16. Lecidea arctica, Sornmerf., Lapp. p. 156. Fries, Lich. Europ. p. 342.
Hab. Hermite Island, Cape Horn ; on hard gravelly soil. 17. Lecidea milliaria, var. c. ligniaria, Fries, Lich. Europ. p. 343. Lichen dubius, Engl. Bot. t. 2347. Lecidea elaeochroma, Ach.; nobis, in Lond. Jonrn. Bot. vol. iii. p. 636.
Hab. Falkland Islands ; on dead twigs of Acmna.
A very puzzling species, differing from L. elaochroma in the pale hypothallus. I am doubtful if the English Botany L. dubius be the same plant, or L. milliaria, Fries. The only others to which the Falkland Island one can be referred, are L. dolosa, Fries, and L. sabidetorum, Fr. : but after a careful examination of Schserer's specimen of the former, and Reichenbach's of the latter, I have concluded that this belongs to neither of them. C.B.
18. Lecidea abietina, var. rubens, Eschweiler, in Mart. Fl. Bras. p. 251.
Hab. Hermite Island, Cape Horn; on bark.
I doubt not this being Eschweiler's plant, but am not convinced of that being the same with the European L. abietina. The hypophlccdal crust appears to indicate its not being a true Lecidea, whence it may prove to be a Lecideal form of some Pyrenotheca ; to which genus the L. abietina properly belongs.
16. GYROPHOEA, Ach.
1. Gyrophora anea, var. a. Schaerer, Lich. Helvet. n. 149.
Hab. Falkland Islands; on quartz rocks; very rare and barren.
It is remarkable that the Antarctic regions shoidd present us with but a solitary species of this curious genus, which abounds so strikingly in the Arctic. In one respect they are replaced by Stictcs, which are almost equally rare in the high northern latitudes. These latter affect an equable, as decidedly as the Gyrophora do an extreme climate; and it is in the Falkland Islands, of all the Antarctic localities, that the Lichens are exposed to the greatest and most sudden vicissitudes. The G. eenea, considered by Fries as a variety of G. liyperborea, is a Scotch and American plant.
17. OPEGEAPHA, Ach.
1. Opegrapha atra, Pers.; Schterer, Lich. Helvet. n. 93. Hab. Hermite Island, Cape Horn; on the bark of trees. Falkland Islands ; on stems of Acsrna.
18. AETHONIA, Ach.
1. Arthonia polymorpha, Ach. ; Syn. Lich. p. 7. Eschweiler, in Mart. Fl. Bras. Crypt, p. 14. t. 9. f. 3.
{tabula sub. nom. A. tremellosa.) Lecanora micropthalma, nobis in Lond. Touru. Bot. vol. iii. p. 636.
Hab. Hermite Island, Cape Horn ; on Winter's bark.
19. PEETUSARIA, DC.
1. Pertusaria communis, DC. ; Engl. Bot. t. 677. Scharer, Lich. Helvet. n. 118.
Hab. Hermite Island, Cape Horn; encrusting the bark of trees, abundant. Kergueleu's Land; on rocks near the sea. Cockburn Island, Graham's Land; on rocks.
