevis. Peristomium duplex, externum dentibus 16, in- 

 ternum ciliis totidem, membranse parum exsertge impositis, con- 

 niventibus, nullisve. Calyptra latere fissa, cucuUiformis. 

 CodonoblepTiarumy Dozy et Molk. Muse. Archip. Ind. p. 95, t. 33. 

 Calymperes et Syrrhopodon auctorum ex parte. 



The group of mosses here proposed to be separated from Ca- 

 lymperes and Byrrliopodon contains, beside those obtained by 

 Mr. Powell, the East-Indian T. repens^ Harvey (Syrrhopodori)^ 

 T. Jungquilianum^ Mitten, Bryol. Javan.t. 46 {Syrrhopodon) ^ and 

 some others as yet undescribed, all, with the exception of a single 

 South-American species gathered by Mr. Spruce, found in the 

 Indian archipelago and Pacific islands. From CodonollepTiarum^ 

 Schw., founded on C. Meroziesii^ Thyridium differs in its creeping 

 stems and in the structure of its leaves being similar to that of 

 Calymperes and SyrrJiopodon, 



T. constrictum, SulL Amer. ExpL Exp. p. 6, t. 3* f A. 



Hah. Tutuila, on trees. No. 49. 



Bemarkable for its tristichous leaves ; the fruit is still un- 

 known. 



T. LUTEUM, sp. n. Rami elongati; foha a basi brevi erectiore, ad in- 

 sertionem constricta, superne parum latiora, patentia, sicca contorta 

 subsecunda, linearia, elongata, sensim acuminata, nerve percurrente, 

 margine undulata, serrulata, limbo inferne latiore, infra apicem eva- 

 nido, cellulis hyalinis spatium parvum occupantibus, rehquis omnibus 



