312 LICHENACEI. [PHISCIA. 



variety. — Leight. Lich. Fl. ed, 3, p. 141 ; Cromb. Grevillea, xv. 

 p. 78. 



Miglit be taken for a state of P. ohscura or P. ccssia esorediate, from 

 botb of which it is readily distinguished by the marginal cilia. It is 

 closely allied to the preceding variety, from which it dilfers in the colour 

 of the thallus and of the cilia, and in the almost entire absence of rhizinse 

 on the under surface. In the few British specimens there are no apo- 

 thecia. 



Hah. On rocks in maritime districts. — Distr. Only in the Channel 

 Islands, the S.W. Highlands of Scotland, and N.W. Ireland ; no doubt 

 to be detected elsewhere. — B. M. : La Moye, Island of Jersey. Barcal- 

 dine, Argyleshire. Leenane, co. Galway. 



Subsp. 1. P. tenella Nyl. Flora, 1874, p. 306. — Thallus subeifuse, 

 narrowly laciniate ; laciuiae ascending, usually tubuloso-inflated or 

 fornicate at the apices, white fibrillosn-ciliate at the margins. 

 Apothecia small or moderate, the margin entire or crenulate. — 

 Cromb. Grevillea, xv. p. 78. — Physcia stellaris var. tenella Cromb. 

 Lich. Brit. p. 39 : Leight. Lich. Fl. p. 151, ed. 3, p. 141. Bo.-rera 

 hispida /3. tenella Mudd, Man. p. 106. Parmelia U-nella Tayl. in 

 Mack. Fl. Hib. ii. p. 147. Borrera tenella Gray, 'Nat. Arr. i. p. 431 ; 

 Hook. Fl. Scot. ii. p. 56 ; Sm. Eng. Fl. v. p. 222. Lichen tenellus 

 Scop. Fl. Carn. (1760) p. 1406 ; Eng. Bot. t. 1351 ; With. Arr. 

 ed. 3, iv, p. 56. Lichen ciliaris /3. Huds. Fl. Augl. ed. 2, p. 538 ; 

 Lightf. Fl. Scot. ii. p. 828. Lichenoides' hisjiidum minus et teneriiis, 

 scutellis nif/ris Dill. Muse. 152, t. 20. f. 46, c, lE.—Brit. Exs. : 

 Leight. n. 174; Mudd, n. 78; Cromb. n. 151; Larb. Lich. Hb. 

 n. 330 ; Bohl. n. 20. 



Looks at first sight as if it were a distinct species. It is readily recog- 

 nized by the hooded-like apices of the ascendant laciniae, though these 

 finally become sorediate. The thallus and the marginal cilia, which are 

 either simple or variously divided, often become darker-coloured in age, 

 or when growing in dry exposed places. The apothecia are not unfre- 

 quent, and the spermogones are often numerous. 



Hnh. On the trunks and branches of trees, old walls, and occasionally 

 boulders in maritime and upland districts. — Distr. General and common 

 in Great Britain ; apparently rare in Ireland and the Channel Islands. — 

 B. M. : La Moye, Island of Jersey ; Island of Guernsey. Earsham, Nor- 

 folk ; Bury St. Edmunds, Suffolk ; Walthamstow, Essex; Shanklin, Isle 

 of Wight ; Plymouth, Devonshire ; near Penzance and Withiel, Corn- 

 wall ; near Cirencester, Gloucestershire ; Twycross, Leicestershire ; Grims- 

 bury Green, Northamptonshire ; Buxton, Matlock, and Barley, Derby- 

 shire ; Herefordshire 13eacon and Malvern, Worcestershire ; Ilaughmond 

 Hill, Shropshire ; Tenby, Pembrokeshire ; near Usk, Monmoutlishire ; 

 Dolgelly and Llyn Bodlyu, Merionethshire ; Island of Anglesea ; near 

 Stokeslev and Kiklale, Cleveland ; Croft Head, Westmoreland ; Holy 

 Island, Northumberland; near Asby, CUimberland. Swanston Wood, 

 near Edinburgh ; Appin, Argyleshire ; Killin and Ben Lawers, Perth- 

 shire ; Montrose, Forfarshire ; Castleton of Braemar, Aberdeenshire. 

 Carrigaloe, co. Cork ; Dromorelaud, co. Clare. 



