llll: l'l KKllxiI'm I A OF THE JUAN FERNANDEZ ISLANDS 17 



secondary and tertiary pinnules. Besides the woolly hairs, the form from Masa- 

 tierra shows numerous rather rigid, cylindrical, atropurpureous hairs. We have 

 met with similar trichomes only in the Mexican form described as Trichosorus 

 glaucescens Liebm., but in this they are very few while in the form from Masa- 

 tierra they are so numerous as to give the lower surface of the frond a quite 

 peculiar appearance. 



Area of distribution: Mexico, Central and South America to Western 

 Patagonia, 49 S. L. Juan Fernandez. 



Dicksonia L'Her. 



18. D. Berteriana (Colla) Hook. Sp. Fil. 1: 67 tab. 23 A et auctt.; 

 Hemsl. 66; Johow 1893: 21 f. 3, 1896: 154 tab. 16—17. — Syn. Davalha Ber- 

 teriana Colla 1836: 27 tab. 65; Balantium Berteroanum Kze Anal. 40 (1837). 



In the humid and protected gorges found as low as 2 — 300 m; on the 

 forested slopes and ridges generally not seen below 400 m, becoming much 

 more numerous higher up. In the region of the frequent fogs this stately fern 

 forms very dense groves. Fertile in the autumn and winter. 



• Masatierra: C. Ghifladores, plentiful above 500 m; Q. Laura and Q. 

 Piedra agujeriada, from 400 m upwards; higher parts of Rabanal, common, 

 solitary specimens as low as 450 m; C. Centinela, stray specimens in the 

 brushwood, numerous in the woods above 500 m (no. 574); Pangal, in the gorge, 

 fine trees observed as low as at 220 m; on the crest above the Pangal canyon, 

 c. 800 m; V. Anson, fine trees on the slopes of La Damajuana (common from 

 500 m upwards) and of El Yunque (large specimens from 385 m, but now be- 

 coming rare; 1 C. Central, from 390 m and upwards, rare; V. Colonial, Q. seca, 

 one tree seen at 435 m; C. Salsipuedes, filling the uppermost part of Q. He- 

 lechos, 660 — 450 m, with an almost pure and exceedingly beautiful stand; Pto 

 Ingles, high up on the western slope (SKOTTSBERG 1908); Q. Villagra, mountain 

 spur W. of El Yunque, c. 500 m, frequent ;• below the Portezuelo pass, not un- 

 common above 500 m; Q. de la Choza, solitary specimens at the altitude of 

 300 m, higher up more common. 



The typical form of this endemic' species seems to be confined to Masa- 

 tierra. It is so closely related to D. lanata Col. from New Zealand that a person 

 working with dried material only might be inclined to unite them. 



var. virgata C. Chr. et Skottsb. nov. var. — Johow 1896 tab. 17. 



Major, robustior, ad 6V2 m (vel ultra?) alta et 1 m diam. supra basin et 

 infra ramos, saepe virgata, ramis 1—5 irregulariter dispositis. Pinnae soriferae 

 ad 40 cm et ultra longae (in typo rarius ultra 20 cm), minus villosae. Sori 

 conspicue majores, 2 mm diam. (in typo I — 1,2 mm). 



Plate 2. 



1 Not few plants are dug out every year and sold to be transplanted in the gardens of 

 Chile, where they do not thrive. 



2 — 20206. The Nat. Hist, of Juan Fernandez and Easter I si. Vol. II. 



