m u s o i. 57 



25. Hypnum Oreganum, Sulliv. (Tab. 13.) 



Bypnum Oreganum, Sulliv. in Mem. Amer. Acad. Art. Sci. p. 172. (1849.) 

 Hypnum Stokesii, Mull. Synop. Muse. Frond. 2, p'. 448, as to the Columbia River 

 specimens. 



Hab. Puget Sound, Oregon. 



There is a very close affinity between this moss and Hypnum Stokesii, 

 Turn. Rigid examination, with a fuller suite of specimens of the lat- 

 ter species than are now at hand, may prove the Oregon moss to be 

 only a remarkable variety of the same. Compared with the descrip- 

 tion and figure of H. Stokesii, Turn., in the admirable Bryologia 

 Europaea, our moss is larger and more robust: the stems are pros- 

 trate, creeping, 6-12 or more inches in length, once or twice divided, 

 regularly and closely pinnated, very similar in aspect to those of 

 Hyp. Crista- Castrensis (not with short divisions, simple below and 

 pinnated above, the pinnae decreasing rapidly in length towards the 

 ends of the divisions) : the leaves are of a thinner and firmer texture ; 

 the areolae longer and narrower: the basal angles not so convex 

 interiorly : and the perichaetial leaves are reflexed (not simply 

 patent) . 



In this moss, as in H. Stokesii, are found, on the sides of the stems, 

 clusters of minute leaves (paraphyllia (?) Bryol. Europ.) surrounding 

 the germinating point of a branchlet. 



Plate 13, B. — Hypnum Oreganum : male and female plants, of the 

 natural size. Fig. 1. Portion of a branch. 2, 3, 4, 5. Leaves. 6, 7, 8. 

 Portions of a leaf, showing the reticulation. 9. Cross sections of leaf. 

 10, 11, 12. Bud-leaves, or paraphyllia. 13, 14, 15. Capsules. 16. Por- 

 tion of the double peristome. 17. Portion of the pedicel. 18. Peri- 

 chaetium. 19, 20, 21. Perichaetial leaves. 22. Male bud in the axil 

 of a leaf. 23. Male bud detached. 24. Perigonial leaves. 25. Anthe- 

 ridium and a paraphysis. — Details magnified. 



15 



