NECKERACEAE., 253 
and Aste a leaf may be more finely denticulate, bat there is no diffi- 
culty in finding some at least of the normal form and toothing. 
- > Tristan d’Acunha plant the leaves very shortly but 
acutely acuminate, the acumen rarely if ever half. twisted, and the 
denticulation is far finer, closer and more regular, though quite well 
marked. 
Now Stephenson’s plant while here ~~ inet showing leaves 
rather unusually finely toothed, has the acumen far longer than in 
the Tristan d’Acunha species, nearly always half. twisted, and nearly 
always coarsely toothed; in fact the greater number of the leaves are 
in these respects quite ‘normal P. aciculare. 
The authors make a good deal of the position of the leaf as a dis- 
tinctive character ; in P. aciculare spreading and only slightly reflexed 
from a very shortly erect base; in P. densifolium strongly reflexe 
d’Acunha plant does not exhibit it in anything like the degree one 
would expect from the descriptions; in fact I must frankly admit sal 
I was unable to detect it on the Kew specimens. However that m 
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character panei from the leaf direction, and neglected the form and 
toothing of ve acumen, which is far more marked and very charac- 
teristic. P. d nsifolium must pat y be removed from the New 
pai rig it appears, at present at least, to be endemic in Tristan 
d’Aeu 
NECKERACEAE. 
TRACHYLOMA Brid. Bryol. univ. ii, 277 (1827). 
Trachyloma planifolium (Hedw.) Brid. op. et loe. cit. 
Syn. Neckera planifolia Hedw. Sp. M., p. 206, t. 48 ee 
Hook. Muse. exot. t..23; Fl. N.Z. ii, 108; andb. N. 
p. 463. Neckera Trachyloma C.M. Syn apr Trachi iloma 
Menziesii Par. Ind., p. pels Tpaabeploies Helms C.M. i 
Hedwig., xxxvii, 171 (1898). 
There has been an attempt to distinguish two New Zealand species, 
one the original plant of Hedwig, the other that of Menzies described 
and figured y Hooker in the Muse. exot.; which Hooker himself 
eonsidered to i Hedwig’s species. C. Mueller in the glean has 
separated Menzies’ plant as Neckera Tr achyloma, but I am quite in . 
can to have the stems pin aa branched to he leaves 
smooth, not striate, the seta shorter, the lid seieal (the fruiting 
characters being deduced from Hed s) is Neckera 
Trachyloma has the stem unbranched for some distance in its apical 
region, the leaves indistinctly striate or plicate, the seta rather longer, 
the lid of capsule subulate. 
