22 THE VOYAGE OF H.M.S. CHALLENGER. 



Fernandez that does not reach Chili, namely, Pteris comans. The endemic element of 

 Juan Fernandez offers nothing remarkable except the monotypic genus Thyrsopteris, which 

 is perhaps as markedly characterised as any genus of ferns: the number of monotypic 

 genera of ferns, as limited in Hooker and Baker's Synopsis, is small. 



The total absence of the genus Lycopodium 1 is one of the most unexpected facts in 

 connection with the vegetation of Juan Fernandez, for two or three species abound in most 

 of the islands dealt with in the preceding parts of this work. The very widely spread 

 Psilotum is apparently likewise wanting. 



Very Rare or Extinct Plants. 

 A considerable number of species collected by Bertero in 1830, or by collectors who 

 preceded him, are not in any of the more recent collections examined ; hence it may be 

 inferred that they are either very rare and local, or that they have disappeared altogether. 

 They are : — Colletia spartioides, Myrtus selhirkii, Psychotria pyrifolia, Robinsonia 

 macrocephala, Robinsonia thurifera, Dendroseris berteriana, Dendroseris marginata, 

 Dendroseris micraniha, Dendroseris mollis, Dendroseris neriifolia, Wahlenbergia ber- 

 teroi, Peperomia margaritifera, Loranthus berteroi, Urtica glomerulaflora, Polypogon 

 crinitus, Bromus cebadilla, Pol 'y podium punctatum. 



Another proof of the very local occurrence of many of the species is the fact that 

 several other species collected either before or since Bertero's time, are only found in one 

 collection. A striking example is offered by Podophorus, a very distinct endemic mono- 

 typic genus of grasses, of which we have seen only one specimen sent to Kew by Dr 

 Philippi. Again, Robinsonia macrocephala, Dene., collected by Gay, is in none of our 

 collections. 



The Plants of Masafuera. 

 There appears to be no published description of the general features of the vegetation 

 of Masafuera, but it is evidently very scanty, and a fragment of the same flora as Juan 

 Fernandez. The plants are : — Spergularia rubra, Sophora tetraptera, *Eryngium sarco- 

 phyllum, Psychotria pyrifolia, Erigeron fruticosus, ''''Erigeron rupicolus, * Gnaphalium 

 insulare, Gna-phalium fernandezianum, Dendroseris macrophylla, '"" Wahlenbergia tube- 

 rosa Pernettya rigida, Calysfegia tuguriorum, Rhaphiihamnus longiflorus, Sahcornia 

 peruviana, * Urtica masafuera}, Libertia formosa, Uncinia douglasii, Carex paleata, 

 Pautatlicra fenuuideziana, Ilymenophyllum dichotomum, Trichomanes exsectum, *Poly- 

 jiodii'ii) masafuera. 



Altogether, twenty-two vascular plants are recorded from Masafuera, and of these six 

 are apparently peculiar ; all the rest, except Calystegia tuguriorum, being common to this 

 island and Juan Fernandez. We have seen no authenticated specimens of Erigeron 



1 Lycopodium saurums ia recorded by Spring (Monogr. Lycop. ii. ]>. 7) from Cumberland Bay, Juan Fer- 

 uandez j but, as the label in the Kew Herbarium indicates, it should have been Cumberland Lay, Kerguelen 

 Island. 



