Ch'Mclriea.'] chrysimeisia. 271 



the ramuli towards the base ; colour pale pink, becoming 

 yellow when in shallow water. 



5. Laurencia tenuissima, GreviUe. 



Ilab. In the sea, on rocks. Yery rare. South of England 

 and Ireland. Annual. Summer. Miss White, Isle of 

 Portland and Jersey; fine and plentiful. 



It differs from L. clasijphylla by the ramuli tapering both 

 towards the base and apex. Tor good figures and descrip- 

 tions, see Phyc. Brit., PI. cxlviii. 



Genus LXXYI. CHRYSIMENIA, /. Agardh, 



Gen. Char. Prond tubular, continuous (not constricted or 

 jointed), filled with a watery juice, and traversed by longitudinal 

 filaments ; its scales composed of several rows of cells, the in- 

 nermost of which are distended, and much elongated, the outer 

 gradually smaller, and the ultimate very minute. Fructification 

 of two kinds : ] , ovate or conical capsules (ceramidia), containing 

 a dense mass of angular spores fixed to a central placenta ; 2, 

 triparted tetraspores immersed in the ramuli. — The name is from 

 two Greek words signifying golden membrane, because the species 

 acquires golden tints if long steeped in fresh water. — Harvey. 



1. Chrysimenia clavellosa, /. Agardh. (Plate XIY. 

 fig. 56, a bra]ich, natural size; and to the right at the base 

 a small branch with capsules, magnified.) 



