408 FLOKA ANTARCTICA. \_Fuegia, the 



Hab. Amsterdam Island, South Indian Ocean, Lieut. Smith, R.N. 

 Found also in Campbell's Island. 



15. DIDYMODON, Hedw. 



1. Didymodon cajnllaceus, Web. et Mohr, Bot. Tascli. p. 155. Hook, et Tai/l. Muse. Brit. p. 119. 

 t. 20. Swartzia capillacea, Hedw. Muse. Frond, vol. ii. p. 26. 



Hab. Hermite Island, Cape Horn ; on sandy banks near the sea, St. Joachim's Bay. 



2. Didymodon longifolius. Trichostomum longifolium, Brid. Br. Univ. vol. i. p. 496. Trichostomum 

 pallidum, 0. strictum, Schvaegr. Supjil. II. vol. i. p. 77. 1. 123 ? 



Var. 2. tenuifolius ; foliis basi magis dilatatis membranaceis, nervo duplo latiore. 



Var. 3. penicillatus ; caule fastigiato-ramoso, foliis longioribus erectis subquadrifariam imbricatis, nervo 

 crassiore. 



Var. 4. curvifolius ; foliis subfalcatis secundis, e basi latiore sensim angustatis. 



Hab. Staten Land, A.Menzies, Esq. (1787). Hermite Island, Cape Horn, vars. 1 and 4, abundant. 

 South part of Fuegia, C. Darwin, Esq. Falkland Islands, var. 2, on the ground, rare in fruit ; var. 3, on 

 stones in streams, (barren). 



From Trichostomum pallidum our moss differs essentially in the inflorescence, in the dilated base of the leaf, 

 stronger nerve, cylindrical capsule, and also in the structure of the peristome. The var. 2 has at times an elliptical 

 theca. 



3. Didymodon ? glacialis, Hook. fil. et Wils. ; caule ramoso fastigiato-crespitoso, foliis erecto-patentibus 

 apice incurvis fragibbus ovato-lanceolatis lineari-acuminatis sobdinerviis. (Tab. CLII. fig. VI.) 



Hab. Cockburn Island, lat. 64° S. 57° W. (barren). 



Caules 4 lin. longi, ramis erectis. Folia e basi concaviuscula, repente in acumen lineare producta, vel nervo 

 crasso longe excurrente, margine baud reflexa, areolis minimis, subrotundis, inferioribus majoribus pellucichs, e fusco 

 lurido-viridia. 



One of the only three mosses which have hitherto been detected hi a higher latitude than that of Cape Horn. 



Plate CLII. Fig. VI. — 1, tuft of the natural size; 2, branch; 3, 4 and 5, leaves: — all ■magnified. 



16. CEKATODON, Brid. 



1. Ceratodon ju^-WM-m, Brid., Br. Univ. vol. i. p. 480. Fl.Antarct. pt.l. p. 131. Didymodon, Hook, 

 et Tayl. Muse. Bot. p. 113. t. 20. 



Hab. Strait of Magalhaens, 31. Jacquinot (in D'Urville's Voyage). Falkland Islands, common on 

 clay soil and on the sand-hills about Port Louis. Not seen on Hermite Island. 

 A very abundant Antarctic plant in many situations. 



17. TOETULA, Hedw. 



We retain this name, instead of Barbula, for the following reasons : Sckreber is the first authority for the union of 

 the two Hedwigian genera Tortula and Barbula in the year 1791 (Gen. Plant.)- He adopted the name Tortula which 

 stands first in Hedwig's arrangement for both. This fact is overlooked by Bruch and Schimper, who in their history 



