174 Till: VOYAGE OF H.M.S. CHALLENGER. 



Bryum truncorum, Brid. 



Bryum truncorum, Brid., Mant. Muse, p. 119 ; C. Miill.. Synop. Muse. Frond., i. p. 251. 



Tristan da Cunha and Inaccessible Islands. Moseley. 

 South Africa and Mascarene Islands. 



Bryum megalacrion, Sehwiigr. 



Bryum megalacrion, Sehwiigr., Suppl. i. 2, p. 104, t. 71 ; C. Miill., Synop. Muse. Frond, i. p. 312. 



Tristan da Cunha. — Forming wide patches ; specimens bearing only old capsules and 

 in a bad state — Moseley. 



Mauritius and Kodrimiez. 



Bryum julaceum, Sm. ? 



Bryum julaceum, Sm., Fl. Brit., p. 1357? C. Miill., Synop. Muse. Frond., i. p. 315, et. ii. p. 577. 



Tristan da Cunha. Moseley. 



Some very small barren stems belong to this or some very closely allied species. 



Daltonia sp. 



Tristan da Cunha. Moseley. 



A single fragment proves the existence of a species which cannot be determined. 



Stereodon cupressiformis, Brid. 



Stereodon cupressiformis, Brid., Bryol. Univ., ii. p. 605; C. Miill., Synop. Muse. Frond., ii. p. 289. 

 Hypnum cupressiforme, Linn., Sp. PL, ed 2, p. 1592. 



Tristan da Cunha. — Barren. Moseley. 



In some form this species appears to be present throughout the world ; but it seems to 

 be more abundant in Europe than elsewhere. 



Ptychomnion densifolium, Mitt. 



Hypnum densifolium, Brid., Sp. Muse., ii. p. 201 ; C. Miill., Synop. Muse. Frond., ii. p. 412. 



Tristan da Cunha. — Endemic. Thouars; Moseley. 



As usual, all the specimens are barren ; it closely resembles Ptychomnion aciculare, but 

 its foliage is more dense and more recurved. 



Meiothecium urceolatum, Mitt. 



Pterogonium urceolatum, Sehwiigr., Suppl. ii. 1, p. 33, t. 110. 

 Neckera urceolata, C. Miill., Synop. Muse. Frond., ii. p. 77. 



Tristan da Cunha.— Endemic. Thouars. 



