Spongonema tomentosum (Hudson) Kützing
Description: Thallus filamentous, string-like, up to 200mm long. Erect system of branched assimilatory filaments; branching secund, intertwining right-angled branches present. Filaments densely interwoven. Basal system of free filaments and rhizoids; some filaments aggregated into pseudodiscs. One or two linear chloroplasts per cell. Unilocular sporangia present; plurilocular sporangia multiseriate, elongate, terminal on short branchlets.
Habitat: Mid- to lower intertidal epiphytic on Fucus vesiculosus and Himanthalia elongata.
Species list
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