A Numerical Taxonomic Study ofFucus Distichus(Phaeophyta)

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Abstract
The genusFucusL. is widely distributed through the cool temperate waters of the north Atlantic and north Pacific oceans. The very large number of sub-generic taxa (> 100) previously recognized was reduced by Powell (1963) to only 6 species. In his revision, Powell recognizedF. distichusL. emend. Powell as the most variable of these. He classified the intra-specific variation in this species into 4 sub-species:F. distichus distichus, F. distichus anceps(Harv. et Ward ex. Carruthers) Powell,F. distichus evanescens(C.Ag) Powell andF. distichus edentatus(Pyl.) Powell. Because of reports that intermediate forms existed in Iceland (Jonsson, 1903) and the Faeröes (Börgesen, 1902), Powell (1957a,b) decided to use sub-specific status rather than specific designation for these 4 taxa. However, within North America the 4 sub-species ofF. distichuswere often assigned specific rank (e.g. Taylor, 1957).

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