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. 218; 
Tayl. in 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. Arr. ed. 3, iv. p. 72. Lichen tremelloides Lighttf. Fl. 
Scot. ii. p. 842; Huds. Fl. Angl. ed. 2, p. 537. Lichenoides pellu- 
cidum, endivie folizs tenuibus crispis Dill. Muse. 148, t. 19. f.31 a, B. 
Lichenoides saxatile tenue rufescens Dill. in Ray, Syn. ed. 3, 77. 89. 
—Brit. Exvs.: Mudd, n. 5, pro parte; Larb. Cesar. n. 4. 
Easily recognized by the thallus and laciniz. The thallus is more or 
less effuse, often interrupted by fresh growths of the living musses 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—Dzstr, 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; Shiere, 
Surrey ; Ventnor, Isle of Wight; Buckfastleigh and Morleigh, Devon- 
shire ; Penzance and near Withiel, Cornwall; Cheddar Clitis, Somerset- 
shire; near Cirencester, Gloucestershire; Seddington, Bedfordshire ; 
Charnwood Forest, Leicestershire ; Broadwas and Allric, 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 ; 
laciniz broader, densely fimbriate and ciliate at the margins, the 
ciliz very much branched. Apothecia much scattered.—Cromb. 
Journ. Bot. 1874, p. 335; Leight. Lich. Fl. Suppl. p. 468, ed. 2, 
p. 28.—Collema jfimbriatum Hoffm. Deutsch. Fl. (1795) p. 104. 
Lichenoides pellucidum, endiviw foliis tenuibus crispis Dill. Musc. 
148, t. 19. f. 81 c.—Brit. Evs.: Cromb. n. 108; Mudd, n. 5, pro 
parte. 
From the type this differs chiefly in the densely fimbriato-ciliate 
margins of the laciniz, 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 8., W., and N. England, in S. Scotland, and the 
W. Highlands.—B. M.: Luccombe, Isle of Wight; near Totness and 
Tavistock, 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, denticulato- 
