54 CRYPTOGAIIA. 



pedicel smooth, long, slender, its upper part forming a large gradual 

 arch. Male flowers gemmiform, situated on the stem and its main 

 divisions. Antheridia 8-10, paraph ysated. 



Plate 12, A. — Hypnum arcuatum: plant, of the natural size. 

 Fig. 1. A plant. 2. Portion of the stem, with leaves. 3, 4, 5, 6. Leaves. 

 7, 8. Portions of a leaf, showing the reticulation. 9. Cellules of the 

 same. 10. PerichaBtium. 11. Vaginula. 12. Perichsetial leaf. 13,14, 

 15, 16. Capsules. 17. Same, in a dry state. 18. Portion of the double 

 peristome. 19. Vertical section of the same. 20. Male bud. 21. Anthe- 

 ridium and paraphysis. 22. Perigonial leaf. — Analyses enlarged. 



20. Hypnum sodale, Sulliv. (Tab. 12.) 



H. dioicum, pusillum, deplqnato-ccespitans ; caule fasciculatirn diviso, 

 divisionibus dense plnnatis ; foliis lanceolato-attenuatis falcatis secun- 

 dis vix serrulatis, costellis binis brevissimis, areolatione linear i; capsula 

 ovali pendula, operculo depresso-conico recte rostellato, pedicelh longi- 

 usculo tenui. 



Hypnum sodale, Sulliv. in Proceed. Anier. Acad. Art. Sci. (Jan. 1854.) 

 Hypnum molluscoides, Sulliv. 1. c. 



Hab. Tahiti and Eimeo, Society Islands. 



A small moss, of a soft, pliable texture, forming extended spongy 

 mats; foliage light-yellow. Stems procumbent, about two inches 

 long; fasciculately branched, closely and regularly pinnated as in 

 Hypnum molluscum. Leaves from a broad ovate base, gradually taper- 

 ing into long, falcate, secund points, scarcely serrulate, with two short 

 indistinct costa3 at base ; areolation minute linear. Perichsetial leaves 

 linear-oblong, convolute, with attenuated spreading points. Capsule 

 minute, oval, pendulous, mouth large : teeth of the peristome lanceo- 

 late-subulate, articulations close; cilia carinate, imperforate, from a 

 broad plicate membrane; ciliolae single, occasionally in pairs, unusu- 

 ally .large, granular, sometimes rimose: annulus persistent. Opercu- 

 lum hemispherico-conic, with a short straight rostrum. Dioecious. 



