A REVIEW OF THE BRITISH CHARACE.E. 101 



Division L— CHAKJE. 



* 



Whorls of branchlets with 1-2 circles of small usually elongated 

 cells at their base (stipulodes). Internodes composed of a simple 

 tube only, or with a cortex of elongated cells growing upwards and 

 downwards from the base of the branclilets in longitudinal rows, 

 each branchlet producing either one, two, or three rows. Cortical 

 cells often bearing small papillate, or aciculate cells (spine-cells), 

 which are either appressed or spreading. Branclilets of many 

 decreasing segments, the last being a small conical cell ; the lower 

 segments usually having cortical cells, and bearing at their joints 

 whorls or partial whorls of elongated cells (bract-cells), and on 

 their inner side, at the nodes, nucules and globules, which are 

 usually solitary. I ' oronula of 5 equal cells, persistent. 



1.— CHARA. 



Stem and branclilets ecorticate or corticate. Eing of 



stipulodes in one or two circles. Globule situated below the 



nucule taking the place of the centre bract-cell. Coronula 

 prominent. Monoecious or dioecious. 



? 1. Triplostich.e — Stem with 3 rows of cortical cells to each branchlet. 



i. C. fragilis, Desv. in Loisel. Not. (1810), p. 137; Coss & 

 Germ. Atl. Fl. Par. (1845), t. 38, f. c. ; Gant. Oesterr. Char. (1817), 

 p. 20; Bab. A. N. H., 1850, p. 91 ; Wallm. Act. Stockh., 1854, 

 p. 329 ; Kiitz. Tab. Phyc. (1857), vii., t. 54 ; Braun, Consp. Char. 

 Europ. (1867), p. 7; Fl. Danica (1869), nos. 2796-8; Braun, 

 R. & S. Exs. 13, 15, 112, 115 ; Nordst. & Wahlst. Exs. 116-7, 

 120. 



O. qlobularis, Thuill. Flor. Par. (1799), p. 472. 



C. pulchella, Wallr. Ann. Bot. (1815), p. 184, t. 2; Berkeley 

 E. B. S, 2824. 



C pilifera, Ag. Syst. Alg. (1824), Introduction, p. 28. 



C. hirta, Meyen. Linnaea, 1827, h\, p. 78? 



G. virgata, Kiitz. Flora, 1834, i., p. 705. Tab. Phyc, vii., 

 t. 56, f. 2. 



C. diffusa, Wallm. in Liljeblad Svensk Flora, ed. hi. 



Stem slender, but little branched, sometimes with granular 

 calcareous bulbils at the lower rooting nodes, very regularly and 

 evenly corticate, without spine-cells, whorls of 6-9 branclilets. 

 Lower circle of stipulodes very short. Branchlets of 7-9 joints, 

 tiic upper 1-2 ecorticate. Bract-cells on the inner side of the 

 branchlets, usually 4, about equalling the nucule in length. 

 Nucule ovoid, 12-14-striate coronula long, somewhat conical; 

 nucleus black, sometimes covered with a calcareous deposit. 

 Globule smaller than the nucule. Monoecious. (Tab. 207, fig. 1.) 



b. barbata, Gant. Oesterr. Char. (1847), p. 20, t. 2, f. 15. 

 ■—C.fraailis, var. hmqibracteata, Rabenhorst, Deutschl. Krypt. Flor., 

 d. (1847), p. 200.— C. triciwdrs, Kiitz. Flora, 1834, i., p. 705 ; 

 Tab. Phyc. vii. (1857), t. 56, f. 1.— Bract-cells 2-3 times as long as 



