Bd. IV: ii) 



THE LICHENS. 



6l 



Some geographical considerations. 



In the year 1847 HOOKER published in his Flora Antarctica (Vol. II) a list of 

 nine lichens which had been collected on Cockburn Island. This is his list: 



Lecanora (now Placodium) miniata Ach. 



P- 535- 

 Pertusaria communis D. C. p. 549. 

 Verrucaria umbrina Ach. p. 541. 

 Collema crispum Ach. p. 541. 



Pannelia saxatilis Ach. p. 533. 



(now Physcia) stcllaris Ach. 



P- 534- 

 Lecanora ckrysoleuca Ach. p. 534. 



t> Babingtonii HOOK. FIL. et Tay L. 



P- 535- 

 (now Placodium)murorum Ach. 



P- 535- 



Of these plants only four have been again found by more recent expeditions 

 but not even these in the same localities. Physcia stcllaris and Lecanora ckryso- 

 leuca have been recorded from Victoria Land. Placodium murorum and miniatum 

 have been found in South Georgia and the former also in the South Shetland Is- 

 lands, in the Western Antarctis, but not on Cockburn Island and in Victoria Land. 

 For more than half a century this List was the only Lichen List from the Antarctic 

 Continent. It is only during the last ten years that Lichens have been brought in 

 larger quantities from the true Antarctic Regions. 



An historical enumeration of the material and the new species brought back by 

 the various expeditions from the Antarctic bontinent is of some interest. 



