THE PrERIDOPHYTA OF THE JUAN FERNANDEZ ISLANDS 45 



stripe along the middle of the sterile lamina. From all species known to us 

 it seems very well marked by the long shaft of the sterile lamina and by the 

 short peduncle, which scarcely and rarely overtops the sterile lamina. The 

 whole common stalk- as well as the stipe of the sterile lamina and nearly the 

 whole peduncle of the spike are, at least in all specimens collected, hypogaeus 

 and without chlorophyll. The venation is seen in fig. 7 c, drawn by Mag. 

 Mai THIESEN. 



Area of distribution: Endemic in Masatierra. 



Lycopodiaceae. 

 Lycopodium L. 



*50. L. magellanicum Sw. Syn. Fil. 180 (1806). 

 Only in the alpine heath, rare. Fertile in the autumn. 

 Masafuera: In the higher parts of the Alpine region, Las Torres, c. 

 1350 m, scarce (no. 482). — New for Juan Fernandez. 



A very robust form, with deeply subterraneous rhizome, larger than any 

 form we have seen from Subantarctic districts. 



Area of distribution: South Chile, Valdivia to Fuegia and Patagonia; 

 Atl. subantarctic islands; Masafuera. New Zealand and subantarctic islands. 



51. L. Gayanum Remy; Gay 6: 545. 



Subalpine and alpine heaths. Fertile in the autumn and winter. 



Masafuera: Stony heath in the highlands above the Mono and Pasto val- 

 leys, 1 100 — 1300 m, not uncommon (no. 416); C. del Barril, 740 m (no. 534). 

 — Discovered by SKOTTSBERG 1908, at the Correspondencia Camp. 



Baker, Fern Allies 29 regards L. Gayanum as intermediate between the 

 typical L. scariosum Forst. from New Zealand and its var. Jussiaei Desv. from 

 tropical America. We prefer to regard it as specifically distinct from both. 



Area of distribution: South Chile, Valdivia to the Guaitecas Islands; 

 Masafuera. 



Before the investigations of SKOTTSBERG, the known vascular cryptogams 

 of Juan Fernandez numbered 39 species; in 1908 3 species were added, and in 

 1916 — 17 9 more, giving 51 species as a total. Of these 36 species are com- 

 mon to Masatierra and Masafuera, 6 only found in Masatierra and 9 only in 

 Masafuera. Of the 51 species 17 are endemic in the islands (3 of these confined 

 to Masatierra and 1 to Masafuera). Two species are known elsewhere, but 

 represented by endemic varieties. Of the genera only one, Thyrsopteris, in 

 endemic. The percentage of endemic species is high, amounting to 33,3 %. 



