M U 8 Q I. 55 



Resembles very much, small forms of Hypnum molluscum, but has 

 differently-shaped capsules, and leaves less distinctly serrated. 



Plate 12, B. — Hypnum sodale : plant, of the natural size. Fig. 1. 

 Part of a branch. 2, 3, 4. Leaves. 5. A leaf, showing the reticula- 

 tion. 6. Cellules. 7, 8, 9. Capsules. 10. Portion of the double peri- 

 stome. 11. Portion of the annulus. 12. Pericheetium. 13, 14. Pe- 

 richaetial leaves. — Details magnified. 



21. Hypnum Tutuilum, Sulliv, (Tab. 10.) 



H. monoicum; caule prostrate* extenso diviso densissime pinnato ; foliis 

 e basi constricta ovato-lanceolatis decurvo falcatis subrugulosis brevis- 

 shne bicostatis, cellulis linearibus; capsida ovali plagiostoma annulata, 

 operculo convexo conico, pedicello flexuoso erecto. 



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



Hab. Tutuila, Samoan or Navigator's Islands. 



Stems 4-5 inches long, slender, prostrate, with two or three main 

 divisions densely pinnate. Leaves from a constricted base, ovate-lan- 

 ceolate, decurved-falcate, serrulate, subrugulose, slightly bicostate at 

 base, areolation linear. Capsule suboval, pendulous, mouth slightly 

 oblique : teeth of the peristome lanceolate-subulate ; the ciliolae in 

 threes, equal in length to the cilia: operculum hemispherico-conic ; 

 pedicel smooth, long, erect, flexuous. Perichietial leaves with attenu- 

 ated reflexed serrate points. Monoicous : male flowers situated on the 

 main divisions of the stem, paraphysated. 



Plate 10, A. — Hypnum Tutuilum : plant, of the natural size. 

 Fig. 1. Portion of stem and leaves. 2, 3, 4, 5, 6. Stem-leaves. 7. 

 Perichsetial leaf. 8, 9, 10. Portions of leaf, showing the reticula- 

 tion. 11, 12, 13. Capsules. 14. Portion of the double peristome. 

 15. Vertical section of the same. 16. Male bud. 17. Perigonial leaf. 

 18. Antheridium and paraphysis. — Analyses enlarged. 



