Ectocarpece.'] ectocarpus. 163 



fine figure of it in Phyc. Brit., PI. cxxvi., in which may be 

 seen also the globose fruit, either in pairs opposite to each 

 other, or opposite to a branchlet. 



13. Ectocarpus erachiatus, Karvey. 



Hab. On RJwdomenia palmata. It has been found by 

 Sir W. J. Hooker and Mrs. Griffiths in England ; by Miss 

 Ball and Mr. Wm. Thompson in Ireland; and by Miss 

 M^Leish and D. L. on the coast of Ayrshire. It is rare, 

 however. The Ayrshire habitat is at Seamill, some miles 

 north of Ardrossan. 



By the fine figure of it in PL iv. of Phyc. Brit., it may 

 be seen that the fruit is imbedded in the stem where two 

 opposite branchlets meet. 



14. Ectocarpus Mertensii, AgardJi. 



Hab. On mud-covered rocks near low- water mark. xVn- 

 nual. April and May. Rare. 



This fine plant, though found by most of our distin- 

 guished naturalists in England and Ireland, is rare in Scot- 

 land, where as yet it has been found only by the Eev. Mr. 

 PoUexfen in Orkney, and by D. L. jun., at Joppa, on the 

 east coast, and at Saltcoats on the west coast. 



It was named by Mr. Turner in compliment to Professor 

 Mertens of Bremen, a distinguished Algologist. It has a 



