100 BRITISH CHABOPHYTA. 



N. peduncidata AaAEDH Syst. Alg. p. xxvii {182i), fide Braun. 

 C. syncarpa AxrcT. plue. {non Thuill.). 

 E.BICHENBACH Iconogr. f. 1078-1079 (1830). 

 Babington in Ann. and Mag. Nat. Hist. ser. 2, "V, p. 83 (1850). 

 C. capitata var. opaca Bkaun in Ann. Sc. Nat. ser. 2, I, p. 352 (1834). 

 C. syncarpa var. pseudo-flexilis Beaun in Flora, XVIII, i, p. 61 (1835). 



Ganteebe Osterr. Ciiar. p. 9 (1847). 

 C. syncarpa var. opaca BEAxrisr in Flora, XVIII, i, p. 52 (1835). 

 C. syncarpa var. SmitJni Cosson, Germain & Weddell, Introd. Fl. 



Par. p. 151 (1842). 

 N. syncarpa var. Smithii OossoN & Geemain, Fl. Par. p. 682 ; Atl. 



t. 39, f. 7-12 (1845). 

 JV. syncarpa var. opaca KtfTziNG Phyc. Germ. p. 266 (1845). 



BoswELL Engl. Bot. ed. 3, XII, p. 178, t. 1900 (1884). 

 N. syncarpa vars. pseudqflexilis and opaca Rabenhoest Deutsoh. 



Krypt. Fl. II, p. 195 (1847). 

 N. syncarpa vars. opaca, laxa, glomerata, and pachygyra Beaun in N. 



Denks. Sohweiz. Ges. Naturw. X, p. 7 (1849). 

 N. atrovirens Wallman Forsok syst. Oharac. p. 36 (1863) : Trans! 

 ~ p. 30 (1856). 



ExsiccATA :— Areschong, 149 ; Billot, 3272 ; Braun Rab. & Stiz., 29, 

 51-63, 77, 105, 106 ; Groves, 28, 29, 60 ; Migula Syd. & Wahlst., 33, 

 34, 52; Mougeot & Nestl., 1278; Nielsen, 4 {fide Wahlst.); Nord- 

 stedt & "Wahlst., 5-7 ; Westendorp & Wall., 1397. 



Dioecious. Stem moderately stout ; internodes 

 usually 2-4 times the length of the branchlets. Sterile 

 whorls of 6-7, simple or once forked, usually mode- 

 rately stout branchlets. Secondary rays 2-3, 1-celled, 

 about ^— I the length of the primary, usually bluntish 

 with mucronate tips, sometimes acuminate. Fertile 

 tvhorls usually with shorter branchlets forming more 

 or less dense heads, but sometimes lax, the branchlets 

 once forked, with 1-celled secondary rays. Oogonia 

 solitary or geminate, c. 650-700 /a. long, c. 500-565 /a 

 broad; spiral cells showing about 7-9 convolutions, 

 swelling considerably at the apex ; coronula 25-40 ju. 

 high, deciduous. Oospore spheroidal, sometimes even 

 broader than long, c. 375-425 /x. long, 350-400 fx. 

 broad, 250 /* thick, dark chestnut-brown to almost 

 black, showing about 7 low, rather thick ridges 

 often broadening into flanges at the apex ; outer 

 membrane thick and semi-rigid, transparent or semi- 

 opaque, strong red-brown or yellow-brown, smooth 



