THE VEGETATION OF THE JUAN FERNANDEZ ISLANDS 923 



a lichen cover, with the exception of the hard and very resistant basalt dykes 

 which are so conspicuous here. Unfortunately landing is difficult, and very often 

 quite impossible where the barranca plunges abruptly into the sea, and there are 

 long reaches of this kind of coast. In little caves washed by the spray a few 

 ferns have found refuge, among them the halophytic Asplenium obliquum (PI. 

 77:2). In cases it is accompanied by Adiantum chilensc and Blechnum aurkuiatum, 

 and, where freshwater oozes out, Lobelia alata. Where there is a strip of beach, 

 a fringe of Salicornia may be seen. 



52. (13.) Lobelia a/aia-co\ony. Landing place in Puerto Ingles, a small cove, 

 separated from the bay, where the surf generally is too strong, by a projecting 

 spur of rock, forming the roof of the so-called Robinson's cave. Steep, slightly 

 overhanging cliff, where water trickles down. 201 1917. PI. 101:1. 



11:2 Asplenium obliquutn var. i, fissures 



Rea pruinata I Spergularia conferti flora i 



Polypogon crinitus i 

 Rume.x crispus i 



Bryum fernandezianutn, carpets 



II: I 



Lobelia alata v. rupincola 4 greg. 



The rock above is covered with lichens: Lecanora saxicola, Parmelia caperata 

 and Caloplaca elegans var. australis. 



53. (11 B.) Lichen communities on exposed coast rocks, north headland of 

 Bahia del Padre, 151 1917. Lowest exposed strata little resistant to erosion, surf 

 heavy and surge zone without vegetation, but the storm zone has a black coating, 

 perhaps a Verrucaria, of which I was unable to get samples on my only visit 

 to this place. On the harder basalt dyke, the spray zone, well developed above 

 3Y2 to 4 m above high-water level, has a cover of crustaceous lichens; the single 

 fruticulose species, Rantalina linearis, did not, as far as I remember, occupy a 

 definite zone. The list does not at all pretend to be complete. 



Blastenia femandeziana cop. Gyalecta jenensis 



Buellia halophiloides Lecanora atra 



» siphoniatula ^ dispersa 



» stellulata cop. » Ingae 



» spp. Microglaena fernandeziana 



Caloplaca elegans v. australis cop. Parmelia conspersa var. 



« Selkirkii Pertusaria melanospora cop. 



Dirina limitata Verrucaria microspora 



54. Salicornia peruviana-SociaUon. Bahia del Padre, at the landing-place, 



forming a pure salt-meadow, i; i 191 7. PI. 102. 



II: 2 

 Salicornia peruviana 5 



A rill crosses the Salicornietum. Scirpus cernuus forms a fringe near the out- 

 let. Tetragonia expansa was seen in Bahia del Padre by Johow. 



