280 Ilev. W. A. Leigh ton on the British Uinbilicariae. 



" Thallus somcwliat thicker than in ' a/ simple or more or 

 less compound ; upper surface marked with a few superficial, 

 undulating, indented lines, the edges of which occasionally sepa- 

 rate so as to leave a smooth black interstice ; under surface as in 

 ' a/ but more commonly blotched with the paler colour of the 

 upper side." — Lich. Brit. 



This state seems apparently a transition to hijperhorea, 



d. lacera. Thallus very deeply divided, divisions laeero-lobate. 



Craig Kaynoch ! Mr. W. Gardner in herb. Borrer. Scotland ! 

 Mr. G. Lawson. 



The mode of division of the margins of this state is different 

 from that of the preceding ones, and assimilates to that observable 

 in anthracina. 



A specimen in my herbarium, collected by M. Philippe at 

 Tourmalet, Pyrenees, agrees with this state. 



Mr. Borrer's herbarium contains specimens ! of G. anthracina 

 from Acharius and Schserer, with which I have not noticed any- 

 thing identical among British plants. Their general appearance 

 is different from polyphylla, but the sporidia are similar. (See 

 PI. X. fig. 3.) 



Plate X. iig. 2. • 



^. fiocculosa, Hoffm. Thallus thin, unequally lobed ; upper 

 side of a greeuisb copper-colour, dotted, and rough with sooty 

 granulations ; under, black, naked, pitted. 



Lichen floceulosus, Wulf. in Jacq. Coll. 3. 99. t. 1. f. 2 (1789), fide Turn. 



& Borr. 

 Lichen deustus, Schrank, Fl. Salisb. 234 (1792) ; Westring in Act. Stockh. 



1793 (fide Acli.) ; Ach. Prodr. 145 (excl. Linn. syn.). 

 VmhiUcaria fiocculosa, Hoffm. Fl. Germ. 2. 110 (1795) ; PI. Lich. 3. fasc. 4. 



3. t. 68. figs. 1-4; Massal. Ricerch. 61 (excl. syn.). 

 Gyrophora deusta, Ach. Meth. 102 (1803); L. Univ. 255; Syn. 66 (excl. 



Linn. syn. in all) ; Sm. E. Bot. t. 248^^. 

 Gyrophora fiocculosa. Turn. & Borr. Lich. Brit. 217 (1813); Koerber, L. 



Germ. 95. 

 Gyromium deustum, Wahl. Fl. Carpath. 394 (1814); Fl. Upsal. 423; Fl. 



Suec. 856 (excl. Linn. syn.). 

 Umbilicaria polyphylla, c. deusta. Fries, L. Reform. 352, excl. Linn. svn. 



(1831); Nyl. Nouv. Classif. 175. 

 Grapkis cenea, ». concolor, Walh*. Crypt. Germ. 1. 341 (1831). 

 Gyrophora deusta, Hook. Fl. Scot. 42 (1821); Brit. Fl. 2. 218 (excl. Linn. 



syn.) ; Grev. Fl. Edin. 328. 

 Umbilicaria tenea, y. fiocculosa, Schaer. Spicil. 91. 364 (1823-36); Exs. 



152! 



polyphylla, ^. deusta, Tuckerm. Syn. 71 (1848). 



r polyphylla, ^.fiocculosa, Schajr. Enum. 28 (1850). 



varia, var. fiocculosa, Leight. Brit. Lich. Exsicc. 219 ! 



Highlands of Scotland, Mr. Dickson. Corstorphine and Craig- 



