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Polyides rotunda
Species of alga From Wikipedia, the free encyclopedia
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Polyides rotunda is a species of small red marine alga in the family Polyidaceae.
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Description
Polyides rotunda grows to 20 cm (7.9 in) in length, its cartilaginous, terete and branches two or three times dichotomously. The branches are about 2 mm (0.079 in) in diameter reaching a uniform height. The holdfast is disc like. In colour it is purplish red.[1][2]
They are exclusively multicellular, like all Polyidaceae.
Habitat
Generally epilithic in rock pools in the littoral and upper sublittoral.[1] Sand tolerant.[3]
Distribution
Generally distributed around Ireland, Great Britain, the Isle of Man and the Channel Islands.[4]
Reproduction
Polyides rotunda is dioecious. The spermatangial cells develop in swollen areas near the apices. Cystocarps develop near the apices.[1] The tetrasporangia are cruciate, that is cross-shaped.[5]
Similar species
Furcellaria lumbricalis (Hudson) Lamouroux is very similar but can be distinguished by the holdfast which has claw-like branches while that of Polyides being disc-like.[6]
References
Wikiwand - on
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