174 MB. w. mitten's list or samoan mosses. 



Pteehobryum, gen. nov. 



Caulis erecttis, simplex, rarius divisus. Folia undiq^iie inserta, in- 

 feriora minora sensiin versus caulium altitudinem mediam ma- 

 jora, exinde ad apieem decrescentia, rigida, nervo rigido valido 

 percurrente excnrrenteve marginibusque argute serratis, cellulis 

 parvis rotundis limitibus latis rigidis obscuris. Fructus in 

 ramulo brevissimo basilari. Theca cylindracea, plicata, horizon- 

 talis, operculo rostrato, peristomio Stereodontis. Calyptra cu- 

 cullata. 



P, SET0SUM3 sp. n. Dioicum; folia in ramis sterilibus patentia, api- 

 calia, erecta, appressa, recta subsecundave, a basi sensim subulata, an- 

 gusta, elongata, setacea, rigida, nervo crasso percurrente, superne dorso 

 dentato, margine incrassata, basi integerrima, superne breviter dupli- 

 cato-dentata, a medio usque ad aplcem dentibus validioribus simpli- 

 cibus serrata^ cellulis parvis rotundis limitibus latis ; perichaitium m 

 ramo brevi, foliis a basi parva ovata longe anguste subulata curvata, 

 nervo excurrente marginibusque superne dentatis. Habitus P. spi' 

 niformis. 



Hah. Upolu, on trees on the way to Lanutoo (2000 ft.). No. 11. 



Size, mode of growth, and colour of the foliage as in P. spini' 



forme J Linn. {IlypnuTri)^ but with leaves scarcely half as wide, 



more bristle-like and rigid ; the teeth tow^ards the apex of the 



leaf are evidently a continuation of the margin ; so that the nerve 



is not terete and excurrent, as is stated to be the case in -P. 



+ 



pxmgens^ SulL Amer. Expl. Exp, {lihizogonium)^ which appears 

 also to be a much larger species in all its parts. 



P. SPiNiFORME, hinn, {Hypnum) y ioxxaa. Samoana. Folia angustisslme 

 lineari-lanceolata, nervo percurrente, dorso dentata, margine duplieato 

 serrata; perichsetialia ovato-subulata, simpliciter serrulata; theca ob- 

 longa, operculo brevirostro, peristomio interne processibus quamdentes 

 brevioribus in merabrana fere ad eorum medium exserta iiupositis, 

 ciliis obsoletis. 



Hab. Upolu, on trees (1000-2000 ft.). No. 90. 



A little more slender than the usual states of this common 

 Tropical- American species, and possibly distinct ; but the cilia are 

 not uniform in length or number in American specimens. 



latifolium 



that region. 



P. LOXGIFLORUM, sp. n. Dioicum ? foha in caule sterili patula, in- 

 curva, anguste lineari-elliptico-lanceolata, basi angustata, nervo crasso 

 superne dorso dentate percurrente, marginibus incrassatis et dentibus 

 brevibus duplicatis serratis, cellulis parvis rotundis firmis ; folia no- 



