r.YRMELIA.] PARMEL1EI. 247 



Sra. Eng. Bot. xxix. (1809) t. 2050. Brit. Exs. : Larb. Lich. Hb. 

 n.8. 



Often confounded with smaller states of P. Icemgata, to which it is 

 closely allied, but is distinguished not only by the reaction with K, and 

 the larger spores, but also, and at first sight, by the yellow thallus, which 

 is usually smaller, more divided, and somewhat closely affixed to the 

 substratum. The apothecia are extremely rare in our Islands, and 

 when present are but few and central. 



Hab. On trunks of trees and boulders in maritime upland districts. 

 Distr. .Rather local and very sparingly in S. and W. England, N. Wales, 

 S. and W. Scotland, W. Ireland, and the Channel Islands. B. M. : 

 Island of Guernsey. Bournemouth, Hampshire ; Ullacombe, Devonshire ; 

 Barmouth, Ty Gwn, near Dolgelly, Merionethshire ; Island of Anglesea. 

 Brodrick Castle, Island of Arran ; Appin, Argyleshire ; Glen Nevis, 

 Inverness-shire ; Applecross, Ross-shire. Near Macroone, co. Cork ; 

 Crouiaglown and Dunkerron (fruit), co. Kerry ; Connemara, co. Galway. 



16. P. dissecta Nyl. Flora 1882, p. 451. Subsimilar to P. 

 IfKviyata, but the thallus yellowish, much smaller and thinly-dis- 

 sected, isidiiferous, with short rlminoe on the under surface (me- 

 dulla K(CaCl) + red). Apothecia unknown. Cromb. Grevillea, xv. 

 p. 74. 



This also is closely allied to P. lavigata, to which Nylander (Syn. i. 

 p. 384) originally referred it as a variety. It has been raised by him to 

 specific rank because it constantly preserves its own type. I have not 

 seen a British specimen ; according to Nylander it is not unfrequeut in 

 France. 



Hab. On rocks in (?) upland situations. Distr. Extremely local and 

 rare in Ireland (Jlde Nyl.). 



17. P. conspersa Ach. Meth. (1803) p. 205. Thallus orbicular, 

 expanded, appressed, laciniato-divided, shining, somewhat smooth, 

 greenish-straw coloured ; beneath brown, with short black rhizinae ; 

 laciniae plane sinuato-incised and crenate at the margins 

 ( K i y w; t henrea, CaC1 :). Apothecia moderate, spadiceous or 

 brownish, the margin entire and inflexcd ; spores 0,008-12 mm. 

 long, 0,003-8 mm. thick. Gray, Nat. Arr. i. p. 442 ; Hook. Fl. 

 Scot. ii. p. 55 ; Sm. Eng. Fl. v. p. 199 ; Tayl. in Mack. Fl. Hib. ii. 

 p. 143 ; Mudd, Man. p. 102 ; Cromb. Lich. Brit. p. 34 ; Leight. 

 Lich. Fl. p. 134, ed. 3, p. 124. Lichen conspersus Ehrh. in Ach. 

 Prodr. (1798) p. 118 : Eng. Bot. t. 2097. Lichen centrifugus Huds. 

 Fl. Angl. p. 445 ; Lightf. FL Scot. ii. p. 814 ; With. Arr. ed. 3, iv. 

 p. 32 pro parte. Lichenoides imbricatum viridans, scutellis badiis 

 Dill. Muse. 180, t. 24. f. 75 A. Brit,Exs.: Leight. n. 78; Larb. 

 Caesar, n. 65 ; Cromb. n. 26. 



Often spreads rather extensively, though always preserving an orbi- 

 cular outline. It is occasionally somewhat glaucous, and specimens rarely 

 occur in which the medulla is partly tawny-yellow, the result evidently 



