Asperococcus fistulosus (Hudson) W.J.Hooker
Description: Thallus light to medium brown,
simple, membranous, hollow, terete, usually 10–30 cm long
and 3–10 mm in diameter, tapering slightly to the apex and
gradually to the small, discoid, rhizoidal, holdfast
100–300 µm across; epiphytic on
Fucus serratus and other larger algae, mostly in late
spring and summer.
Habitat: Epiphytic on older plants of
Fucus and other brown algae, mid-intertidal pools, and
lower intertidal.
Key characteristics: Brown and tubular.
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