194 HEPATICjE. 



1-3 mm. X '9 mm., 1-mm. x '8 mm., seg. '3 mm. ; bracteole 1* mm. 

 X -55 mm. ; perianth 4' mm. x 'T-'So mm. ; pedicel 10-15-mm. ; 

 capsule -8 mm. x "5 mm., valve 7 mm. x '275 mm. ; spores 

 •0125 mm. diam. ; elaters •2--25 mm. x '0125 mm. 



Hab. — On damp earth in alpine localities, rare. 



15. Clova, R. K. GrcvUle. Ben Mac Dlmi, G. E. Hunt, Thomas 

 Rogers, G. Sf abler. Ben Lawers, G. E. Hirnt. Head of Loch Avon, 

 A. Croall. 16. Ben Nevis, R. K. GrevUle. 



Found on the Continent and in North America. 



Obs. — A very distinct species, and only found near the tops of 

 the highest Scotch mountains ; from any of the CepJialoziiB dis- 

 tinguished at once by the lateral branches ; from P. islandica 

 (Nees), see notes under that species. 



Description of Plate LXXV. — Fig. 1. Plants natural size. 



2. Portion of stem, antical view x 16 (Clova, K. K. Greville). 



3. Ditto, postical view x 24 (ditto). 4, 5. Leaves x 64 (Grimsel, 

 G-. E. Davies). 6. Portion of leaf x 290 (Clova, Greville). 7. 

 Stipule X 64 (Grimsel, Davies). 8. Ditto x 85 (Clova, Greville). 

 9. 3rd sub-bract x 24 (Lapland, Angstrom). 10. 2nd sub-bract 



x 24 (ditto). 11. Sub-bracteole x 24 (ditto). 12, 13. Bracts 

 x 24 (ditto). 14. Bracteole x 24 (ditto). 15. Perianth x ? 

 (G. & B. Hep. Eur. n. 468, drawn by Dr. Gottsche). 



2. Pleuroclada islandica [Nees). 



Jungermania islaiidica, Nees Nat. Eur. Leb. 11, p. 29 (1836). 

 Cephalozia islandica, Lindb. in Journ. Linn. Soc. xiii. p. 192 (1873). 

 Pleuroclada alhescens, var. islandica, Spruce, On Cephalozia, p. 79 (1882). 



Dioicous, csespitose, tufts depressed, eflagelliferous, small, pale 

 green in colour, when dry with a bluish-white tinge. Stems 

 simple or slightly branched, oval-terete, cortical cells about 20, 

 similar to the inner, S cells in diameter ; radiculose, rootlets few, 

 white ; branches lateral. Leaves imbricate, near the apex of stem 

 approximate or somewhat distant below, patent to erecto-patent 

 (40^^), orbicular, complicate-concave, bifid to the middle or below, 

 sinus obtuse, segments broadly lanceolate or triangular, acute, 



