286 Rev. W. A. Lcighton on the British Umbilicarise. 



Specimens oferosa from Upsal, Sweden, Fries fil. ; Stockholm, 

 Dr. Nylanderf and Saibtcn, M. Philippe, in my own herbarium, 

 are idoitical with our British j)laut. 



Plate X. fig. 7- Sporidia. Fig. 8. Section of thalkis and apothecia. 



f. pellitay DC. Thallus thin, unequally lobed and crenate; 

 upper side greenish copper-colour, smooth ; under side black, 

 papillose, reticulated and densely fibrous ; tricae immarginate, 

 growing out into tufts of fibres. 



TAchenoides pullum superne et glabi'um, infeme nigrum et cirrosutn, Dill. 



226. t.^iO. f. 130(1741). 

 Lichen poly rhizos, Linn. Sj). PI. 1618? ; Lightf. Fl. Scot. 2. 864 ; Robson, 



Br. Fl. 301 ; With. Arr. 4. 64 (excl. syn. 2do Dill.). 



velleus a,, Huds. Fl. Angl. 550 (1778) (excl. var. /3). 



Umbilicaria vellea, HoflFm. PI. Licli. 2. \). t. 26. f. 3 (excl. Linn, syn.) (17^1), 



admirable; Schrad. Spied. 105 (excl. syn. Lightf.). 

 Lichen hirsutus, Westr. in Act. Stockh. 1793 (fide Ach.). > :: 

 pellitus, Ach. in Act. Stockh. xv. ^\). t. 3. f. 2 (1794); Prod. 149 ; Snk/ 



E. Bot. t. 931. , I ;r ,. 



Gyrophora pellita, Ach. Meth. 108 (1803); L.Univ. 228. t. 2. f. id; Syn. 



{^7 ; Turn. & Borr. ! Lich. Brit. 238 ; Hook. Fl. Scot. 2. 42; Brit.' 



Fl. 2. 219; Tavl. Fl. Hib. pt. 2. 155 ; Chev. Fl. Paris. 1. 644. 

 Umbilicaria pellita', DC. Fl. Fran?. 3rd ed. 2. 409 (1805). 



depressa, /3. spadochroa F, Schajr. Spicil. 83. 362 (1823-36). 



Gyromium polyrrhizon, Wahl. Fl. Suec. 858 (1824-26). 



Umbilicaria polyrrhizos, Fries, L. Reform. 358 (1851) ; Summa Veg. Scand. 



117 ; Schfer. Enura. 29 ; Nyl. N. Class. 175. 



On the rocks called Llyn Llydaw, Snowdon ; and about Llyu 

 Cwm y Ffynnon tas; also on the summit of the mountains at 

 Cwm Brwynog towards Ardhu near Llanberris, Dillenius. High- 

 lands and Lowlands of Scotland, Lightfoot. Clark^s Park and 

 Paradise near Money musk, Aberdeenshire, Withering, Carnedd 

 Llewellin, near the summit. On Moel Shabod near Capel Cerrig, 

 Caernarvonshire, Mr. Griffith. Yorkshire, Mr. W. Brunfon, 

 Durham, Rev. J. Harriman. Cheshire, Turner and Borrer. On 

 rocks on Tonlagee, Co. Wicklow, Dr. Taylor. Scotland ! Mr. 

 G. Donn in herb, Borrer, without locality (fructu) ! Mr. Soioerby 

 in herb. Borrer. Cronkley (fructu) ! Mr. W, Robertson in herb. 

 Boirer. Loch Phadrick ! Craig Koynoch ! Clova ! Mr. W. Gard- 

 ner in herb. Borrer. Ben Ferrag ! Llyn Canvay ! Mr. Bonder. 

 Near Lake Tumanel, Cumberland (fructu) ! Mis. Joshua Stanger. 

 Barmouth, N. Wales ! Rev. T. Salwey. Clova ! Mr. G. Lawson. 



'' Thallus peltate, sometimes simple, but generally consisting 

 of many leaves, spreading from a common central disk, by which 

 they are affixed to the stone, in a roundish cluster varying from 

 1 to 3 or 4 inches in diameter ; many such clusters often forming 

 together irregular patches of considerable extent : the leaves vary 

 much in size, in proportion as the thallus is more or less com- 



