m u s c i. 53 



Leaves spreading, loose, subbifarious, ovate-lanceolate, concave, serrate, 

 with two short indistinct costee at base : areolation linear ; the cellules 

 minute, slightly papillose, the marginal ones larger, conspicuous, three 

 or four at each of the basal angles, large, oblong, inflated. Capsule 

 minute, oblong, gibbous, horizontal: peristome (injured) evidently 

 hypnoid : pedicels numerous, long, slender. Perichsetial leaves fili- 

 formly attenuated, flexuose, serrate, papillose on the back. Male flow- 

 ers on the main stem, paraphysated. Operculum and calyptra not 

 seen. 



Plate 13, A. — Hypnum tenuisetum: plant, of the natural size. 

 Fig. 1. A branch. 2, 3, 4. Leaves. 5, 6. Portions of leaves, showing 

 the reticulation. 7, 8, 9. Capsules. 10. Portion of the double peri- 

 stome. 11. Perichsetiuin. 12. Perichsetial leaf. 13. Male bud. 14. 

 The same, in the axil of a leaf. 15. Antheridium and paraphysis. — 

 Details magnified. 



•j- f Capsula pendula subcequalis. 



19. Hypnum arcuatum, Sulliv. (Tab. 12.) 



K rnonokum, plumulosum, delicatulum; caule prostrate rectangulate 

 diviso, divisionibus dense pinnatis; foliis lanceolatis acuminatis ser- 

 rulatis ecostatis plus minus falcato-secundis Mneari-areolatis ; capsidis 

 oblongis subcequalibus pendulis, operculo hemisphcerico-conico, pedicellis 

 longissimis apice valde arcuatis. 



Hypnum arcuatum, Sulliv. in Proceed. Amer. Acad. Art. Sci. (Jan. 1854.) 



Hab. District of Puna, Hawaii, and East Maui, Sandwich Islands. 



A dedicate, feathery species, of a golden-yellow. Stems prostrate, 

 with a few short rectangular densely pinnate branches: the branch- 

 lets subcompressed. Leaves lanceolate, acuminate, serrulate, ecostate, 

 bifariously imbricated, subfalcato-secund, not crowded ; areolation mi- 

 nute, linear. Capsule suboval, nearly symmetrical, pendulous; peri- 

 stome hypnoid, ciliote short, single. Operculum hemispherico-conic ; 



14 



