82 HANDY BOOK OF 



of the C. glaucescens, a species, as yet, considered peculiar 

 to the British Isles, and of which, in Devonshire, Torquay, 

 and Falmouth — in Ireland, Portmarnock, and the rocks 

 beyond Kingstown Harbour — are mentioned as places of 

 growth. Algologists, though little skilled in the peculiari- 

 ties of the Cladophora tribe, may readily distinguish this 

 elegantly tufted species by its glaucous hue when fresh, by 

 the slenderness of its filaments, and the uniform length of 

 the articulations throughout the stem. The uncialis, com- 

 mon to the shores of Northern Europe, has also its peculiar 

 characteristics, and, though resembling the lanosa more 

 nearly than any other of our native species, yet forms more 

 dense and rope-like tufts, which become inextricably woven. 

 Its habitat affords another clue ; for it frequents rocky places, 

 clinging to the surface of the rock, or nestling in the thin 

 coating of sand which verges to the edge of low- water mark; 

 while the lanosa, on the contrary, is almost uniformly para- 

 sitic on other Algae, or else attached to pieces of wood, or 

 the leaves of the Zostera. 



SeBIES III. — CHLOBOSPEBMEiE. 

 GRASS-GREEN SERIES. 



Plants growing in the sea, in fresh water, or in damp 

 situations ; either filamentous, membranaceous, or shapeless ; 

 either colourless, or, owing to the presence of an internal 

 granular sporular mass, of a grass -green, very rarely purple 

 or red colour. Fructification, green or purple sporules, 

 either filling the frond, or collected into sporidia, rarely con- 

 tained in external capsules. — Harvey. 



Family XVIIL— Siphoneje. 



LXXXV. Codium. Name from a Greek word signifying 

 the skin of an animal. 



