288 Kcv. Vi . A. T>(>ightoii on t/ie British Unibilicarise. 



])Iant of DiUcnius, 545. t. 82. f. 5, " on rocks near Settle in York- 

 shire." 



** Thnllns aslnj-greii u/ten dry. 



rj. f/risea, Hotfin. Tliallns thin, crenatc, somewhat lobed, 

 papiUosi- on botl\ sicK's ; ujiper side pale asli-coloured, naked; 

 under mostly naked, blaekish. 



Lirlien jmlmonaritis saxatilis, e ciiiereo-fuscus, minimus, Tonrn. Instit. bA\) 



(171!'); Vaill. Pari.s. IK;. t. 21. f. 14. 

 Lichennides snxnfile, foliis minus divisis, cinereo-fuscum. Dill, in Ifaii Svii. 



coriaceuni cinereum. pvltis a'ris compressis. Dill. 2V.K 



Lichen deuslus, Robs. Br. Fl. :«)(» (1777) t. .W. f. 117 (1741) (lido herbaiii 



DilliMiiani v\. Uorrcro teste). 

 r/riscus. Swartz in N. Act. Stockh. v. i).91. t. 2. f. 3 (fide Ach.) ; Wcstr. 



in Act. Stockli. ]7'M (lidc Ach.); Rctz. Scand. 2S(J. 

 UmbHicnria f/risea, Ilottin. Fl. (iorin. 2. Ill (17i'5). 

 Lichen Di/lenii, Witii. Arr. 4. (V.i (17!><i). 



murinus, Ach. IVodr. 14.3 (17!^^). 



Umhilicaria murina, 1>C. Fl. Frauy. ;:!nl ed. 3. 412 (1805); Nyl. N. Class. 



17.5. 

 Gyrophnra hirsuta, y. murina, Flcirke hi Berlin Mag. 1810, ]>. GJ (fide 



Sell icier). 

 Gyrophora mitrino, Ach. Meth. 110 (180.3); L. Univ. 2:^ ; Syn. G'J ; Sm. 



K. Bot. t. 24S<! ; Stcnh. in Sclicd. Crit. fasc. 5 & fi. no. 1.32 (182r)); 



Hook. Brit. Fl. 2. 218 ; Clicv. Paris. 1. M3. t. 14. f. 11 c. 



f/risc'd. Turn. & Borr. Licli. Brit. 2.3(1 (181.3). 



Umbilicaria depressa, ji. spaduchroa \, Sclucr. Spicil. 82. .3(52 (1823-3(5). 

 Gyrotnium velhum, 8. murinum, Walil. Fl. Siiec. 857 (lS24-2(5). 

 Graphis tellea, fi. alutacea, Wallr. Cryjit. Germ. .344 (1831). 

 Umbilicaria vellea, y. hirsuta, * murina, Fries, L. Reform. 358 (1831); 



Suinnia Veg. Scand. 117. 

 vellea, y. spadochroa, a. grisea, Schacr. Enum. 24 (1850). 



Found on St. Vincent's Rocks near Bristol by Mr. Dare, Dil- 

 leiiius. 



" ThftUus jieltatc, consisting generally of a single, orbicular, 

 crumjiled, concave leaf, from an inch to an inch and a half in dia- 

 meter ; sometimes of two or three smaller leaves ; attached to the 

 stone on which it grows by a callous central di;k, divided at the 

 edges into a few, shallow, rounded lobes, and irregidarly notched 

 or crenate : upjter surface of an ash-colour, with a slight tinge 

 of brownish-green when wet; white ash -colour and subpruinose, 

 but still brownish towards the edges, when dry ; granulated, as 

 if minutely cracked all over, but smooth to the touch, and 

 scarcely appearing rough to the naked eye : under surface, 

 whether wet or dry, dark brown, varying to almost black, 

 covered with a minute .shagreen -like roughness, naked, or very 

 rarely producing a few scattered branched fibres : substance thin, 

 flexible when wet, and still somewhat flexible, but briltU", when 



