Ser. CHLOROSPERME®. Fam. Rivulariee. 
Prats LXVIIL. 
RIVULARIA NITIDA, 4y. 
Gen. Cuar. Frond globose or lobed, fleshy, firm, composed of continuous 
radiating filaments, annulated within, and springing from a spherical 
globule. Rivutari1a,—so named by Roth, in allusion to the fluviatile 
habitat of some of the first discovered species. 
Rrvotartia nitida; frond (large), gelatinoso-coriaceous, lobed and plaited, 
often bullated, lubricous, shining deep green, filaments simple, very 
much attenuated. 
Rivuvarta nitida, dy. Syst. p. 25. Harv. in Hook. Br. Fl. vol. ii. p. 393. 
Haro. in Mack. Fl. Hib. part 3. p. 235. Wyatt, Alg. Danm. no. 50. Hare. 
Man. p.152. Endl. 3rd Suppl. p. 12. 
Rivutartra bullata, Berk. Gl. Alg. t.ii. f.1. J. Ag. Alg. Medit.p.9. Endl. 
3rd Suppl. p. 13. 
ScyTocHLoria nitida, Harv. in Hook. Br. Fl. l.c. 
Atcyonrpium bullatum, Lamour. 
Puysactis lobata, Kitz. Phyc. Gen. p. 236. t. 4. f.5. 
Has. On marine rocks, at half-tide level. Annual. Summer and Autumn. 
Common on the southern shores of England, and south and west of 
Ireland. 
Geoer. Distr. Baltic Sea. Atlantic shores of Europe. Mediterranean Sea. 
Descr. Fronds, from + an inch to an inch or more in diameter, tremelloid, 
tufted or gregarious, much lobed and sinuated, at first compressed, and 
filled with solid gelatine ; afterwards hollow and inflated. Swhstance very 
firm and elastic, not easily torn, lubricous and subgelatinous to the touch. 
Colour a deep, but very vivid green. Filaments simple or pseudo-branched, 
wavy, laxly set in the interior of the frond, densely packed towards the 
surface, taperig to a very long, setaceous point, densely annulated within. 
Stri@ very conspicuous. 
eee 
This is the largest marine species of 2zvu/aria on the British 
shores, ornamenting, at the end of the summer, perfectly barren 
masses of rock with its bright-green glossy patches. On the 
western shores of Ireland it is very common as far north as 
Galway, and perhaps further; but has only, that I am aware of, 
been observed on the southern shores of England. Yet it in- 
habits the Baltic Sea. It probably, therefore, exists in many 
places on our shores, where it has been overlooked. 
The genus 2ivularia, as originally proposed by Roth, con- 
s 2 
