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



many species. In my opinion our British Umbilicaria appear to 

 resolve themselves into two species only, U. pustulata, which has 

 peculiar sporidia, and U. varia, which may include all the rest, 

 the sporidia being alike in all ; and this latter species comprises 

 two series distinguished by the copper or grey colour of the 

 thallus. 



1. Umbilicaria varia. Thallus coppery or ashy-grey, simple 

 or compound, naked or fringed at the margins ; upper surface 

 smooth, efflorescent, granulate, pustulate, areolate, corrugate or 

 reticulated; lower surface smooth, pitted, granulate, papillose, 

 fibrous or reticulated; sporidia in asci, eight, minute, oblong, 

 pale* 



* Thallus dark copper-coloured when dry, 



a. polyphylla, Schrad. Thallus thin, unequally lobed, naked 

 and smooth on both sides; upper side greenish copper-colour, 

 under black. 



Lichenoides tenue pullum, foUis utrinque glabris, Dill. 225. t. 30. f. 129. 



A. B. C(1741). 

 Lichen ^c. undique glaher, Linn. Fl. Lapp. no. 452 (excl. syn.). 

 Lichen polyphyllus, Linn. Sp. PL 1618 (ed.2. 1763); Huds. Fl. Brit. 551 ; 



Lightf. Fl. Scot. 2. 863; Robson,Br. Fl- 300; Web. Spicil. 258; Humb. 



Fl. Frieb. 29; Retz. Scand* 288; With. Arr. 4. 65; Sm. E. Bot. 



t 12S2 

 Lichen glaher, " Ach. in Act. Stockh. xv. 95. t. 2. f. 5 " (1/94) (fide Ach. 



et T. & B.); Ach. Prodr. 144. 

 Umbilicaria polyphylla, Schrad. Spicil. 102 (1794); IIofFin. Fl. Germ. 2. 



109; PI. Lich. 3, 14. t. 59. f. 2; «, Tuckerra. Syn. 71. 

 Gyrophora glabra, Ach. Meth. 101 (1803) ; et, Syn. 63. excl. syn. var. an- 



thracina ; ««. & /3, Hook. Fl. Scot. 2. 41 ; Heppe, Fl. Wurzburg. 69 ; 



Chev. Fl. Paris, ed. 2. 1. 643. 

 Umbilicaria glabra «, DC. Fl. Fran?, ed. 3. ^ 412 (1805). 

 Gyrophora heteroidea ec. Sf /3, Ach. L. Univ. 218 (1810) ; Moug. & Nestl. 



342! 

 Gyromium polyphyllum, Wahl. Fl. Lapp. 481 (1812); Fl. Carpath. 394; 



FL Upsal. 423 ; Fl. Suec, 481. 

 Gyrophora polyphylla, Turn. & Borr. Lich. Brit. 214 (1813); Hook. Br. 



Fl. 2. 217; Koerber, Lich. Germ. 95. 

 Umbilicaria cenea, u. glabra, Scha^r. Spicil. 90. 364 (1826-33) ; Exs. 149 ! 

 Umbilicaria polyphylla, Fries, L. Ref. 352. excl. b. & c. (1831); S. V. S. 



117 ; Lcight. Lich. Brit. Exs. 65 ! 

 Umbilicaria polyphylla, u. glabra, Schser. Enum. 28 (1850). 

 Graphis tenea, jS. discolor, Wallr. Crypt. Germ. 1. 341 (1831). 



a. monophylla. Thallus of a single peltate leaf. — Turn. & 

 Borr. /. c. 



Snowdon, 'D»??«i/m5. Cheshire and Cornwall, Lich, Bint. 

 JPlova ! Craig Raynoch ! Mr. W. Gardner in herb. Borrer. York- 

 shire I Mr. G. Dixon. Scotland ! Mr. G. Lawson. Ligleby and 



