182 BRITISH SEA-WEEDS. 



on most parts of our coast, chiefly in bold rocky locali- 

 ties where it grows, generally in deep water, on rocks and 

 Lammaria. It is said to be biennial, and is in perfec- 

 tion during spring and summer. It was formerly called 

 Rhodymenia laciniata. 



Genus LXXXII. KALLYMENIA. 



Frond fleshy, membranaceous, flat, expanded, with an 

 irregular outline, composed of three strata ; the centre con- 

 sisting of longitudinal, branching, interlaced, articulated fila- 

 ments ; the second of large, many-sided cells, and the third, 

 or cortical, stratum of minute cells. Spores minute, arranged 

 in masses which are enclosed, several together in an indis- 

 tinct pericarp, in coneeptacles immersed in and projecting 

 on both sides of the frond ; tetraspores cruciate, scattered 

 among the surface cellules. — Kailymenia, from the Greek 

 Icalos, beautiful, and umeen, membrane. 



There are two British species of this genus, both of 

 which are rare. 



Kallymenia reniformis. The kidney-shaped 

 Kallymenia. 



Stem short ; frond when young kidney-shaped or roundish, 

 becoming irregularly cleft and lobed with age, sometimes 

 producing young fronds on its margin. Spores in coneep- 

 tacles, which are densely scattered over, and half immersed 

 in the frond ; tetraspores minute. 



The recorded habitats of this species extend from 

 Orkney to the Channel Islands ; it is nowhere abundant, 

 but more so in the south than in the north. It grows 

 in deep, shady pools at extreme low-water mark, is per- 

 ennial, and in perfection in summer and autumn. 



