Conducting Tissue-System in Bryopkyta. 1 1 
to add to Farmer’s description. Some of the hydroids, as seen 
under a xx inch oil immersion, are shown in Fig. 4, and it 
will be clear that the pits are simple and quite normal, not 
specially f shallow.’ 
Symphyogyna. Schiffner gives two sections, Repentes and 
Erectae y according to the difference of habit already men- 
tioned. Of the former we have examined vS. sinuata from 
Trinidad, and .S'. Brasiliensis from an elevation of 4,000 feet 
in Bolivia (Figs. 5 and 6). So far as can be made out from 
scanty herbarium- material the former is closely adherent to 
the soil along the whole length of its midrib, and has numerous 
root-hairs all over the ventral surface of the rib, while the 
latter has no root-hairs along its upper parts, which are 
quite free. Certainly 5 . Brasiliensis has a very much bulkier 
strand than 5 . sinuata , with wider thin-walled elements at 
the periphery, and narrow thick-walled cells in the centre. 
vS. trivittata from Dominica has already been described and 
figured by Spruce (op. cit., p. 365, Plate XXX). The three 
strands, though not individually very bulky, must afford 
between them a considerable conducting channel. Here there 
is a certain differentiation into rhizome and frond, such as one 
often gets in P. Lyellii (cf. Farmer, op. cit., p. 35), and no 
rhizoids are to be found on the frond. 
Of the section Erectae we have^ examined S', podophylla 
from the Devil’s Peak, and also from Kooksbosch, S. Africa, 
S. Hymenophyllum from New Zealand, and S. rhizobola 
(Figs. 7 and 8), all with dichotomously branched fronds on 
long stalks. The frond-stalks of all three have stout strands, 
which may be circular or slightly flattened in the plane of 
the frond, and their elements are well provided with pits 
of the usual type. The rhizome of S. rhizobola y the ventral 
surface of which is covered with rhizoids (Fig. 8), has a dis- 
tinctly weaker strand than the frond -stalk (Fig. 7). 
Hymenophy ton. H. Phyllanthus (New Zealand) has the 
habit of Pallavicinia Lyellii , and its somewhat flattened basal 
rhizome-like portion has a small compact strand (Fig. 9). 
H . flabellatum (New Zealand) has a very long stalk to its 
