88 HEFATJCJE. 



X 1*5 mm., 2- mm. x I'G mm., 2'1 mm. x I'G mm., I'S mm. x 

 1*7 mm., VI mm. x 1*4 mm., 1"75 mm. x 1'5 mm., postical 

 •75 mm. x '4 mm., "7 mm. x '35 mm., "9 mm. x '5 mm. ; cells 

 •035 mm. x -03 mm., -035 mm. x '025 mm., '035 mm. x '035 mm. ; 

 trigones '0017 mm.; stipules "75 mm. x -6 mm., "75 mm. x 

 •75 mm. ; bract, antical lobe -8 mm. x '4 mm., postical '5 mm. x 

 25 mm. ; bracteole 7 mm. x -45 mm. ; perianth 4*5 mm. x 1-75 mm.; 

 pistillidia '3 mm. x 075 mm.; capsule 1"2 mm. x -9 mm. ; peri- 

 gonial bracts, antical lobe I'l mm. x '6 mm., postical '85 mm. x 

 •4 mm., antical 1- mm. x '55 mm., postical "55 mm. x 3 mm.; 

 perigonial bracteole '5 mm. x 3 mm.; antheridia "14 ram. x 

 "11 mm. 



Hab. — On stones in rivers, or on rocks and trees by their side. 

 Somewhat rare, and extremely so in fruit. 



1? 7? 10. On limestone rocks at edge of stream, Malham, 

 W. JFe^f. On rocks near Collingham, W. Yorks, IF. West. 



12. Staveley, Westmorland, G. Sf abler. High Lorton, Cumber- 

 land, Bev. C. H. Bivsfead. Ullswater, Cumberland, E. M. Holmes. 



13. Near Kenmure Castle, New Galloway, ./. Mc Andrew. Balmac- 

 lennan, Dumfries, ./. McAndrew. On trees and rocks, Newtondon, 

 Berwickshire, A. Brollierston. 



I. On trees near River Lagan, Co. Down, Bev. C. H. 

 Waddell. Continent. 



Obs.— Differs from B. plaiyphylla (L.) in its looser habit, more 

 distant leaves, planer, rather more dentate, smaller, narrower nnd 

 more contorted lobule, thinner texture, larger and distinct trigones, 

 smaller and more irregular stipules, smaller bracts, margin entire, 

 perianth with contracted mouth. 



Borella pmnafa (D.) is a much more slender species, with 

 more distant leaves, much smaller lobules and stipules, margins 

 of which are all quite entire. 



Description op Plate XXXI. — Fig. 1. Plant natural size. 

 2. Portion of stem, antical view X 1 1 (C. and P. n.). 3. Ditto, 

 postical view X 1 1 (ditto). 4,5. Leaves x IG (ditto). G. Lobule 

 X 24 (ditto). 7. Portion of leaf x 290 (ditto). 8. Stipule x 24 

 (ditto). 9. Bract X 24 (Sweden, S. O. Lindberg). 10. Bracteole 



