M U S C I. 51 



Plate 11, B. — Hypnum op^odon : plant, of the natural size. 

 Fig. 1. Portion of a branch. 2, 3, 4, 5, 6, 7, 8. Leaves. 9, 10, 11. 

 Capsules. 12. Operculum. 13. Calyptra. 14. Portion of the double 

 peristome. 15. Tooth of outer peristome. 16, 17. Point and base of 

 leaf, showing the reticulation. 18. Perichsetium. 19, 20. Perichaetial 

 leaves. — Details magnified. 



15. Hypnum circinale, Booh. 

 Hypnum circinale, Hook. Muse. Exot. t. 107 J MiLll. Synop. Muse. Frond. 2, p. 318. 

 Hab. Fort Nisqually, Port Discovery, and Spipen River, Oregon. 



16. Hypnum geacilisetum, Hscli. et Rienw. 



Hypnum gracilisetum, Hsch. & Rienw. Nov. Act. Acad. Cses. Leop. 14, 2, Suppl. 



p. 727 ; Schwsegr. Suppl. 3, 1, t. 220. 

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



Hab. Southeast coast of the District of Puna; also base of Mauna 

 Kea, Hawaii, Sandwich Islands. 



17. Hypnum molliculum, Sulliv. (Tab. 11.) 



H. monoicum, pusillum, flaccidum ; caule prostrato vage diviso, ramis 

 ascendei)tibus laxe foliosis ; foliis oblongo-lanceolatis attenuatis obsolete 

 bicostatis lineari-areolatis, eellulis alaribus majoribus ; capsuld cernua 

 gibboso-oblonga ; pedicello debili flexuoso. 



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



Hab. Forests at the Eastern base of Mauna Kea, Hawaii, Sandwich 

 Islands. 



A small, delicate, flaccid species, with yellowish-green shining foli- 

 age, and a loose mode of growth. Stem prostrate, branches weak, 



