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Mastocarpus stellatus
Haploid stage (1st picture) and diploid stage looks like tar (2nd picture) "A small red alga (up to 17 cm in length), the fronds are channelled with a thickened edge and widen from a narrow stipe with disc-like holdfast. The channelling is often slight and is most noticeable at the base of the frond. Mature plants have conspicuous growths of short, shout papillae (reproductive bodies) on the fronds. The plant is dark reddish-brown to purple in colour and may be bleached."
Tidal rocky shore Cabo Raso, Cascais "This alga is found on rocky shores, particularly in very exposed areas where it grows amongst barnacles and mussels, on less exposed shores it is often abundant under fucoids. It mainly inhabits the lower shore and rockpools, but can be found in the shallow sublittoral and occasionally deeper waters."
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