198 LICUEXACEI. [liAMALTNA. 



is merely an acciilentnl state of this species. — Brit. Exs. : Leight. 



n. 



This dirtei's from li. scopulorum chiefly in the absence of any chemical 

 reaction of the medulla. The thallus is variable in size and in the 

 character of the laciniaj, and is often roughish with spermogoniiferous 

 pustules. The apothecia, except iu the occasionally striatulate receptacle 

 and the size of the spores, are, as well as the spermogones, similar to 

 those of H. scopiilanan, though often congested and difform. 



Ilab. On rocks and boulders in maritime districts, rarely on hills at a 

 distance from the sea. — Disfr. General and abundant on all the rocky 

 coasts of Great Britain, the Channel Islands, and probably also of Ire- 

 land. — B. M. : Island of Guernsey. Leigh Tor, Dartmoor, near Ply- 

 mouth, Wembridge, and Torquay^ Devonshire; Land's End, Tintagel, 

 the Lizard, Lamorna, St. Breock, and Pentire, Cornwall ; Tenby, Pem- 

 brokeshire ; Aberdovey and Dolgelly, ^Merionethshire ; South Stacks, 

 Island of Anglesea ; Pwllheli, Carnarvonshire ; Holy Island, Northumber- 

 land ; St. Be'es, Cumberland. Solway Firth, Kirkcudbiightshire ; Rivel- 

 stou and Ciamond Island, near Edinburgh ; Innerkip, Renfrewshire ; 

 B inks of the Tay and Turin Hill, Forfarshire ; Kiunoul Hill,_Perthshire ; 

 I'ortlethen, Kincardineshire; near Peterhead, Aberdeenshire. Great 

 Island, Cork ; Ardglass, co. Down. 



Form minor jSTjI. Bull. Soc. Linn. Xormand. ser. 2, iv. (1870) 

 p. 159. — Thallus small, erect; lacinioe simplish, slender, subulate. 

 Apothecia small, terminal or subterminal. — Cromb. Grevillea, vii. 

 p. 141. 



A much dwarfed condition, being only l in. to 1 in. in height, with the 

 lacinias often black at the apices. The apothecia are small and usually 

 numerous. 



Hab. On dry exposed rocks in maritime tracts. — Bisfr. Local, though 

 plentiful where it occurs in the Channel Islands, S. and W. England, and 

 in N.E. Scotland ; probably to be detected elsewhere, — B. M. : The Vale, 

 Island of Guernsey. "VVembury, Devonshire; Fowey and near Penzance, 

 Cornwall; Tenby,' Pembrokeshire; Aberystwith, Cardiganshire; St. Bees, 

 Cumberland. Portlethen, Kincardineshire. 



Tar. ft. crassa Del. ex Nyl. BuU. Soc. Liuu. Xormand. sc'r. 2, iv. 

 (187U) p. 159.- — Thallus somewhat small, thick, subopaque, tuber- 

 culoso-diiform, rigid, shortly laoiniate ; laciuise dilated, s])aringly 

 divided (mcdtilla K-- ). Apothecia chiefly terminal. — Cromb. Journ. 

 Bot. 1874, p. 147 ; Leight. Lich. Fl. ed. 3, p. 90. 



Analogous to var. incrasaata of li. sropuhnim, from which it differs in 

 the absence of any chemical reaction of the medulla. The thallus is 

 .'-ometimes terebrate iu old plants. Our British specimens are rarely 

 fertile. 



Ildb. On rocks and boulders in maritime tracts. — Distr. Local and 

 scarce in the Channel Islands, S. and N. England, and in N.E. Scotland. — 

 B. M. : lia Moye, Island of Jersey. Near Penzance, Cornwall; St. Bees, 

 Cumberland. "Portlethen, Kincardineshire. 



Subsp. R. breviusciila Xyl. Flora, 1873, p. 00. — Thallus small, 

 depressed, firm, often subpulvinalo-stipatc : laciuisc short, congested, 



