DUSEN: THE VEGETATION OF WESTERN PATAGONIA. 23 



Deschampsia aciphylla (Franch.) Speg. Glyceria fluitans R. Br. var. stricta Desv. 



* Trisetum subspicatum Beauv. var. glabri- * Festuca purpurascens Banks et Sol. 



folium Hook. * Bronius catJiarticus Mol. 



* Cortaderia pilosa (d'Urv.) Hack. albowianus Kurtz. 



* araucana Stapf. * Hordeum comosum Presl. 



* Poa nemoralis L. var. magellanica Hack. secalinum Schreb. var. chilense Desv. 



* Poa scaberula Hook. fil. Equisetum bogotense H.B.K. 



fuegiana (Hook, fil.) Hack. Mertensia cryptocarpa Fee. 



It is true that some of the species here indicated as immigrants, were 

 not found either in the district of deciduous beeches, or on the steppes, 

 but as I observed that they grew sparsely and only in the upper 

 part of the section of the valley now in question, I think there is no 

 doubt of their migration. Such species are: Senecio dusenii, Nas- 

 sauvt'a dusenii, Haplopappus coronopifolius, Arenaria serpylloides var. 

 andicola, Ritmex decumbens, Cortaderia araucana and Poa scaberula, 

 all of which, except the last, presumably have their home in the 

 western section of the steppe district. Very likely the number of species 

 carried down by the river is actually greater than I have given in the 

 above list. 



In the (Q/vz/tf-formation the mosses do not rank nearly so high as in the 

 coast district and, on the whole, the moss-flora of the Aysen valley differs 

 largely from that of the coast, this being true especially of the Musci 

 proper. So far as the Hepaticce are concerned, the disparity is not quite 

 so marked, not a few species being common to both districts. Neverthe- 

 less, those species characteristic of the coast are wanting in the valley, 

 and if one or other of them is occasionally found, it is always sparingly, 

 so that they never play an important part here. Besides this, Hepaticce, 

 with a few exceptions, occur in comparatively small numbers, Musci taking 

 the lead both in species and individuals. 



Of epiphytic Hepaticcz the following are of importance: Plagiochila 

 ritfescens Steph., P. bispinosa Ldbg., P. imcialis and P. flexicaulis, only 

 the last named occurring numerously now and then ; further Lophocolea 

 conifolia Steph., L. fnfoella, L. gay ana, L. humilis, L. irregularis Steph., 

 L. cuciillistip2tla Steph. and L. namcularis Steph., of which the last two 

 are the commonest and have the widest range. Chiloscyphus paraphyl- 

 linus Steph., Trichocolea verticillata, Radula plumosa and R. tenera, 

 Madotheca recurva Tayl. and M. gracilenta Tayl., these last two being 

 common and often plentiful ; Frullania boveana Mass, and F. lobulata 



