Falklands, etc.] FLORA ANTARCTICA. 535 



6. Lecanora Babingtoni, Hook. til. et Tayl.; thallo crustaceo adnato orbiculari subsquamuloso 

 areolato areolis radiantibus albido-glaucesceute demum virescente, squaniulis diffractis ambitu sub-continuis 

 crenulatis, apotheciis adnatis margine thallode tenuissinio evanescente, disco atro primitus tumido margine 

 subelevato demum plauiore irnmarginato. Lecidea atro-alba, nobis in Loud. Journ. Bot. vol. iii. p. 636 

 {quoad exempt. Ins. CocEurn) . (Tab. CXCVIII. Fig. II.) 



Hab. Cockbum Island, Graham's Land; on volcanic rocks. 



Tliallus inconspicuus -i— 1 unc. diametro, margine definito crenulato, totus in areolas minimas (non nisi ope lentis 

 conspicnas) diffractus ; areolis angulatis, albidis, sasse adnatis, centralibus fertilibus, reliquis radiantibus, extimis 

 subfoliaceis lobatis crenulatisve. Apothecia punctiformia, interiora majora subconfluentia. 



Although the specimens of this plant brought from Cockburn Island are very perfect and well developed, they 

 belong to so difficult a group of Lichens as to have baffled the Rev. Mess. Babington, Berkeley, and ourselves, 

 in our attempts to reduce it to any known species. Though closely resembling a Lecidea in habit, and, indeed, in 

 characters too, it is certainly not of that genus, for though, as Mr. Berkeley remarks, the apothecia of Lecid. rivulosa 

 and confluent are sometimes obscurely margined (as in this species), yet, Mr. Babington observes, that the thallus 

 here is radiating, which is not the case with the areolate Lecidea, nor has it the carbonaceous margin to the 

 apothecium and substratum of that genus. 



Of the tribe in which it should be placed (as a Lecanord) there is some doubt : Mr. Berkeley regards it as 

 belonging to the section " glaucescentes " of Placodium, Fries, and allied to L. coarctata, in which the thallodal border 

 of the apothecium is evanescent. Mr. Babmgton, on the other hand, remarks, that the thallodal border and that 

 of the disc itself place it in Psora, Fries, and that it will rank amongst the section "glaucescentes " near L. melanaspis, 

 of which it may possibly be a variety, or a depauperated and crustaceous form. The figure represents the plant as 

 freshly gathered, before drying ; it has since assumed a more obscure, somewhat leaden colour, and the oldest 

 portions of the thallus break up into a greenish mass, which is not given in our plate. 



Plate CXCVIII. Fig. II. — 1, plant of the natural size ; 2, portion of ditto ; 3, central part of thallus and 

 apothecia; 4 and 5, lateral views of areola and apothecia; 6, vertical slice of two apothecia; 7, portion of lamina 

 proligera : — highly magnified. 



7. Lecanora. getida, Ach.; Lic/i. Univ. p. 428. Engl. Bot. t. 699. Urceolaria macropthalma, nobis 

 in Lond. Journ. Bot. vol. iii. p. 640. 



Var. 0. vitellina, thallo vitellino. 

 Hab. Kerguelen's Land ; both varieties very common. 



The variety 0. is probably dependent on the thallus having changed colour-. What was described as Urceolaria 

 macropthalma is a state noticed by Fries (Lich. Europ. p. 104). C.Babington. 



8. Lecanora murorum, Ach.; Lich. Univ. p. 433. Engl. Bot. t. 2157. 

 V&r.farcta ; apotheciis substantia granulata fere clausis. 



Hab. Hermite Island, Cape Horn, the Falkland Islands, and Cockburn Island, Graham's Land; on 

 maritime rocks. Var. 0. Kerguelen's Land ; on rocks near the sea. 



9. Lecanora miniata, Ach.; Lich. Univ. p. 434. Hoffm. Plant. Lich. t. 60. f. 1. 



Hab. Falkland Islands, and Cockburn Island, Graham's Land; very abundantly on rocks near the sea. 



This plant forms the most curious feature in the botany of Cockbum Island, a desolate spot of land on the 



extreme limit of southern vegetation ; for there it abounds so as to stain the rocks, and render the colour thus 



