Rev. W. A. Leighton on the British Umbilicarise. 279 



Howden Gill, Cleveland, Yorkshire, Mr. W. Mudd ! Barmouth, 

 Rev. T. Salwey ! Wrekin and ArcoU Hills, Shropshire ! 



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

 to the stone by a small thickish callous disk, mostly orbicular, 

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

 and a half in diameter ; the edges slightly cleft into numerous, 

 irregulai', rounded lobes, and minutely, but unequally, crenate : 

 upyer surface of a greenish copper-colour when moist ; when dry, 

 black, or of a very dark brown closely approaching to it, smooth, 

 or rarely very slightly wrinkled, and naked, occasionally marked 

 with minute black dots : under surface fol* the most part perfectly 

 black, whether wet or dry, and usually covered with a fine sooty 

 efflorescence, scarcely perceptible without a microscope, which 

 does 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 the upper side : sub- 

 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 margin thin, notched, enclosing 

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

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

 groups." — Turn. ^ Borr. Lick. Brit.^ 



Specimens from Upsal, Fries flL, in my herbarium are iden- 

 tical with this form. 



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

 edges erect or reflexed. 



Maze Beck, Westmoreland ! Mr, W. Robertson in herb. Borrer. 

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

 Scotland ! Mr. G, Lawson. Wrekin and ArcoU Hills, Shrop- 

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



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

 self ^^ Gyrophora anomcea var. variegata,^ are minute specimens 

 of this state of the plant. 



The states monophylla and congregata grow together in some 

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

 passing 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 Ericht ! Mr. Borrer, Clova ! Mr. G. Lawson. 



* We have adopted the descriptions from this privately printed work, 

 as little or nothing can be added to their fidelity and accuracy. 



