72 COILEMACEI. [LEPTOGIUM. 



In anatomical structure similar to the preceding species. Externally at 

 once distinguished by the rounded lobes of the thallus, with the margins 

 entire, or occasionally obsoletely and sparingly crenate. The apothecia 

 are usually numerous, and must not be confounded in their younger 

 condition with the sperinogones. 



Hub. Among mosses on old walls and boulders, chiefly in maritime 

 and upland tracts. Distr. General and common where it occurs in most 

 of the hilly tracts of Great Britain ; not seen from Ireland. B. M. : 

 Hoyle Sands, near Penzance, Cornwall; Chew Magna, Somersetshire; 

 near Cirencester, Gloucestershire ; Buxton, Derbyshire ; Garn, Denbigh- 

 shire ; Lake Ogwen and Capel Curig, Carnarvonshire ; High Force Inn, 

 Teesdale, and near Stanhope, Durham ; Whitehaven, Cumberland ; by 

 the Kent, Westmoreland. Appin and island of Lismore, Argyleshire ; 

 Killin, Ben Lawers, and Blair Athole, Perthshire ; Morrone, Braernar, 

 Aberdeenshire. 



Var. /3. sinuatum Malbr. Bull. Soc. Nat. Bouen, 1866, p. 365. 

 Thallus smaller, lobes sinuato-incised, laciniate, crisp, the margins 

 depressed, crenate and denticulate ; otherwise as in the type. Lep- 

 togium sinuatum Mudd, Man. p. 47, pro parte ; Leight. Lieh. Fl. 

 p. 37, pro parte, ed. 3, p. 39, pro parte ; Cromb. Grevillea, xv. p. 13, 

 pro parte. Collema sinuatum Sm. Eng. Fl. v. p. 213 ; Tayl. in 

 Mack. Fl. Hib. ii. p. 110. Lathayrium sinuatum Gray, Nat. Arr. i. 

 p. 400. Lichen sinuatus Huds. Fl. Angl. ed. 2 (1778), p. 535 ; 

 With. Arr. ed. 3, iv. p. 75 ; Eng. Bot. t. 772. Lichen tremelloides y 

 Lightf. Fl. Scot. ii. p. 842. Lichenoides tenue crispum, foliis parvis 

 depressis Dill. Muse. 145, t. 19. f. 33. Brit. Exs.: Mudd, n. 6, 

 pro parte ; Cromb. n. 109, pro parte. 



This has been confounded with the type, though it presents distinctive 

 characters. The smaller thallus, the form of the lobes, and their denti- 

 culato-crenate margins probably entitle it to rank as a subspecies. It is 

 often sterile ; the apothecia are numerous when present. 



Hob. On earth-covered mossy walls and rocks in maritime and upland 

 districts. Distr. Not very general nor common in Great Britain, chielly 

 in the W. ; rare in S. and W. Ireland. B. M. : Caistor, Norfolk ; Stor- 

 rington, Sussex ; near St. Lawrence, Isle of Wight ; Chagford, Devon- 

 shire ; Garn, Denbighshire ; Pentregaer, Oswestry, Shropshire ; Wear- 

 dale and near Stanhope, Durham. Appin, Argyleshire ; Bowling ; Dum- 

 bartonshire ; Killin, Perthshire ; near Forres, Elgin. Blarney, co. Cork ; 

 Dunkerron, co. Kerry. 



Form Polinieri Cromb. Journ. Bot. 1874, p. 336. Thallus pale 

 greenish. Apothecia somewhat scattered ; otherwise as in the type. 

 Leight. Lich. Fl. ed. 3, p. 30. Collema Polinieri Del. ex Nyl. 

 Syn. i. (1858) p. 123. 



Distinguished by the bright green colour of the thallus, which is per- 

 eistent both in a moist and dry condition. The apothecia also are paler 

 and not very numerous. 



Hob. Among mosses on shady walls, rarely on rocks, in upland situa- 

 tions. Distr. Very local and scarce in S. England, N. Wales, the S.W. 

 Highlands of Scotland, and in S. Ireland. B. M. : Henfield, Sussex ; 

 Garn, Denbighshire. Appin, Argyleshire. Blarney, co. CoiTv; Blackwater 

 Bridge, co. Kerry. 



