(13) 



during the summer months, the young stems of Laminaria digitata 

 (Tang or Tangle) are generally mixed up with it, and also a sprinkling 

 of pepper dulse {^Laurencia pimiatijida). 



In estuaries where the water is brackish, it often grows to a large 

 size, and is then of a paler colour, the fi-onds are often quite entire, or 

 but slightly divided at the summit, and the structure is somewhat more 

 lax. Such specimens are generally of an oval or oblong form, and are 

 often fi'om twelve to eighteen inches in length. 



EXPLANATION OF PLATE LXX. 



Fig. 1. — Rhodymenia palmata, natural size. 

 2. — Portion of a frond with part of a sorus. 

 3 . — Tetraspores. 

 4. — Portion of surface witli tubercles. All magnified. 



