THE LOWEST-TIDE POOL. 109 



Gbacillaeia Confeevoides — is of a deep red 

 colour, dries nearly black, and does not adhere well to 

 paper. 



Geacillaeia Compeessa. — Most frequently cast 

 ashore from deep water, attached to coral or larger 

 seaweeds. 



G-eacillaeia Eeecta. — On sand-covered rocks, 

 near low-water mark. Bears fruit in winter, and is 

 recognized by the densely-clustered tubercles on the 

 branches, and the lanceolate terminal pods containing 

 tetraspores. 



G-eacillaeia Mtjltipaetitjs. — This is much more 

 showy, but is very rare. The frond is from four to 

 twelve inches long ; flat, dull purple colour, or green. 

 Chiefly found in muddy places near low-water mark. 



CYSTOSEIEA EEICOIDES. 



(The name is from two Greek words signifying " a little sac" and 

 "a chain.") 



This is common in the tide-pools of the Channel 

 Islands and southern coast of Englaud, but seems to 

 be rare elsewhere. AYe recognize it easily by the long, 

 bushy, olive green frond, full of little pods, and having 

 an irridescence in the water which attracts the eye. 



Generic character. — Erond much branched, one to 

 two feet long. Branches full of small air vessels. 



Fructification. — It belongs to the Fucus tribe, and 

 has receptacles terminating the branches containing 

 spores and tufted antheridia. 



