70 COLLEMACEI. [lEPTOGIUM. 



p. 47 ; Cromb. Lich. Brit. p. 8 ; Leight. Lich. Fl. p. 32, ed. 3, p. 28. 

 Collemal acerum Hook. Fl. Scot. ii. p. 72 ; Sm. Eng. Fl. v. p. 213 ; 

 Tayl. iu Mack. Fl. Hib. ii. p. 111. Lichen lacerus Sw. in Ach. 

 Prodr. (1798) p. 113. Lichen lacer Eng. Bot. t. 1982. Lichen tre- 

 mella With. Air. ed. 3, iv. p. 72. Lichen tremelloides Lightf. Fl. 

 Scot. ii. p. 842 ; Huds. Fl. Angl. ed. 2, p. 537. Lichenoides pellu- 

 cidum, endivice foliis tenuibus Crispin Dill. Muse. 143, t. 19. f. 31 A, B. 

 Lichenoides saxatile tenue rufescens Dill, in Ray, Syn. ed. 3, 77. 89. 

 Brit. Exs. : Mudd, n. 5, pro parte ; Larb. Caesar, n. 4. 



Easily recognized by the thallus and lacinise. The thallus is more or 

 less effuse, often interrupted by fresh growths of the living mosses upon 

 which it is developed ; in a moist condition it is very delicate and sub- 

 pellucid. The apothecia, which are rather rare in British specimens, are 

 sparingly and irregularly scattered. 



Hab. Among mosses on the ground and old walls in shady places in 

 maritime and upland districts. Distr. Pretty general, but not very 

 common, in the Channel Islands and most parts of Great Britain and 

 Ireland. B. M. : Quenvais, Island of Jersey. Near Cambridge ; Khiere, 

 Surrey ; Ventnor, Isle of Wight ; Buckfastleigh and Morleigh, Devon- 

 shire ; Penzance and near Withiel, Cornwall ; Cheddar Cliffs, Somerset- 

 shire ; near Cirencester, Gloucestershire ; Seddingtou, Bedfordshire ; 

 Charnwood Forest, Leicestershire ; Broadwas and Aliric, Worcestershire ; 

 Garn Dingle, Denbighshire ; Cotteral Clough, Lancashire ; near Kendal, 

 Westmoreland ; Mulgrave Castle, Cleveland, Yorkshire ; Keswick, Cum- 

 berland. Near Moffat, Dumfriesshire; Barcaldine, Argyleshire ; Killin 

 and the Ochills, Perthshire ; Glen Dole, Forfarshire ; Corriemulzie, 

 Braemar, Aberdeenshire ; Lochaber, Inverness-shire. Blarney and Kil- 

 worth, co. Cork; Killarney and Dingle Bay, co. Kerry ; Connemara, co. 

 Galway. 



Form fimbriatum Nyl. Syn. i. (1858) p. 122. Thallus larger; 

 laciniae broader, densely fimbriate and ciliate at the margins, the 

 ciliae very much branched. Apothecia much scattered. Cromb. 

 Journ. Bot. 1874, p. 335; Leight. Lich. Fl. Suppl. p. 468, cd. 2, 

 p. 28. Collema fimbriatum Hoffm. Deutsch. Fl. (1795) p. 104. 

 Lichenoides pelluciduw, endiviw foliis tenuibus crispis Dill. Muse. 

 143, t. 19. f. 31 c.Brit. Exs. : Cromb. n. 108 ; Mudd, n. 5, pro 

 parte. 



From the type this differs chiefly in the densely fimbriato-ciliate 

 margins of the lacinise, though both states occasionally occur in the same 

 specimen. With us, as elsewhere, it is rarely seen fertile. 



Hab. Among mosses on rocks and old walls, chiefly in upland tracts. 

 Distr. Seen only in S., W., and N. England, in S. Scotland, and the 

 W. Highlands B. M. : Luccombe, Isle of Wight ; near Totness and 

 Tavistpck, Devonshire ; Cheddar Cliffs, Somersetshire ; Chalford and 

 near Cirencester, Gloucestershire ; Broadwas, Worcestershire; Barmouth, 

 Merionethshire ; Cleveland, Yorkshire. New Galloway, Kirkcudbright- 

 shire; Barcaldine and Inverary, Argyleshire ; Killin, Perthshire; S. of 

 Fort William, Inverness-shire. 



Subsp. 1. L. pulvinatum Nyl. Flora, 1878, p. 345. Thallus small, 

 pulvinate, dark-brown : lobes minute, much crowded, dcnticulato- 



