378 HEPATIC^. 



segments rotundate ; texture lax, delicate, cells smallish, 4-5 and 

 6-sided ; walls reddish, firm, trigones more or less distinct. No 

 stipules. Bracts erect, somewhat similar to the leaves, only 

 larger and longer. Perianth delicate, small, about f the height of 

 the bracts with which it is adnate, mouth laciniate-dentate. Male 

 stems more slender, antheridia terminal or in middle of the stem; 

 perigonial bracts imbricate, turgid; antheridia 1, '1, or 3 at the 

 base of each bract, oval. 



Dimensions. — Stems from 1 to 3 inches long, diam. 'IS mm. 

 to '2 mm., with leaves Vb mm. to 2' mm. wide : leaves 1'75 mm. 

 long X 1-25 mm. broad, segments -5 mm., I'S mm. x 1* mm., 

 seg. '3 mm., '9 mm. x 7 mm., seg. '2 mm.; cells "02 mm. x 

 •02nmi.,-02 mm. x '03 mm.; bracts 2' mm. long x 75 mm. broad ; 

 segments '3 mm.; perigonial bracts r25 mm. long x 1* mm. 

 broad, segments '2 mm. ; antheridia -4 mm. x -3 mm., -3 x -25 

 mm. 



Hab. — Growing in extensive patches in wet situations, by the 

 margin of pools or streams in alpine situations. 



7. Glyder Vawr, G. A. Holt ; Margin of Llyn Bodlyn, Cwm 

 Idwal, W. H. P. 15. Ben MacDhui, G. E. Hunt, JoJm Whitehead; 

 Loch Kandor, G. E. Hunt. 16. Moidart, West Inverness, S. M. 

 Macvicar, 1899. 18c. Uist, ./. Sivi. I. Loch Bray, Lindber^ ; 

 D. McArdle. 



Found on the Continent and in North America. 



Obs. — From all forms <di Marsupella emarginata (Ehrt.) it may 

 be distinguished by its colour and lax texture and the narrow, 

 decurrent base of leaf. 



Marsupella sparsi/olia, Lindb., approaches nearest to small 

 forms of M. sphacelata, but the former is paroicous. 



Description of Plate CLXV. — Fig. 1, 2. Plants natural size. 

 3. Fertile stem x 16 (Glyders, G. A. Holt). 4. Stem x 16 

 (ditto). 5, 6. Leaves x 16 (Ben MacDhui, J. Whitehead). 

 7-9. Ditto X 31 (Glyders, G. A. Holt). 10. Portion of leaf x 

 290 (Ben MacDhui, J. Whitehead). 11. Bracts x 24 (Glyders, 

 G. A. Holt). 12, 13. Perigonial bracts x 16 (Sweden, S. 0. 

 Lindberg). 



