93' 



C. SKOTTSBERG 



II: I 



Asplenimn tnacrosorum i rare 



I 

 Fissidens maschalanthus 

 Rhaphidostegium aberrans 



Epiphytes on Drimys 

 Dicranolo))ia capillifoliujn 

 Macroniiirium saxatile cop. 

 Zygodon peniastichum 

 Rigodiiim toxariuni festoons 

 Weymouthia mollis » 



Bazzania cerina 



Cora pavonia 

 Nephrotna antarcttcum 

 Parmelia revoluta 

 Sphaerophorus jnelanocarpi/s 

 Usnea suhtornlosa 



Epiphytes on Dicksom'a 



Hvtnenophyllu»i pectinatiim 

 « plicatum 



» J-llgOSl(Hl 



Serpyllopsis caespitosa v. J'ernandeziana 

 feniandeziana 



Riccardia breviramosa 

 Epiphyllous Hepaticac on Hymenophylluvi spp. 



Brachiolejeunea spruceana 

 Cololejeunea Skottsbergii 

 Colura bulbosa 

 Harpalejcutiea oxyota 

 Lejeiinea reticulata 

 Siphonolejeiinea nudicalycina 



64. (23 C.) Dicksonia externa-BlecJinum cjcadifolmm-'Soc\2iX\on. A lower, less 

 dense stand near St. 63, with burnt patches; soil a thick, spongy fern-peat, under- 

 mined by the burrows of the Masafueran fardela [Oestrclata exterjta Salv.). Anal- 

 ysis incomplete. 



Ill 



Dicksonia externa 4 



11:3 

 Blechniim cycadi/oliu/n 2 

 Dryopteris inaequalifolia i 

 Histiopteris incisa i 

 LopJioso?-ia qitadjipinnata i 



PJwenicoseris regia i (much damaged) 

 Robinsotiia Masafuerae i 

 Thyrsopteris elegans i 

 Urtica fernattdeziana burnt place 



I 



Ma?xhantia polymorpha, covering 

 burnt places 



The Vegetation of the deep canyons. 



Our survey of the interior of the canyons was concentrated on Ouebrada 

 de las Casas, together with O. de las Vacas the finest example in the island of 

 this valley type. The streambed consists of round, polished stones and large 

 boulders; it fills the valley floor, which in the narrowest places does not exceed 

 10 or 15 m in width, w'hereas the vertical walls are several hundred m high 

 (Pis. 109:2, no). The rock at the foot of the cliff" may offer a passage, now on 

 one side, now on the other, or the streambed itself is the only practicable road. 

 After a spell of dry weather only pools of crystal clear water are left, but after 

 a downpour in the mountains the scenery rapidly changes, the stream overflows 

 and the canyon is closed. The air is humid and the light very subdued, the 

 morning sun illuminating the depths of the gorge for a short while only. Along 

 the stream Gimytera luxuriates as nowhere else (PI. ill). The vegetation on the 

 walls is a mixture of trees and shrubs, clinging to the shelves and crevices, grasses 

 and herbs, particularly ferns, and wet carpets of bryophytes in various shades of 



