56 BRITISH SEA-WEEDS. 



the whole surface of the frond : — 1, tufts of stalked cells, 

 containing spores ; 2, minute branches of fibres, bearing 

 linear, dotted, sessile antheridia. — Cutleeia, named after 

 Miss Cutler, a lady whom every student in marine botany 

 should delight to honour. 



The number of known species is only four or five. They 

 are distributed over the southern shores of Europe. 



Cutleria multinda. Many-cut Cutleria. 



Frond varying in length from two or three inches to a 

 foot or more, wedge-shaped, divided into irregular, forked 

 branches, which spring from very acute axils, and have 

 tufts of delicate, jointed fibres on their pointed tips. Fructi- 

 fication in dots, attached to a network of branching, jointed 

 fibres spreading over the whole frond. 



This very beautiful and interesting plant has been 

 found in many British localities, but does not appear to 

 be abundant in any of them. It is annual, and grows 

 on rocks which are not left bare, even by the lowest 

 tides. The collector must, therefore, either dredge for 

 it or be content with such specimens as may be cast on 

 shore, and these are not numerous, except after storms. 

 Externally Cutleria multifida differs from Dictyota 

 dichotoma in having a more wedge-shaped and less 

 divided frond, which, when fertile, is covered all over 

 with dots of fructification. 



Genus XV. HALISERIS. 



Frond membranous, flat, forked, mid-ribbed. Fructifi- 

 cation, clusters of egg-shaped spores, generally arranged in 

 rows running lengthwise of the frond. — Haliseeis, from 

 ah, the sea, and seris, endive. 



There are several species, all growing in warm cli- 



