Marine Algce of Berwick-on-Tweed. 241 



Tribe U.—RIVULARIEAE. 

 EIYULAEIA, Roth. 



ElVULARTA ATRA, Both. 



Catal. Bot. in., p. 340. 

 Descr. Rivularia atra, Harv., Phyc. Brit. ; Farlow, Mar. Alg. p. 38. 

 Fig*. „ „ Harv., I.e. pi. 239 ; Farlow, I.e. pi. II., fig. 2. 



Syn. Euactis amoena, atra, eonfluens, hemisphaerica, Lenormandiana 

 et marina, Ktz. 

 Linckia atra, Lyngb., Hydr. Dan., p.195 t. (55 ; Johnston, Fl.Berwk. 

 ' n., p. 261. 

 Zonntrichia hemisphaerica, J. Act., Alg, Med. 

 Hab. On the rocky bottoms of shallow puddles near high-water mark. 

 Also Epiphytic on Cornllina officinalis, Chtdophora rupestris, and 

 other small Alga?. All the year. Common along the whole 

 Berwickshire coast. 



A small species easily recognised by its dark colour and 

 globose or hemispherical shape. The fronds vary in size from 

 that of a pin's head to that of a small pea. 



f. confluens (Ktz.) Farlow , 



Descr. Rivularia ati \, var. confiuens, Farlow, I.e., p. 38. 

 Fig. Euactis confl tens, Ktz., Tab. Phyc. i. t. 77. 

 Exsicc. Rivularia contiuens, Cm., Alg, Mar. Pinist., no. 3:'5. 

 Hab. On mud-covered rocks near high water mark. Rare. Greenses. 

 Sharper Head. 



Eivi t laria nitida, Aff. (non Aliorum.) 

 Ag. Disp. Alg. Suecae., p. 44 (1817.) 

 Descr. Rivularia plicata, Harv., Phyc. Brit. ; Farlow, Mar. Alg., p. 38. 

 Fig. „ ,, Harv., I.e. pi. 315. 



Syn. Rivularia nitida, Bornet et Flahault, Revis. des Npstoc. Hetero-. 

 cyst. Ann. Sc. Nat., ser. 7, vol. iv., Bot. p. 357; Ag., Synopsis. 

 Alg. Scand., p. 130; Ag., Syst. Alg., p. 25; Flora Danica, t. 

 2518, fig. 1. 

 Rivularia plicata, Carm. in Hoolc., Brit. Flor. vol. n., p. 392 

 (1833) ; Eng. Bot. t. 2911; Rabenhorst, Fl. Europ. Alg. n., p. 208, 

 llab. On mud-covered rocks near high-water mark. Burnmouth, 

 Eyemouth. Also on the muddy sides of shallow pools along 

 the banks of the Tweed. Autumn. Rare. 

 If 



