A REVIEW OF THE BRITISH CHARACEJE. 131 



the lowest joint of the branchlets corticate, but one of the Portimma 

 specimens in Dr. Moore's herbarium is larger, and is remarkable 

 for its very prominent stipulodes. (fig. 5a.) 



vi. C. polyacantha, Braun, R. &, S. Exs. 48 (1859); Braun, 

 Consp. Char. Europ. (1867), p. 6 ; Fl. Dan. (1867), t. 2746., 



Hippuris muscosis sub aqua repent in Hibemia, Pluk. Phytog. 

 (1691), t. 193, f. 6. 



0. pedunculate, Kiitz. Flora, 1834, i., p. 706 ? 



C. sptmdijlophuUa, Kiitz. Phyc. Gen. ; Tab. Phyc, vii., t. 68, f. 2. 



C. hispida, var. pseudo-crinita , Braun, Ann. So. Nat., 1834, 

 p. 355; Cosson & Germ. Atl. Flor. Par., t. 38, f. b 3. 



Stem rather stout, little branched. Primary cortical cells 

 more prominent than the secondary, which are joined obliquely. 

 Spine-cells many, long, slender, spreading, usually fascicled. 

 Internodes long. Whorls of 8-10 straight or slightly- incurved 

 branchlets. Stipulodes long, slender. Branchlets of 6-8 joints, 

 the upper 2 ecorticate. Bract cells 6-10 acute, whorled, longer 

 than the nucule. Nucules 3-4 on ' a branchlet, sometimes 2 

 together 12-13 striate. Coronula short, slightly spreading, 

 obtuse. Monoecious. (Tab. 208, fig. 6.) 



This is one of our most spinous species, and is usually very 

 much incrusted. It may be distinguished from C. hispida by its 

 smaller size, shorter branchlets, comparatively longer internodes, 

 much more densely crowded spine-cells, as well as by the 

 prominence of the primary cortical cells. The smaller forms, 

 when sterile, much resemble some states of C. aspera, but may be 

 separated from it by their fasciculed spine-cells. The secondary 

 cortical cells are sometimes so obliquely joined as to render it 

 almost triplostichous, thus presenting a passage to that group. 

 This species was first collected by Sherard in turf-bogs in Ireland, 

 and was figured from his specimen by Plukenet in 1691. It is an 

 uncommon species, and has only been found in Europe, chiefly in 

 the north. 



Ponds, fens, and turf-bogs. June. Cambridge; Yorks, N.E. ; 

 *ife; Cork (Shanagarry Bog); Galway, E. ; Mayo (Foxford). 



vii. C. hispida, Linn. Sp. PL (1753), ii., p. 1157; Fl. Dan. 

 (1764), vol. i., t. 154; Eng. Bot., 463 (1798) ; Wallr. Ann. Bot., 

 P- 187, t. 4; Bruzel., Obs. Char., pp. 9 and 20; Coss. & Germ. 

 Atl Flor. Par., t. 38, f. b; Gant. Oesterr. Char., p. 17, f. 14; 

 B ab. A. N. H. (1850), v., p. 89; Wallm. Act. Stockh., 1854, 

 P ; 308; Kiitz. Tab. Phyc, vii., t. 65-67; Braun, Consp. Char. 

 ™P., p. 5 ; Braun, E. & S. Exs. 2, 3, 49, 85, 117; Nordst. & 

 vVahlst. Exs. 55-61. 



U spinosa VaillantiL Rupr. Svinb. ad Hist. pi. Ross. (1846), 



P. 83. * J 



O. equi.srtina, Kiitz., Flora, 1834, i., p. 700; Tab. Phyc, vii., 

 l - 08, f. 1. 



Stem stout, rough, cortical cells irregular, more or less spiral, 



le se conclary larger and more prominent, upper part of stem with 



m *ny slender, acute, spreading spine-cells. Whorls of 9-11 







