CHAEA BALTICA. 45 



GiESENHAGBN Untei'sucli. ii. d. Oharaceen, I, f. 12-17 (bulbils) (1902). 



Hy in Bull. Soc. Bot. France, LX, mem.l26, p. 35 (1913). 

 C.firma Agaedh Syst. Alg. introd. p. 28 (1824). 



KiJTZiNG Tab. Phyc. Til, t. 64, f. 1 (1857). 

 C. NoUeana Beaun in Ann. so. Nat. sei-. 2, 1, p. 354 (1834) ; in riora,. 

 XVIII, i, p. 62 (1835). 



KuTZiNG Tab. Phyc. VII, t. 64, f . 2 (1857). 

 C. Liljebladii Wallman Porsok syst. Charac. p. 86 (1856). Transl. 

 p. 72 (1856). 



ExsiccATA : — Aresohoug 44, 145, 244, 400 ; Braun, Rabenh. & Sfciz. 

 44, 96, 114 ; Fries IX, 100 ; Migula, Syd. & Wablst. 137-40 ; Nielsseu 

 37-40, 54-6 {fide Wahlstedt) ; Nordstedt & Wahlst. 35, 35 6, c, d, 36-40,- 

 103-5; Rabenhorst 260; Gr. & B.-W. 14, 15. 



Monoecious. Stem rather stout, internodes usually 

 1 J- twice the length of the branchlets, lower nodes often 

 much thickened ; roots often producing compound 

 bulbils. Cortex regularly diplostichous, the primary 

 series slightly larger than the secondary, the secondary 

 cells usually joining squarely. Spine-cells normally soli- 

 tary, occasionally geminate, usually shorter than the 

 diameter of the stem, rather stout, acuminate. Whorls 

 of 8-10 branchlets. Stipulodes of both series well 

 developed, about equal, usually long, tapering to a rather- 

 obtuse tip. Branchlets usually rather stout and in- 

 curved, of 6-8 segments, of which the upper 2-3 are 

 usually ecorticate, the ultimate cell usually long, narrow 

 acuminate. Bract-cells 5-7, all developed, variable in 

 length, none exceeding the fruit ; bracteoles longer. 

 Oogonium c. 1000 [j. long(excl. cor.), 650 (j. broad; spiral- 

 cells showing 14-15 convolutions ; coronula c. 200 ,a high, 

 350-400 \i broad, usually spreading. Oospore c. 700 [x 

 long, 500 (J, broad, black, showing 13-14 strong ridges, 

 prolonged downwards into a cage ; outer membrane thick, 

 semi-rigid, translucent, red-brown or chestnut-brown,^ 

 faintly and very finely gxanulated. Antheridium c. 500- 

 600 ji, in diameter. 



Habitat. — Lakes near the sea. 



Distribution. — England : Dorset, Little Sea, Stud- 

 land (J. C. Mansel-Pleydell). 



Scotland : Orkney, Loch Stenness, Mainland {F. C, 

 Crawford). 



