Cladophora rupestris (seaweed)

Cladophora rupestris (seaweed)

Observation - Cladophora rupestris (seaweed) - UK and Ireland. Description: Rarely, unlike birds and perhaps flowers, is one picture sufficient to ID a seaweed. This is special

Rarely, unlike birds and perhaps flowers, is one picture sufficient to ID a seaweed. This is specially the case with Cladophora, even though C.rupestris is the most common form.
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One needs a good close-up to see the 'cellular' structure in the stems. Small, even, apparently articulated segments, make up the crowd of profuse, irregularly branched, filamentous structures. Slightly stiff out of the water and usually coming away from its rocky substrate in moss-like clumps. When drying it seems to lose the cell definition in the filaments but recovers at each tide (but see Picture 7).
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Underwater it is an incredibly strong green. This frequents rock pools and is found at the mid-tide level, most usually in the shelter of fissures.
Picture 5 shows Cock's Comb and Pepper Dulse. Picture 6 shows it in a typical location, just above the level of a rock pool. Usually thick and matted.
Picture 7 shows the desiccation process - not entirely dry buy showing how the filament sections break down. 1 minute rehydration in seawater, restores the whole structure. This may turn out to be a useful ID feature.
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EDIT retagged