132 BRITISH CHAHOPHYTA. 



of the whorls, in the latter case often in considerable 

 numbers ; broadly-ellipsoid-biconical, c. 500 p. long, 

 400 fji broad, spiral-cells showing 11-12 convolutions, 

 not swelling at the apex ; coronula c. 30 ^ high, 60 p, 

 broad, persistent, the cells of each tier of about equal 

 size. Oospore light golden yellow, c. 350 JJL long, 275 ^ 

 thick, showing 9-10 very thin prominent often winged 

 ridges ; outer membrane very thin and flexible, light 

 yellow, translucent, very finely granulate (PI. V, f. 10.) 

 Antheridia stalked or sessile produced at the nodes 



JL 



and at the base of the branchlets, c. 400 p. in diameter. 



HABITAT. Usually in shallow pools and ditches; 

 rare, and apparently often sporadic in its appearance. 



DISTRIBUTION.- -England : Somerset, N., near Lang- 

 port (E. 8. Marshall); Surrey, Egham (W. H. Beely); 

 Essex, N. (E. G. Varenne) ; Herts, near Broxbourne 

 (T. B. Blow) ; Middlesex, near Staines (/. G.) ; Oxon, 

 Marston (G. G. Druce) ; Suffolk, W., near Bury St. 

 Edmunds (G. R. Leathes) ; Carnbs, Haslingfield (G. C. 



Beds, near Luton, near Brammingham, and near 

 Totternhoe (/. Saunders) ; Hunts, St. Neots (W. R. 

 Linton) ; Northants, Yardley Gobion (G. C. Druce) ; 

 Gloster, W., near Newent Canal (0. St. Brody) ; Yorks, 

 S.E., near Beverley (G. Waterfall), Yorks, S.W., 

 near Goole (T. R. Birks, Jr.) ; Yorks, N., Dalton 

 (J. Comber) \ Durham, Sedgefield (A. M. Norman). 



Ireland : Dublin Co., Grand Canal, Glasnevin (D. 

 Moore) ; Blanchardstown (D. McArdle). 



First record : Babington, 1850. 



There is a specimen in Herb. Buddie (British 

 Museum), but no locality is given on the label. 



Outside the British Isles T. intricata is recorded 

 from Sweden, Denmark, France, Belgium, Holland, 

 Germany, Switzerland, Hungary, Italy, and Rumania ; 

 also from North Africa (Algiers). 



A rather large plant, sometimes attaining a height of 40 cm. 

 When well-grown, young, and not incrusted, it is a beautiful 



