Chiefly characterized by its much more continuous and leafy thallus. The P. rubiginosa is a sub-Arctic species, extending as far north as the region of Willows and Birch in Norway.
6. Parhelia stellaris, Ach.; Lick. Univ. p. 476. Engl. Bot. t. 1351.
Hab. Cockburn Island, Graham's Land; on rocks.
A specimen apparently of this species was found ; but in a very insufficient state for determination.
12. LECANORA, Ach.
§ I. Psoroma, Fries.
1. Lecanora microphylla, Ach.; Lick. Uhiv.j>A20. Engl. Bot. 1. 1247. Scharer, Lich. Helvet. n.160.
Hab. Staten Land ; on dead wood, A. Menzies, Esq.
Possibly the L. triptophylla, Fries, but the specimens are not very satisfactory ; they agree tolerably with the plate and specimens quoted. C.Babington.
2. Lecanora paleacea ; (Parmelia), Fries, Lich. Enrop. p. 97. (Tab.CXCVII. Fig. III.)
Hab. Falkland Islands ; on the ground and on Tussock mounds, rare. A very rare and curious species, hitherto known only as a native of Denmark. The paleaceous apothecia resemble a Peziza. We have seen no authentic specimens, and add a figure of the Falkland Island plant.
Plate CXCVII. Fig. III. — 1, plant of the natural size; 2 and 3, young and mature apothecia; 4, vertical section of portion of apothecium ; 5, asci; 6, spores: — highly magnified.
3. Lecanora muscormn, Ach.; Si/n. Met A. Lich. p. 193. Lich. camosus, Engl. Bot. t. 16S4.
Hab. Falkland Islands; on the ground and on decaying roots of Ferns.
4. Lecanora Eypnorum, Ach.; Syn. Meth. Lich. p. 193. Engl. Bot. p. 740. Fl. Antarct. Pt.l. p. 199.
Hab. Hermite Island, Cape Horn ; on mossy trunks of trees. Falkland Islands ; on the ground, &c.
§ II. Placodium, Fries.
5. Lecanora chrysoleuca, Ach.; Lich. Univ. p. 411.
Var. /3. Daltoni ; thallo centro affixo, lobis radiantibus cuneatis, gemmis marginalibus granuliferis. Lecanora Daltoniana, nobis in Lond. Journ. Bot. vol. iii. p. 641. (Tab. CXCVIII. Fig. I.)
Var. y. lignicola ; thallo adnafo, lobis cortice appressis.
Hab. Var. /3. Cockburn Island, Graham's Land. Var. y. Hermite Island, Cape Horn; on trunks of trees.
A very rare inhabitant of the Southern Hemisphere, and there confined to the Antarctic regions. The two varieties are certainly not distinct from the European L. chrysoleuca, which inhabits mountainous regions from Norway to the Alps and Pyrenees.
Plate CXCVIII. Fig. I. — 1, mature, and 2, immature specimens of var. /3. of the natural size ; 3, upper, and 4, lower view of thallus; 5, central portion of ditto, with young apothecia; 6, mature apothecium ; 7. vertical section of ditto ; 8 and 9, portions of ditto showing the lamina proligera ; 10, asci ; 1], spores : — all magnified.
