TRE PTERIDOPHYTA OF THE JUAN FERNANDEZ ISLANDS 5 



through a strong lens, the margins of the outer parts of the segments are 

 irregularly toothed or crenate by outwards vaulted marginal cells, the external 

 wall being thick and hyaline. A similar feature was not found in a large 

 number of specimens of T. pyxidiferum sens. lat. examined. The numerous 

 specimens collected have all the same characteristic habit, with the outer seg- 

 ments of the pinnae very close. The diagnosis above was based on the larger 

 fronds; most of them are considerably smaller. 



Area of distribution: Endemic in Masatierra. 



3. T. exsectum Kunze, Anal. 47 tab, 29 f. 2 (1837); Hemsl. 69; Johow 

 1893: 44 f. 32, 1896: 173. — Syn. Hymenophyllum fuciforme Colla 1836: 33 

 tab. 63. 



In dense humid forests, epiphytic on trees and trunks of arboreous ferns, 

 and in damp recesses of the narrow gorges, among moss, hanging down from 

 the rocks. (Fertile Jan. — April.) 



Masatierra: C. Chifladores, above the innermost part of the Frances 

 Valley, c. 500 m; ridge between Q. Laura and Q. Piedra agujeriada, on Dick- 

 sonia 650 m (no. 595); C. Centinela, on fern trees 560 m; El Pangal, wet forest 

 in the gorge (no. 1130); B. Cumberland, in Cave VI, forming a beautiful pure 

 carpet on the vertical walls (no. 598; also JoHOW); Q. juanango, under fallen 

 trunks (no. 608); Q. Villagra, mountain spur W. of El Yunque, c. 500 m. 



Masafuera: Q. del Mono, c. 475 m; Q. de las Casas, under overhanging 

 rocks in the canyon (no. 450, also Johow); Q. del Blindado, 440 m; Q. de 

 las Vacas (JOHOW). 



The nearest ally of this pretty species, that reaches 40 cm in length, is 

 T. tenerum Spr., widely spread through tropical America. 



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



Serpyllopsis v. d. Bosch 



4. S. caespitosa (Gaud.) C. Chr. Arkiv for Bot. 10: 29 c. fig. (1910). — 

 Syn. Hymenophyllum caespitosum Gaud. Ann. sc. nat. 5: 99 (1825); Freyc. Voy. 

 Bot. 374 tab. 5 f. 2 (mala); Trichomanes caespitosum Hook. Sp. Fil. 1: 132 tab. 

 40 B; C. Chr. Ind. 637; Serpyllopsis antarctica v. d. Bosch Ned. Kr. Arch. 

 4: 377 (1859). 



Var. fernandeziana C. Chr. et Skottsb. nov. var. 



This interesting moss-like fern was first detected in the islands by SKOTTS- 

 BERG, 1908. In 1910 C. CHRISTENSEN referred the specimens of the 1908 

 collection to var. densifolia (Phil.) C. Chr. 1. c. 30 [Hym. densifolium Phil. 

 Linn. 29: 108, 1857), which was collected in the Guaitecas Islands and presum- 

 ably is not rare in the humid forests of the Chilean Archipelago. The specimens 

 from Juan Fernandez were sterile; now we have a beautiful lot of specimens, 

 some of which are fertile, and an examination of the sori has proved that we 



