Plate XI. 



Fig. 41. STlilAKIA ATTENUATA. 



Colour. Pale olive. 



Substance. Delicately membranaceous. 



Character of Frond. Tliread-sliaped [filiform); tufted; branched. Stem 

 branched on each side. Branches long"^ simple; or sometimes re- 

 branched. Branches and branclilets mostly opposite; tapering at each 

 end; marked, when in fructification, with dark rings or bands. Root, 

 a disc. 



Measurement. From 3 to 12 inches long. 



Fructification. Minute seeds [spores) in clusters (accompanied by fibres), 

 forming rings or bands round the branches. 



Habitat. Our coasts generally. Growing on other algse between tide-marks, 

 and in from 4 to 5 fathom water. 



The mode of branching varies occasionally; but the marked character of 

 tapering extremities never fails. 



Fig. 42. PUNCTAEIA LATIFOLIA. 



Colour. Pale olive-green; sometimes darker in age. 



Substance. Thin; delicately membranaceous; semi-transparent; almost gela- 

 tinous when young; afterwards coarser. 



Character of Frond. A leafy expansion; flat; ribless; more or less oblong; 

 tapering suddenly at the base into a short stem; tip sometimes 

 obtuse, and sometimes pointed; margins wavy; growing in tufts. 



Measurement. From 8 to 16 inches long; from 1 to 3 wide. 



Fructification. Dot-like groups of seeds [spores) scattered over both surfaces 

 of the frond. 



Habitat. Sidmouth and Torquay. Belfast and west of Ireland. On rocks 

 and alg93 between tide-marks. Not very common. 

 21 



