THE MARINE BOTANIST. 115 



brown on exposure to the air or in drying. Grows 

 on rocks, &c. Annual. Summer. Abundant on 

 the eastern and southern shores of England and 

 Ireland. Rare in Scotland and the west of Ireland. 

 Frith of Forth. Ayrshire. Bantry, Malbay. 



0. S. P. stricta. ^^ An ill-defined, confused 

 species." Grows on sand-covered rocks. 



P. pulmnatay " resembles P. urceolata in minia- 

 ture, but has the soft substance of the P. fibrata, 

 and is a much more slender plant." Grows on 

 rocks and algae between tide-marks. Annual. 

 Summer. Not uncommon. 



P. spinulosa. An extremely rare species, of 

 which only one specimen was found by the late 

 Captain Carmichael, at Appin, Argyle. 



P. Hichardsoni. Colvend, Dumfries ; only a 

 single example of this plant is preserved in the 

 Hookerian Herbarium, from which the plate in the 

 Phycologia Britannica, t. x. was taken. 



P. Griffithsiana, Parasitical on Poly ides ro- 

 tundus at Torquay. Isle of Portland, Annual. 

 Summer. Very rare. ^' Chiefly remarkable for 



