52 CRYPTOGAMIA. 



ascending. Leaves loosely and bifariously imbricated, spreading, from 

 a broad subtruncate concave base, oblong-lanceolate, gradually taper- 

 ing into a sharp point ; costa very short or nearly obsolete ; margins 

 erect and entire; areolation rather lax, composed of cellules long 

 and flexuous except at the basal angles, where they are shorter, wider, 

 and more pellucid. Capsules cernuous, short, hypnoid, with a weak 

 flexuous and smooth pedicel 4-5 lines high. Teeth of the peristome 

 linear-lanceolate : cilia carinate from a broad membrane, of the same 

 length as the teeth : ciliolse single. Perichsetial leaves few, loosely 

 imbricated, erect, the upper ones with long attenuated points. Anthe- 

 ridia 4-5, without paraphyses. 



Closely related to H. graciUsetum, H. et R, but is a smaller and 

 more flaccid species, constantly monoicous, has leaves with entire mar- 

 gins, and perichaetial leaves gradually acuminated. The ramification 

 is also different. 



Plate 11, A.— Htpnum molliculum: plant, of the natural size. 

 Fig. 1. Portion of stem, with leaves and radicles. 2, 3, 4, 5, 6. Leaves. 

 7, 8, 9. Portions of same, showing the reticulation. 10, 11. Cap- 

 sules. 12. Operculum. 13. Portion of the double peristome. 14. Peri- 

 chaetium. 15. Perichaatial leaf. 16. Male bud. 17. Antheridia, para, 

 physes, and perigonial leaf. — Details magnified. 



18. Hypnum tenuisetum, Sulliv. (Tab. 13.) 



R rnonoicum; eaule prostrate tenui flexili extenso parce diviso, dim, 

 sionibus dissite breviter pinnatis ; foliis laxis subbif arils ovato-Ianceo- 

 latls serralatis leniter papillosw subecostatis lineari-areolatis, cellulis 

 marginalibus distinciioribus, alaribm amplis inflatis ; capsula exigua 

 hypnoidea, pedicellis numerosis longis gracilibus. 



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



Hab. Tutuila, Samoan, or Navigator's Islands. 



Stems prostrate, creeping, 4-5 inches long, at the ends flagelliform, 

 two or three times divided, pinnate, branchlets short and distant. 



