Rev. W. A. Leighton an the British Umbilicaria3. ?/79 



Ilowden Gill, Cleveland, Yorkshire, Mr. Jf\ Mudd ! Barmouth, 

 Rev. T. Siihvei/\ Wrekiii and Areuli Hills, Shrojishire ! 



" Thallus peltate, Hattish, consisting of a single leaf, adhering 

 to the stone by a sn)all thickish callous disk, mostly orbiculai', 

 but sometimes inclining to elliptical, from half an inch to an inch 

 and a lialf in (haincter ; the edges slightly cleft into numerous, 

 irregulai', rovnuled lobes, and unnutely, but unequally, erenate : 

 iijiper surface of a greenish coj)i)er-colour when moist ; when dry, 

 black, or of a very dark brown closely ;ii)i)roaching to it, smooth, 

 or rarely very slightly wrinkled, and naked, occasionally marked 

 with minute black dots : under surface for the most part perfectly 

 l>laek, whether wet or dry, and usually covered with a tine sooty 

 efflorescence, scarcely pereejjtible witliout a microscope, which 

 docs not stain the fingers; when this is wanting, the surface is 

 generally most minutely granulated, and in some instances 

 blotched with a colour similar to that of tlie upper side : s^tb- • 

 stance coriaceous, but so thin as to be almost membranous, 

 pliant and soft when moist, rigid and extremely brittle when 

 dry. Tricce very rarely produced, scattered, when present, all 

 over the thallus, sessile, but fixed only by their centre, of an 

 irregularly angular figure; their mar(jia thin, notched, enclosing 

 a more or less convex disk, the yijri of which are not arranged 

 concentrically, but compose, for the most part, several separate 

 groups.^^ — Turn, h^ Burr. Lich, Brit.^ 



Specimens from Upsal, Fries fil., in my herbarium are iden- 

 tical with this form. 



b. congregata, T. & B. Thalli small, clustered, nuich curled, 

 edges erect or reflexed. 



Maze Beck, Westmoreland ! Mr. IV. Robertson in herb. Burrer. 

 Mynydd-y-Myfyr near Oswestry, Shropshire ! Rev. T. Salweg. 

 Scotland ! Mr. G. Lawsun. Wrekin and Arcoll Hills, Shrop- 

 shire ! Inglcby, Yorkshire, Mr. W. Mudd ! 



Specimens ! from Acharius in herb. Borrer, labelled by him- 

 self " Gyruphora anonuea var. vuriegatu,'' are minute specimens 

 of this state of the j)lant. 



The states nionoplujUa and congregata grow together in some 

 abundance on the Wrekin and adjoining hills, and may be seen 

 l)assing into each other by every degree of gradation. 



c. sulcata, T. & B. Thallus marked on the upper side with 

 superficial cracks. 



On Ben Ferg, a mountain in Inverness-shire, by the head of 

 Loch Erieht ! Mr. Borrer. Clova ! Mr. G. Lawson. 



* We hiivf :uloi)tf(l tlic iks( riptions fioui tlii> privatclj |>iiiilttl uoik, 

 ;i.< little or iiotluii<f van be iiddeil to their liilelitv aiitl aetiiraey. 



