34 BRITISH CHAROPHYTA. 



Agardh Syst. Alg. p. 127 (1824). 



BiscHOPF Krypt Gew. t. i, f . 16 (1828) ; Handb. bot. Term, und 



Syst. f. 2816 (1842). 

 Beaun in Ann. so. Nat. ser. 2, I, p. 355 (1834) ; in Flora, XVIII, i, 



p. 6.5 (1835) ; in N. Denks. Allg. Scbweiz. X, p. 18 (1849) ; in Cohn, 



Krypt. PI. Scbles. I, p. 404 (1876). 

 KiJTziNG Phyc. Germ. p. 260 (1845) ; Sp. Alg. p. 526 (1849) ; Tab. 



Phyc. YII, t. 73 (1857). 

 Rabenhoest Deutscb. Krypt. Fl. II, p. 198 (1847). 

 Wallman Forsok syst. Oharac. p. 90 (1853) ; Transl. p. 75 (1856). 

 Ganteebe OsteiT. Char. p. 16, f. 10-11 (1847). 

 Wahlstedt Bidr. Skand. Charao. p. 34 (1862). 

 LEONHAEDiin Verb. Natm-f. ver. Brunnll, p. 197 (1864). 

 MiTLLBE in Bull. Soc. Bot. Geneve, II, p. 60 (1881). 

 Beatjn & NoRDSTBDT Frag. Men. Charac. p. 139 (1882). 

 Sydow Europ. Obarac. p. 66 (1882). 

 MiGTJLA Die Cbaraceen, p. 386, f. 92-5 (1892) ; Krypt. Fl. Deutsch. 



II, ii, p. 292, t. 68 (1907) ; Syn. Obarac. Europ. p. 88, f . 77-80 (1898). 

 WiLLE in Engl. & Prantl. Nat. Pfl. fam. I, ii, p. 176, f. 128 B (1891). 

 HoLTZ in Krypt. Mark. Brandenb. IV, i, p. 93 (1903). 

 Peospee Carofit.Espan. p. 112, f. 20 b (1910). 

 Hy in Bull. Soc. Bot. France, LX, mem. 26, p. 28 (1913). 



ExsiccATA :— Ai-escboug 43, 127, 296 ; Braun, Rab. & Stiz. 8, 9, 35, 

 36 ; Fries V, 100 ; Groves 40, 41 ; Jack, Lain. & Stiz. 218, 219 ; Migula, 

 Sydow & Wablst. 37, 69, 60, 89, 133 ; Nielssen 19, 20 {fide Wablst.) ; 

 Nordstedt & Wablst. 30, 31, 35, 36, 50, 50 6, 54, 88, 89 ; Rabenborst 70, 

 340 ; Reicbenbacb 92 ; Gr. & B-W. 11, 12. 



DicBcious. Stem stout, the internodes usually l| to 

 twice the length of the branchlets. Cortex irregularly 

 diplostichous, the primary series much the larger and 

 more prominent ; spine-cells solitary or clustered, 

 varyiag considerably in size, broadly ovoid-apuminate. 

 Whorls of 6-8 branchlets. Stipulodes of both series 

 developed, broadly ovoid-acuminate. Branchlets sfcout, 

 usually somewhat incurved, when well developed of 

 4-6 long segments, of which the 1-3 upper are ecorticate 

 and often much swollen, the lowest segment with a 

 partial irregular ascending as well as a descending 

 cortex. Bract-cells normally 5, broadly ovoid acuminate, 

 the anterior longer than the fruit, the posterior usually 

 developed and often nearly as long as the anterior. 

 Bracteoles and bractlet variable in length, often as long 

 as the anterior bract-cells. Oogonia and antheridia 

 solitary or the latter occasionally geminate, produced 

 at the 2-3 lower nodes. Oogonium c. 1000 \i long (excl. 

 cor.), 800 [i broad ; spiral-cells showing about 15 con- 



