The Cockbiirn Island specimens are very imperfect, and may possibly belong to Umbilicaria sordida.
2. Perttjsaria Wulfeiiii, DC. ; Fries, Licli. Europ. p. 424. Porina fallax, Pers. ; Ach. Synops. Licit, p. 110. Lichen hymenius, Engl. Bot. t. 1731.
Hab. Falkland Islands; on rocks.
20. THELOTEEMA, Ach.
1. Thelotrema lepadinum, Ach.; Lick. Univ. p. 312. t. 6. f. 1. Scheerer, Lick. Helvel. n. 121. El. Antarct. Pt, 1. p. 200.
Hab. Herrnite Island, Cape Horn ; on Winter's-bark.
21. VERRUCARIA, Pers.
1. Verrucaria umbrina, Ach.; Lick. Univ. p. 291. Engl. Bot. 1. 1499. V. gelida, nobis in Lond.
Journ. Bot. vol. iii. p. 639. (Tab. CXCVIII. Pig. IV.)
Hab. Cockbiirn Island, Graham's Land ; on rocks.
The difference between the apothecia of the Antarctic and European specimens is the same as exists between V. tnaura and V. umbrina, plants which I consider as specifically the same. C. Bahington.
Plate CXCVIII. Fig. TV, — 1, plant of the natural size; 2, portion of crusti ; 3, do with apothecia; 4 and 5, apothecia; 6 and 7, vertical slices of do; 8, portion of lamina proligera; 9 and 10, sporules : — all very highly magnified.
22. COLLEMA, Ach.
1. Collema crispum, Ach.; Synops. Lick. p. 311. Engl. Bot. t. 834. Parmelia pulposa, Scheerer.
Hab. Cockbum Island, Graham's Land ; on wet earth.
Miserably depauperated specimens, referred both by the Rev. Mr. Berkeley and Babington to this plant.
2. Collema tremelloides, Ach.; Lich. Univ. p. 455. Engl. Bot. 1. 1981.
Hab. Hermite Island, Cape Horn; on wet banks.
Possibly the C. pahnatum, Sin.; my only specimen of which plant (received from Mr. Borrer), may be a dwarf and brown one of C. tremelloides. C. Babington.
3. Collema saturninum, Ach ; Lich. Univ. p. 644. Engl. Bot. t. 1980. C. myochroma, Scheerer, Lich. Helvet.
Var. australe, thallo subferrugineo. Collema australis, nobis in Lond. Joum. Bot. vol. iii. p. 656.
Hab. Hermite Island, Cape Horn ; on wet banks in dense woods ; abundant.
There is a redder hue about these specimens than I am accustomed to see in British ones of C. saturninum, but according to Schrerer's description, this is evidently a very variable plant. The characters drawn from the powdery buds, are not available. C. Babington.
