88 CRTPTOGAMIA. 



fusiformibus; capsula clavato-obovata arcuata horizontally operculo 

 permagno cupulato longissime rostraio f calyptra deficiente). 



Hookeria debilis, Sulliv. in Proceed. Amer. Acad. Art. Sci. Jan. 1854. 



Hab. Feejee Islands ; also Samoan Islands : growing on a fern. 



A small, pale-green moss, of a delicate, flaccid texture, and of a 

 plumulose aspect. Stems prostrate, creeping, 1-2 inches long, with a 

 few irregular branches. Leaves lanceolate, filiformly attenuated, 

 rather distant, bifarious, flexuose, of a very loose reticulation; the 

 areolae fusiform, pellucid, the intersecting lines broad, pale green. 

 Capsule elongated, arcuate, horizontal, gradually tapering from the 

 wide mouth into the pedicel. Operculum long as the capsule, with a 

 large, hemispherical base, and a subulate, decurved rostrum. Teeth 

 of the peristome linear-acuminate, densely articulated, the two series 

 of the outer stratum widely separated to near the point ; the cells of 

 the inner stratum forming strong, projecting lamellae ; the processes 

 of the inner peristome carinate, arising from a plicate membrane. 

 Pedicel smooth, erect from the main stem. Pericheetial leaves nume- 

 rous, the inner ones long, convolute, with an abrupt, filiform point. 

 Calyptra not seen. 



The specimens are few and imperfect, furnishing only one capsule, 

 and that perhaps not in a normal state. 



Plate 21, B. — Hookeria debilis : plant, of the natural size. Fig. 

 1. Portion of a branch. 2, 3, 4. Leaves. 5. Leaf, showing the reti- 

 culation. 6. Perichaatium and calyptra. 7, 8. Perichsetial leaves 

 and antheridium. 9. Antheridia on the vaginula. 10. Portion of 

 the peristome. 11. Capsule.— Details enlarged. 



5. MNIADELPHUS, C. Mull. 



Mniadelphus, C. Mull. Bot. Zeit. 1847, p. 938 ; Synop. Muse. Frond. 2, p. 20. 



