332 LICHENACEI. [G@YRoPHORA. 
Bot. t. 1282. Lichenoides tenue pullum, foliis utrinque glubris Dill. 
Muse, 225, t. 30. f.129.—Brit. Huvs.: Leight. n. 313; Mudd, n. 87; 
Larb. Lich. Hb. n. 331. 
A rather variable plant in its manner of growth, whence different states 
have been regarded by authors as more or less distinct varieties. In 
nature, it is originally monophyllous, consisting of a single small peltate 
leaf (form monophylla Turn. & Borr. l.c.; Leight. @. ce.), which subse- 
quently becomes more or less lobed and polyphyllous. Sometimes the 
lobes become deeply divided and lacerate at-the margins (form Jacera 
Leight. Lich. FL. p. 156, iii. p. 144; Mudd, Man. p. 116; Cromb. Enum. 
p.41). At other times the upper surface is occasionally marked by a few 
undulating cracks with black interstices (form suleata Turn. & Borr. J. ¢.; 
Leight. Lich. Fl. di. cc). Both of these, however, are but mere states, 
and may be seen in tke same specimen, so that they are not entitled to 
be regarded as distinct forms. The apothecia seem to be extremely rare 
in Great Britain. 
Hab. On rocks, boulders, and walls in upland and subalpine districts. 
— Distr. General and not uncommon in the mountainous regions of Great 
‘Britain; apparently rare in those of I, Ireland—B.M.: Daitmooy, 
Devonshire; near St. Clear, Cornwall; Charnwood Forest, Leicester- 
shire; Cader Idris, Cellfawr, near Barmouth, Merionethshire ; Carnedd 
Liewelyn, Carnarvonshire; Ingleby and Battersby Moors, Cleveland, 
Yorkshire; between Hyshope and Wasterly, Durham; Kentmere, West- 
_. noreland; near Wallington, Northumberland. New Galloway, Kirkcud- 
brightshire; Ben Lomond, Stirlingshire; Ben Lawers, near Tummel 
Bridge, and Craig-y-Barns, Dunkeld, Perthshire; Sidlaw Hills, Clova 
Mts., and Cortachy, Forfarshire ; Craig Coinnoch, Glen Callater, Morrone, 
and Lochnagar, Braemar, Aberdeenshire; Ben Nevis, Inverness-shire. 
Luggelaw, co. Wicklow. 
Form 1. glabra Nyl. ew Stiz. St. Gall. Nat. Ges. 1876, p. 212.— 
Thallus larger, monophyllous, somewhat firm, slightly rugulose, the 
margin undulate and unequally inciso-lobed.—Gyrophora glabra 
Gray, Nat. Arr. i. p. 476; Hook. FI. Scot. ii. p. 41. Lichen glaber 
Ach. Prodr. (1798) p. 144 pro parte. Lichen anthracinus Dicks. 
Crypt. fase. iti. p. 19; With, Nat. Arr, ed. 3, iv. p. 63. 
Differs in the rather thicker, less smooth, and larger thallus (2-3 in. 
broad), which is not polyphyllous, though more or less lobed at the cir- 
cumference. Elsewhere the normally brownish-black colour of the thallus 
merges into greyish (leaden-black), but this is not visible in our few 
British specimens. With us it is always sterile. 
Hab. On rocks and boulders in upland mountainous districts——Dzstr. 
Seen only sparingly among the Grampians, Scotland, and in E, Ireland; 
no doubt to be detected elsewhere.—B. M.: Ben Lawers, Perthshire; 
Loch Callater, Braemar, Aberdeenshire. Lough Bray, near Dublin. 
Form 2. congregata Turn. & Borr. Lich. Br. (1839) p. 214.— 
Thallus very small, the lobes clustered and curled, with the margins 
erect or reflexed, entire or lacerate——Cromb. Grevillea xv. p. 79.— 
Umbilicaria polyphylla form congregata Leight. Lich. Fl. p. 156, 
ed. 3, p. 144. Umbilicaria varia a. polyphylla b. congregata Leight. 
Ann, Mag. Nat. Hist. ser. 2, xviii, p. 279.—Brit, Exs.: Leight. 
n. 65. 
