78 CYCLOCARPINEE [LEPTOGIUM 
Forest, Hants; Studland, near Swanage, Dorset; Hale End, Epping 
Forest, Essex; Dundey, Somerset; Machynlleth, Merioneth; near 
Malvern, Worcestershire ; Warsigutht Norfolk; near Ayton, Cleveland, 
Yorkshire ; near Killin, Perthshire ; Luggelaw, Wicklow. 
22. L. tremelloides 8S. F. Gray Nat. Arr. i. p. 400 (1821).— 
Thallus lobed, thin, somewhat smooth or covered with isidia, the 
lobes oblong, imbricate, often crisp, with entire margins, dull 
olive-green, or, usually, glaucous leaden-coloured. Apothecia 
rare, moderate in size, concave, becoming plane, reddish with a 
paler thick entire margin; spores ovoid or broadly fusiform, 
3-septate and muriform, "21-27 p long, 8-9 p» thick.—Mudd Man. 
p. 48; Cromb. Lich. Brit. p. 8; Leight. Lich. Fl. p. 28; ed. 3, 
p- 31 (incl. f. polyphyllum Nyl.; Gromb. Monogr. i. P. 74). 
Lichen tremelloides Linn, fil. Suppl. Pl. Syst. p. °450 (1781) ; 
Engl. Bot. t. 1981. LZ. cochleatus Dicks. Pl. Crypt. fase. 1. 
p. 13, t. 2, fig. 9 (1785); With. Arr. ed. 3, iv. p. 74. Collema 
ulin Ach. Lich. Univ. p. 655 (1810) ; Hook. Fl. Scot. li. 
p. 72 & in Sm. Engl. Fi. v. p. I13 : Tayl. in Mackay Fl. Hib. ii. 
p. i var. pichneum Ach. Syn. ‘Lich. p. 343 (1814) ; Cromb. 
in Grevillea xv. p. 13 (1886). 
Exsice. Cromb. n. 110 ; Larb. Lich. Cesar. n. 5. 
Differs from the two preceding species in the almost constant 
leaden colour, the large thin entire lobes, and the large apothecia. 
The lobes are occasionally rather smaller (f. polyphyllwm), or some 
of the lobes may be densely isidiose (f. pichnewm). 
Hab. Among mosses on moist rocks in maritime and mountainous 
districts. —Distr. General and usually plentiful in the Channel Islands, 
S. and W. Britain and E. and 8.W. Ireland.—B. M. Guernsey ; 
St. Peter’s Valley, Jersey; St. Lawrence, I. of Wight; St. Issey, near 
Penzance and Saltash, Cornwall; Totnes, near Ditsham, Wembury, 
Cornworthy, Haberton, near Brixham and near Torquay, Devon; 
Tenby, Pembrokeshire; Barmouth and Harlech Castle, Merioneth- 
shire ; Garn, Denbighshire ; Llanberis Pass, Carnarvonshire ; Anglesea ; 
Dumbarton Castle; Loch Creran and Barcaldine, Appin, and I. of 
Mull, Argyll; Dunkerron Mt., Blackwater and Killarney, Kerry; near 
Kylemore, Connemara, Galway. 
23. L. ruginosum Nyl. ex Cromb. in Greyillea xv. p. 13 
(1886).—Thallus of round rather thin large lobes, plicate, undu- 
late and crowded, with numerous longitudinal wrinkles, and 
often furfuraceous with concolorous or slightly darker isidia, the 
margins of the lobes entire or crenulate, brownish- or greenish- 
leaden coloured. Apothecia rare, rather large, slightly concave 
or plane, red or brownish-red, the margin thick, wrinkled, plicate 
or granular; spores ellipsoid or broadly fusiform, 3—5-septate 
and sometimes muriform, 20-37 p long, 10-17 p thick.—L. ehloro- 
melum Mudd Man. p. 48 (1861) (non Nyl.); Carroll in Journ. 
Bot. v. p. 254 (1867); Cromb. Lich. Brit. p. 9; Leight. Lich. 
Fl. p. 382; ed. 3, p. 32. Collema ruginosum Duf, ex Scher. Enum. 
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