310 LICHEXACEI. [PHYSCIA 



Hah. Among mosses on rocks in snbalpino regions. — Distr. Only very 

 sparingly in W. England and the S. Grampians, Scotland. — B. M. : 

 North Hill, Malvern, Worcestershire. Ben Lawer.Sj Perthshire. 



12. P. aquila Xyl. Act. See. Linn. Bord. ser. 3, i. (1856) p. 309. 

 — Thallus suborbicular, appressed, narrowly laciniate, chestnnt- 

 browu ; beueath pale and sparingly blackish-fibrillose ; laeiuia; multi- 

 partite, somewhat convex, explanate at the circumference, imbri- 



cato-congested (K~, CaCl~), Apotbecia adnate, moderate, eon- 

 cave or somewhat plane, brownisb-black, the margin tumid, sub- 

 crenatc ; spores 0,030-44 mm. long, 0,018-25 mm. thick. — Cromb. 

 Lich. Brit. p. 39 ; Leight. Licb. Fl. p. 153, ed. 3, p. \A2.— Bon-era 

 aquila, Mudd, Man. p. 111. Parmelia aquila Gray, Xat. Arr. i, 

 p. 441 ; Hook. Fl. Scot. ii. p. 54 ; Sm. Eng. Fl. v. p. 203 ; Tayl. in 

 Mack. Fl. Hib. ii. p. 143. Lichen aqidlus Acb. Prodr. (1798) 

 p. 109 ; Eng. Bot. t. 982. Lichen jmllus Lightf. Fl. Scot. ii. p. 825. 

 Lichen fuscus Huds. Fl. Angl. ed. 2, p. 533. Lichen obscunw With. 

 Arr. ed. 3, iv. p. 28. Lichenoides angustifolium fuscum, scutellis 

 j)i(llis DiU. Muse. 175, t. 24. f. G9.— Brit. £:rs. :' Leight. u. 1-14; 

 Larb. Cjesar. n. 23; Dicks. Hort. Sic. 25 ; Bohl. n. 111. 



Easily recognized by its chestnut-brown, narrowly laciniate thallus, 

 and by its saxicolous habitat. The thallus, of which the cortical layer 

 presents intricate tubulose cavities, is sometimes widely expanded, in 

 which case in old plants it occasionally becomes zonately centrifugal. 

 States occasionally occur with us passing into var. sfippea (Acb.), but not 

 sufbcieutly tvpical. The apotbecia are common, sometimes very nume- 

 rous and crowded, with the spores often thicker at one or the other apex. 

 The spermogones also are not unfrequent. 



Sab. On rocks in maritime districts, rarely on hills at some distance 

 from the sea in upland tracts. — Disfr. General and not uncommon on 

 most of the rocky coasts of Great Britain, Ireland, and the Channel 

 Islands : very abundant on the coast of Kincardineshire in N.E. Scotland. 



B. M. : Petit Port, Island of Jersey ; Island of Guernsey. Near 



Chiche.-^ter, Sussex ; Torquay, Bolt Head, Hay Tor, Dai-tmoor, and near 

 Okehanipton. Devonshire ; 'remple Moor, Stoneyford, Penzance, The 

 Lizard, lioche rocks, and Helmiuton, Cornwall ; "Mynydd-y-Myfyr, near 

 Oswestrv, Shropshire ; near Tenby, Pembrokeshire ; Barmt)ut1i and 

 Harlech" Castle, Merionethshire; Llanberis, Carnarvonshire; Holyhead, 

 Island of Anglesea : Douglas Head, Isle of Man ; Holy Island, North- 

 umberland ; Barrowniouth, Cumberland. New Galloway, Kirkcudbright- 

 shire ; King's Park and Turtin Hill, near Edinburgh ; Barcaldiue, Argvle- 

 shire ; Portletheu, Kincardineshire ; near Peterhead, Aberdeenshire. 

 Ballycotton and Mizen Head, co. Cork ; Kenmare Pdver, co. Kerry ; 

 Connemara, co. Galway ; Ardglass, co. Down. 



13. P. stellaris Nyl. Flora, 1870, p. 38. — Thallus orbicular, 

 stellari-appressed, multifido-laciniate, white, greyish or glaucous- 

 white ; beneath whitish, with greyish fibrillose rhizina) ; laciniai sub- 

 linear, convex, contiguous (K+y^^°"'' CaCl~). Apotbecia submode- 



