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Polysiphonia denudata
Species of alga From Wikipedia, the free encyclopedia
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Polysiphonia denudata (Polysiphonia variegate (C.Agardh) Zanardini) is a small red alga, Rhodophyta, growing as tufts up to 20 cm long without a main branch axis.[1]
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Description
Polysiphonia denudata is erect with repeatedly branched axes. Each branch consists of a central axis with 5 to 7 elongated pericentral cells all of the same length. Cortication occurs lower down, these corticating cells grow down in the grooves between the pericentral cells. The holdfast is discoid.[1]
Reproduction
The plants are dioecious. They bear spermatangia towards the tips of branches. Cystocarps are barrel-shaped when mature borne on a wide short stalk. Tetrasporangia occur in a spiral series in the branches near the tips.[1]
Habitat
The alga is very rare, grows on rock, stones or other large algae in the low-littoral or below in sheltered sites.[1][2]
Distribution
Reported from the north of Ireland in 1847, the specimen is in store in the Ulster Museum, Belfast[3] in England from the south coast,[4] Scottish records considered misidentifications,[5] Netherlands to Portugal and West Africa. The Mediterranean and west Atlantic.[1]
References
Further References
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