PURELLA. ^\ 



ciliolate ; bracteulc broadly ovate, ciliolatc. Perianth cuneate, 

 mouth very wide, irreguhir, ciliohite, cilioUi beiiij^ about 4 cells 

 long-. Pistillidia very large. 



Dlmensions. — Stems 'I to ;3 inches long, '4 mm. to '5 mm. in 

 diameter, with leaves 3" mm. wide; antical lobe :^"5 mm. x I 75 

 ram., l2 mm. x I '5 mm., p»>stical M mm. x "4 mm., V^l'^> mm. x 

 "5 mm., Lli mm. x o mm. ; branch leaves, antical lobe TG mm. x 

 1-25 mm., 175 mm. x I '1^5 mm., postical '7 mm. x "I'l mm. ; cells 

 •02 mm., '0225 mm. x '02 mm., 0225 mm. x -0225 mm. ; stipules, 

 r25 mm. x "75 mm., L* nun. x 'J mm.; sub-bract, antical lobe 

 2'4 mm. x I'o mm., postical 135 mm. x 7 mm. ; sub-bracteole I "25 

 mm. X 7 mm.; bract, antical lobe 'o mm. x 175 mm., i)Ostical 

 175 mm. xrmm. : bracteole 2*25 mm. x 2* mm.; perianths* 

 mm. X 3'5 at the mouth; teeth at mouth of perianth "05 

 mm. -"075 mm. ; pistillidia "o mm. x 'i uim. 



Hab. — On trunks ot" trees (especially at the base), stones or 

 rocks. Rare. 1 ? 5. Gt. Do ward Hill, Hereford, B. M. Walkiii'^. 

 7. Barmouth, ILoU and Wild. Tyn-y-groes, //: 11. P. 10. Nr. 

 Dent, //^. litest. 12. Borrowdale, Cumberland, JJr. Carriuf/lu/t 

 and W. II. P. 13. Frequent in subalpine glens, Dumiries, 

 Cndckskank, Scott., 15. IG. Moidart, West Inverness, S^incris 

 M. Macvicar. I. 



Found on the Continent. 



Obs. — Distinguished from other Pordlcc b}' its polished 

 leaves, with antical lobes acute or acun)inate, postical ciliate 

 dentate, margin of bracts finely ciliolate, perianth short, but 

 very wide at the mouth. Plants bearing perianths have, I 

 believe, only been once tbund, by Prof. Henriques in Portugal ; 

 the male plant has never been met with. This plant has the 

 singular character (which was first noticed by Prof. Lindberg), of 

 producing a burning sensation in the mouth when chewed. 



Description of Pl.\te XXVIII. — Fig. 1. Plant natural size. 

 1. Portion of branch, antical view x 11 (C. k P. n. 45). 

 3. Portion of stem, postical view x IG (ditto). 4. Leaf, postical 

 view X 1 I (ditto). 5. Postical lobe or lobule x IG (ditto). 

 6. Portion of leaf x 2'.)0 (ditto). 7. Stipule x 24 (ditto). 



F 



