170 THE VOYAGE OF H.M.S. CHALLENGER. 



Acrostickura succisaefolium, Tliouars. 



Acrostichum mccisasfolium, Tliouars, Esquisse Fl. Trist., p. 30; Carmich. in Trans. Linn. Soc. Lond., 

 xii. p. 510; Hook., Sp. FiL, v. p. 241 ; Hook, and Grev., Ic. Fil., t. 2 ; Kuhn, Fil. Afr., p. 48; 

 Hook, and Bak., Synop. FiL, p. 408. 

 Olfersia succiscefolium, Presl., Tent. Pterid., p. 235. 

 Elaphoglossum succiscefolium, Moore, Ind. Fil., p. 368. 

 Acrostichum ciliatum, Desv., Journ. Bot., iii. p. 273. 

 Acrostichum macrqpodium, Carmich. MSS. in Herb. Kew. 



Tristan da Cunha. — In the wood — Carmichael ; without note — MacGillivray and 

 Milne; Moseley. Inaccessible and Nightingale Islands. Moseley. 



Thouars records this species from Mauritius, but we have seen no specimen from that 

 island. It is abundant, however, in Amsterdam Island. 



OPHIOGLOSSACE^E. 



Opkioglossum vulgatum, Linn. 



Ophioglossum vulgatum, Linn., Sp. PL, ed. 1, p. 10G2, var. ; Hook, and Bak., Synop. FiL, p. 445. 

 Opkioglossum opacum, Carmich. in Trans. Linn. Soc. Lond., xii. p. 509 ; R. Br. ex Kuhn, Fil. Afr., p. 178. 

 Ophioglossum bulbosum, Baker in Trans. Linn. Soc. Lond., xxvi. p. 344, non Michx. 



Tristan da Cunha. — High up on the dome — Carmichael. 



Taken in the wide sense assigned to it in Hooker and Baker's S} T nopsis Filicum, this 

 is perhaps the most widely spread of all ferns, both in cold and warm countries ; but the 

 form found in Tristan da Cunha and St Helena is a very distinct one in appearance, and 

 if constantly so deserving of specific rank. 



Kuhn (1. c. p. 1 79) records, on the authority of Mettenius, Opkioglossum reticulatum, 

 Limi., from Tristan da Cunha ; but this seems to have arisen from some error. 



CRYPTOGAMS— CELLULARES. 



MUSOI. 1 



Physcornitrium (Aphanoregma) breviseturn, Mitt. 



Physcomitrium (Aphanoregma) breviseturn, Mitt, in Journ. Linn. Soc. Lond., xv. p. 65. 



Inaccessible Island. — Growing on the ground — Moseley. 



Caulis innovationibus repetitis dichotome ramosus. Folia superiora obovato-oblonga, 

 acuta vel brevissime apiculata, nervo infra apiceni evanido, margine apicem versus serrulata, 



1 By William Mitten., A.L.S. 



