Parmelia.] LICHENES. 147 



On ash and elm at Dunkerron, County of Kerry ; frequent. There 

 is a minute state of P. uivthrix, growing- on the same trees with the 

 present, and easily confounded with it. In P. adglutinata, however, the 

 edges of the lobes are more wide, far more thin, and, as it were, pasted 

 to the bark of the tree on which it grows ; the thallus too is less deeply 

 divided. The buds originating in round ruptures of the thallus, soon 

 become confluent, run along the tops of the ridges that separate the 

 lobes, and form on the central and greater portion of the frond a flat- 

 tish, rimose cushion, of coarse brownish-grey powder. 



21. P. casia, ACH. Thallus stellate, greyish- white ; the la- 

 cinice linear, convex, inciso-multifid ; buds scattered in hemis- 

 pherical, grey eruptions ; apothecia with a thick, nearly entire 

 border. Ach. L. Un. p. 479. Eng. Bot. t. 1052. 



On rocks, very common in the County of Kerry. The buds are 

 rarely confluent. The united patch of several fronds, sometimes a foot 

 or more in diameter. 



22. P. Clementiana, ACH. Thallus stellate, mealy, white, 

 beneath pale, with blackish fibres ; lacinice flat, incised, crenate; 

 buds in cup-shaped eruptions; apothecia flattish, with the border 

 nearly entire. Ach. L. Un. p. 483. L. dementi, Eng. Bot. t. 

 1779- 



On rocks at Blackwater bridge, County of Kerry. I have never 

 seen apothecia on Irish specimens. The patches are usually small, 

 scattered, conspicuously white. 



23. P. tenella, ACH. METH. Thallus substellate, whitish- 

 grey ; the segments linear, subpinnatifid, ascending, dilated, 

 vaulted and ciliated at the ends ; buds in cup-shaped eruptions ; 

 apothecia substipitate. Ach. Meth. Lich. p. 250. Borrera tenella, 

 Lich. Un.p. 498. Eng. Bot. t. 1351. 



On trees, furze, heath, and stones ; common. A variety found by 

 Mr. G. S. Gough at Rathronane, County of Tipperary, is so interme- 

 diate between this an P. ciliaris (Borrera of authors) that 1 know not 

 to which to refer it. The variety y. excmpta, Ach. L. Un. p. 499, oc- 

 curs on Scotch fir at the Dargle. In this all the characters that dis- 

 tinguish Borrera, Ach. from his Parmelia, vanish ; the ladnice of the 

 thallus are broad, flat, by no means " canaliculate beneath," nor are the 

 cilia to be observed, except here and there, and in this case only with 

 a lens ; the buds are in curved, linear clusters and situated imme- 

 diately below the margins of the terminating lacinice. I am persuaded 

 future observation will prove it to be a distinct species. 



24. P. flavicans, ACH. METH. Thallus erect, branched, 

 tufted, tawney -yellow ; the segments dichotomous, flexuose, 

 attenuated ; buds in cup-shaped eruptions ; " apothecia sub- 

 marginal." Ach. Meth. Lich. p. 268. Borrera jlavicans, Ach. 

 L. Un. p. 504. Eng. Bot. t. 2113. 



On rocks and stones, near Waterford, Dr. F. Barker. Dublin 

 mountains and Killiney Hill, near Dublin. The northern limit of this 

 Lichen is much higher than generally supposed. Acharius had it from 

 Jamaica, St. Domingo and Peru. 



