58 BRITISH CHAROPHYTA. 



primary and secondary cortical-cells of equal diameter. 

 Spine-cells quite rudimentary. Whorls of 6-9 branchlets. 

 Stipulodes rudimentary. Branchlets rather rigid, strongly 

 incurved, especially in the male plant, usually of 8-9 

 segments, the upper 1-2 ecorticate. Bract-cells normally 

 7, one pair only developed, short, bracteoles and bractlet 

 elongated, but shorter than the fruit. Oogonia and 

 antheridia solitary, usually produced at the lowest 

 2-3 nodes. Oogonium narrowly ellipsoid, c. 750 (jl long 

 (excl. cor.), 400 \l broad ; spiral-cells showing 13-14 

 convolutions ; coronuh, c. 200 [x long, 185 ,u. broad, the 

 cells strongly connivent and tapering to the apex. 

 Oospore nearly cylindrical, very truncate below, c. 500- 

 600 [I long, 250-300 n broad, very dark brown to black, 

 showing 12-13 faint ridges, terminating in inconspicuous 

 basal claws ; outer membrane thick laminated, semi- 

 rigid, opaque, dark red-brown, granulated, with clearly- 

 dfefined, very numerous but non-contiguous granules. 

 Antheridium large, c. 600-700 (x in diameter. 



Habitat. — In pools, lagoons, etc., near the sea, in a 

 few scattered localities, and by no means plentiful. 



Distribution. — England: Devon, S., SlaptonLey, W. 

 Curnow and W. B. Waterfall, 1878. Still there in 1916. 



Hants, S. In fresh-water ditches at Stokes Bay, 

 Gosport, W. S. Bayton. 1828, Herb. Borrer. 



Suffolk, E., Benacre Broad, G. R. B.-W., 1897. 



Norfolk, E., Heigham Sound, J. E. Bidgood, 1889 ; 

 Hickling Broad, G. R. B.-W., 1901, Martham Broad, 

 C. E. Salmon and J. W. White, 1915. 



Ireland : Wexford, lagoon, north of Wexford Harbour, 

 E. S. Marshall, 1896. 



Gralway, W. and Mayo, E., between L. Mask and 

 L. Corrib, C. Bailey, 1885. 



First record : ' Journ. Bot.' 1878. 



Outside the British Isles C. connivens is recorded from 

 Spain (Central), France, N.W., Central & S., Germany, 

 N.B., Italy and Austria, in North Africa (Morocco to 

 Egypt), and in Palestine. 



