m u s c i. 47 



Plate 9, B. — Htpnum tricostatum : plant, of the natural size. 

 Fig. 1. A portion of the stem, with leaves. 2, 3, 4. Leaves. 5, 6. Cross 

 sections of a leaf. 7. Point of a leaf, showing the reticulation. 8. 

 Marginal portion of leaf, showing the same. 9. Perichsetium. 10, 11, 

 12. PerichaBtial leaves. 13. Archegonium and paraphyses. — Details 

 magnified. 



10. Htpnum speciosissimum, Sulliv. (Tab. 9.) 



H. dioicum, datum, frondiforme ; caule secundario erecto in/erne subnudo 

 stipiformi superne pinnato-ramoso ; foliis linear i-lanceolatis longissime 

 acuminatis costa dorso superne dentata excurrente cuspidatis supra 

 medium serratis indistincte limbatis dense linear i-areolatis ; perigoniis 

 (planta mascula sola visa J numerosissimis conspicuis. 



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



Hab. Feejee Islands. 



A large striking plant, of a fern-like aspect : light chestnut the pre- 

 dominant color of the foliage. Male plants only, seen. Primary stem 

 or rhizoma large, prostrate, covered with dark-purple radicles. From 

 the rhizoma arise erect steins, 7-8 inches high ; their lower half a firm, 

 stiff, blackish stipe, apparently naked, but furnished with scattered, 

 closely appressed, scale-like leaves; their upper half throwing out 

 equally on both sides, and in the same plane, numerous crowded 

 branches; the branches patent-divergent; the upper ones straight, 

 simple ; the lower more or less flexuous, with a few short branchlets. 

 Leaves of the central stem, large, distant, bifarious, triangular-lanceo- 

 late, long-acuminate, slightly concave : leaves of the branches and 

 branchlets much narrower, erect-patent, crowded, from an oblong 

 elliptical base, produced into a very long linear point, four times the 

 length of the base : both kinds of leaves acutely serrate above, cuspi- 

 date by a firm, rigid, excurrent costa, dentate on the back near its 

 apex ; their margins more or less thickened ; areolation opaque, dense, 

 very minute; cellules pachydermous, linear, tapering at each end. 

 Male flowers numerous, large, conspicuous, ellipsoidal, acuminate, sub- 



