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



In favourable conditions this forms very extensive patches, and in the absence of fruit 

 it exactly resembles the smaller species of Thuidium. 



Thuidium plumulosuna, Mitt. 



Ilijpnum plumulosum, Dozy et Molk. in Ann. Sci. Nat., 1844, p. 308 ; C. Mull., Synopsis Muse. Frond., 

 ii. p. 48G. 



Admiralty Islands. — Barren stems. "Widely diffused in the Malayan Archipelago. 



A very elegant moss, in its dioecious inflorescence and general appearance most similar 

 to the section of the genus containing the larger species ; but its seta is rough, a character 

 otherwise confined to the section containing the smaller and monoecious forms. 



HEPATIC^. 1 

 Plagiochila longispica, Mitt. 



Plagiochila longispica, Mitt, in Seem. Fl. Yit., p. 407. 



Admiralty Islands. — Elsewhere only from Samoa. 



The specimens entirely agree with those from Samoa, with the exception of one tuft 

 of male stems, on which the apices of the saccate leaflets enclosing the antheridia are 

 slightly toothed ; all the other specimens, like those from Samoa, have this portion entire. 

 The spikelets of the male inflorescence vary from one or two to three, and these are simple 

 and much elongated (2 cm.), or they are dichotomous and even trichotomous, with the 

 divisions divaricate, and disposed in fan-shaped order. Unlike the Samoan Plagiochila 

 auriculata, Mitt., loc. cit., p. 408, which is closely allied to Plagiochila blejyharojihora, 

 Nees ab E., and Plagiochila bantamensis, ejusd. Syn. Hep., p. 39, Plagiochila longisjrica 

 in its habit and appearance is much more like the West Indian Plagiochila macrostachya, 

 yet in stature it is much smaller, and it is a true member of the small section with 

 cucullate ventral ancles to the leaves. 



s 



Chiloscyphus coalitus, Nees. 



Chiloscyphus coalitus, Nees in G. L. et N. Synopsis Hepat., p. 180 ; Mitt, in Seem. Fl. Yit., p. 409. 

 •I ' iiinji rmannia coalita, Hook., Muse Exot., t. 123. 



Admiralty Islands. 



In a barren state ; fertile specimens are uncommon, and it is quite impossible to be 

 sure that some specimens referred to this species on account of their leaves being combined 

 in the same manner with the amphigastrium are truly identical, or if they are species of 

 Lophocolea with the same arrangement, the similarity being very close in size and form. 



1 By William Mitten, A.L.S. 



