Pelvetia
Pelvetia (family Fucaceae) A genus of brown seaweeds, in which the thallus differs from that of Fucus species in having no midrib, and from that of Ascophyllum in having no air bladders. The only British species is P. canaliculata (see CHANNELLED WRACK).
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Indifferent Species , indifferent species A species with no real affinity for any particular community, but which is not rare (as an accidental species would be). It is fi… preferential species , preferential species In phytosociology, a species that is present with varying abundance in several communities, but is especially abundant and vigor… Constant Species , constant species(constancy) In phytosociology, a species common to a particular association or community, but not necessarily confined to that commun… Fugitive Species , fugitive species (opportunist species) A species typical of unstable or periodically extreme environments, e.g. deserts or ephemeral ponds, and chara… ring species , ring species A group of subspecies that are contiguous along a cline. Members of each population are able to mate successfully with members of adjace… accidental species , accidental species One of five classes of fidelity used by the Braun-Blanquet school of phytosociology in the description and classification of plant…
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Pelvetia