14 CARL CHRISTENSKN AND CARL SKOTTSBERG 



Area of distribution: South Chile, Valdivia to Fuegia; Juan Fernandez. 

 *I3. H. secundum Hook et Grev. Ic. Fil. tab. 133 (1829); C. Chr. Ind. 367. 

 (Poorly fertile, Feb.) 



Masafuera: Las Torres, edge of the western precipice, 1370 m (no. 475). 

 New to the islands. The specimens are small but otherwise typical. By 

 the entire valves of the indusium surely to be distinguished from II. rugosum. 

 Area of distribution: South Chile, Valdivia to Fuegia; Masafuera. 



14. H. dichotomum Cav. Descr. 276 (1802); Hook. Sp. Fil. 1: 98 tab. 

 36 A et auctt.; Hemsl. 67; Johow 1893: 40 (pro parte?, certe non f. 27), 1896: 

 169 (pro parte); C. Chr. Arkiv for Bot. 10: 27 (1910). — Syn. H. nigricans 

 Colla 1836: 32 tab. 62. H. polyanthos Johow 1893: 42 (pro parte?) f. 29, 1896; 

 171 (pro parte?) 



Probably fertile at almost any season. One of the commonest species, 

 found on the low, dry slopes of western Masatierra as well as in the central 

 and eastern parts, where it is frequently met with in the wooded region from 

 its lower limit to the highest ridges; also common in Masafuera. It grows on 

 the soil, on stones or on trees, both fallen and living ones. 



Masatierra: eastern and central parts, common (nos. 45, 218, 571, 593, 

 1 133, 1 134); the dry western part: ridge SW of Co Tres Puntas, 300 - 350 m, 

 under stones (no. 1132), and in the bottom of dried-up ravines (no. 1132 b). 



Masafuera: Q. del Mono, on trees, 475 m (no. 390); Q, de las Casas, in 

 the canyon (no. 451); Q. del Blindado, common in the forest 440 m; Dicksonia- 

 grove on the lower slope of Los Inocentes, above Q. del Varadero, c. 950 m; 

 Q. Loberfa, between blocks in the streem, 180 m (no. 480). 



This common species varies considerably in size and shape of the frond, 

 measuring from 2 — 3 to 20 cm in length, in shape broadly ovate to lanceo- 

 late, but all forms have the very characteristic plicate frond of a dark green 

 colour. Young leaves have distinct brown, crisped wings along the stipe, much 

 narrower, however, than those of H. tortuosum; these wings are shed early so 

 that older leaves have an unwinged stipe. The marginal teeth are much 

 shorter than in H. tortuosum. The sori are confined to the upper third of the 

 frond (which is often more or less contracted), where they are numerous. The 

 ovate-subacute, frequently apiculate valves of the indusium are entire and 

 faintly or not at all spinose on their back, as described and figured by HOOKER. 

 The large brown sporangia are exserted in the mature sorus. The smaller 

 forms have the leaves very much contorted and look peculiar when compared 

 with the larger ones. 



We think that H. nigricans Colla is this species; at least BERTERO's spe- 

 cimens in Herb. Kew (!) under this name clearly belong here and not to H. 

 tortuosum to which Gay referred Colla's species. 



Evidently this species has been largely confounded with others. It is 

 perhaps the most common of the genus in the islands, but, nevertheless, JOHOW 

 only quotes other collectors and not himself, this because he misunderstood 

 the species, for his fig. 29, 1893, is not »H. polyanthos», but II. dicJiotomum, 



