Delesserie<^.'] nitophyllum. 263 



It now includes NUqp//?/llufti ocellutiim. Dr. Greville^s 

 PL XII. in Alg. Brit._, with fructification^ is very instructive. 

 Professor Harvey devotes Plates cii. and ciii.^ Phyc. Brit., 

 to the illustration of the fruit, textures, and varieties of this 

 interesting and beautiful Alga. 



2. NiTOPHYLLUM LACEEATUM, GfeVllle. 



Hab. In the sea, on rocks and Algse ; to which it can 

 attach itself by its ^dges, and by Kttle roots from the under 

 side of the frond, so that it can scarcely be torn off without 

 being injured. 



It is a very valuable plant ; the colour is much darker 

 than that of the preceding, from which it is also distinguished 

 by flexuous veins, proceeding from the base of the frond. 

 It is annual, and fruits in summer. Towards the end of 

 the season the fronds have become dark-coloured, and so 

 destitute of gelatine that they do not adhere to paper. In 

 this state it is very generally spotted with pretty Lepralm. 

 In Ireland it grows to a great size, ten inches or so in 

 length. It is rather a common plaut in most places ; but 

 in Ayrshire it occurs less frequently. It may, however, 

 generally be got in winter, in a young state, on the roots of 

 Halklrijs and Lam. digitata. 



3. iS^iTOPHYLLUM HiLLi^, GrevilU. 



