16 Northern News. 
archegonia. The same is the case with /. ¢amariscz, and in 
both species the plants are always dioecious, so far as I have 
seen, and the males are produced very sparingly towards the 
upper edges of the patch, and are much thinner and smaller- 
leaved than the females. The antheridia are developed on 
special short branches, with the under leaves rudimentary or 
absent except at the base of the branch, and the side leaves 
(‘male bracts’ or ‘perigotiial leaves’) consist of two nearly 
equal lobes, which are joined below and curve towards each 
other to form a pocket; the lobule is not developed as a 
pitcher. In the axil of each of these leaves stand two anthe- 
ridia, as a rule, but the number varies from one to four 
(Fig. 6 A). The antheridium is somewhat egg-shaped, and is 
carried on a slender stalk. The cells forming the apical part of 
the antheridium wall are elongated (Fig. 6, B C), and when the 
ripe antheridium absorbs water these long cells swell up, sepa- 
rate from each other, and spring outwards (or perhaps. are 
forced out by the swollen antherozoid mother cells) and leave a 
wide opening through which the antherozoids escape. 
The archegonia are borne in terminal groups on the main 
axis and on short branches; each group contains, as a rule, 
only two archegonia, but three are often seen, and less 
frequently four. The first archegonium arises from the apical 
cell, the second from its youngest segment. The three seg- 
ments below grow out together and remain joined, forming a 
tube (perianth) which is at first narrow, but later widens at the 
base (where the growth takes place, as in ordinary leaves), 
and eventually forms a wide sac with a narrow tubular pro- 
longation (the earliest formed part) at the top. The perianth 
consists of a single layer of cells, except at the very base, which 
is two-layered ; in /. dilatata the outer surface bears numerous 
small projections (Fig. 6, D, E, F; Fig. 8). The leaves just 
below the perianth begin to grow in the usual way, but the two 
lobes become equally developed, or nearly so, and are usually 
triangular and more or less sharply pointed ; these ‘ involucral 
leaves’ or ‘female bracts’ bend over the developing archegonia 
and help in protecting and keeping them moist. 
(To be continued. ) 
elt 
Mr. W. Jerome Harrison favours us with a copy of his paper on ‘ The 
Desirability of Promoting County Photographic Surveys,’ read at the York. 
meeting of the British Association. (See ‘ Naturalist,’ September, 1906, 
p. 290.) With this is printed the remarks made in the discussion following 
the paper. 
Naturalist, 
