POLYTRICHUM. 25 



HAB. On heaths. 



Stems short, destitute of leaves at the base. 

 4. P. juniperinum; leaves lanceolato-subulate, their margins in- 

 volute, entire, their points acuminated, coloured, subser- 

 rated; capsule ovate, obtusely quadrangular, furnished with 

 an apophysis ; lid conical. (TAB. X.) 



P. juniperinum. IFild. Fl. Berol. Hediv. Sp. Mmc. t. 18. Turn. 

 Muse. Hb. p. 82. Engl Bot. t. 1200. Menzies in Linn. Trans, v. 4. 

 t. 6.f. 4. P. juniperifolium. Hoffm.Mohr.Moug. et Nestl. n. 41/. 

 P. strictum. Menzies in Linn. Trans, v. 4. t. J.f. 1. Turn. Muse. H&. 

 p. 83. Engl. Bot. t. 2435. P. alpestre. Hoppe. Schwaegr. Suppl. 

 t.97. 



HAB. On heaths. 



We can perceive no other difference between the P. slric- 

 tum and P. juniperinum than that the former is branched, 

 while the stems of the latter are undivided ; and we there*- 

 fore cordially assent to the opinion of Mr. Turner in consi- 

 dering them as the same species. Following Mohr also, we 

 have united to our plant the P. alpestre of Hoppe and 

 jSchwaegrichen. We must here also declare that, except in the 

 want of the hair-points to the leaves, and their being more 

 scabrous at the extremity, we can find no essential difference 

 between this and the preceding species. 

 P. septentrionale ; leaves lineari-subulate, obtuse, their mar- 

 gins, especially towards the top, involute, subserrulate; cap- 

 sule ovate, subangulate, furnished with a minute apophysis; 

 lid conical, acuminate. (TAB. X.) 



P. septentrionale. Swartz Muse. Suec. t. 9.f. 18. Menzies in Linn. 

 Trans, v. 4. t. 7- f. 5. P. sexangulare. Hoppe. Engl. Bot. t. 1906. 

 P. norvegicum. Hedw. Sp. Muse. t. 22. P. crassisetiun. De Cand. 

 Fl. Fr. 



HAB. Highest summit of Ben Nevis, Scotland. 

 This species has been found in Britain only upon the 

 highest summit of Ben Nevis, in 1808, by Messrs. Turner 

 and Hooker. Although occurring there in tolerable plenty, 

 yet it produced not a single capsule. On the loftiest sum- 

 mits of the Swiss Alps it is far from uncommon, and fructi- 

 fies whilst covered with snow, where scarcely any perfect 

 plant will vegetate. It is a species remarkable in the form 

 of its leaves, which are very obtuse, curled when dry, so 

 convex behind as to be semicylindrical, having their mar- 

 gins, especially at the tops, involute, and there alone slightly 

 serrated. The fruitstalks too are of a succulent, by no means 

 rigid, texture, and much thickened; whence the expressive 

 iiame appropriated to it by De Candolle, and which w^ 



