68 CRYPTOGAM I A. 



A species with the habit and aspect of Oinclidotus. Color blackish 

 green. Stems attached at base only by a dense mass of rootlets ; 5-7 

 inches long, divided into numerous long, floating, sparsely ramulose 

 branches. Leaves distant, patent either in a dry or moist state, occa- 

 sionally with a tendency to twist; oblong, or linear-lanceolate, acumi- 

 nate, slightly carinate-concave, serrulate above, with a strong continu- 

 ous costa, which is serrate on the back near the apex; margins with a 

 thickened border resembling the costa; texture firm, dense; cellules 

 rather minute; those above oblong, sab-opaque, with the primordial 

 utricle more or less distinct ; those below, linear-oblong, subpellucid. 



Hypnum conspissatum, which this species very much resembles, is a 

 somewhat larger plant, with leaves more crowded; falcato-secund less 

 oblong, more gradually acuminate, and long-cuspidate by the excur- 

 rent costa ; the margins are not serrate, nor the costa on the back near 

 the apex : moreover, the reticulation is smaller. 



Plate 16, A. — Hypnum limbatum : plant, of the natural size. Fig. 

 1, 2. Portions of stems with leaves. 3, 4, 5, 6, 7. Leaves. 8. Cross 

 section of leaf. 9. Portion of base of leaf, showing the reticulation. 

 10. Point of leaf, showing the same. 11. Cellules of leaf.— Details 

 enlarged. 



Sec. 12. Uncinata : caulis ascendens fastigiato-divisus ; folia falcato- 

 secunda unicostata. 



48. Hypnum aduncum, Hedw. 



Hypnum aduncum, Hedw. Stirp. Crypt. 4, p. 62, t. 24: Bryol. Europ. 6, Hyp. 



Monogr. p. 35, t. 24. 



Hab. Orange Harbor, Fuegia. Andes (as high as the snow-line), 

 behind Santiago, Chili. Specimens from both localities barren. 



49. Hypnum fluitans, Linn. 



Eypnum fluitans, Linn. Flo. Suec. ed. 2, p. 399; Bryol. Europ. 6, Hyp. Monogr. p. 

 33, t. 22. 



