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Sebdenia dichotoma Berthold, 1884
Red algae (Rhodophyta) are often red in color due to the phycobilins involved in photosynthesis. However, not all Rhodophyta are recognizable as such at first glance. Sebdenia dichotoma appears to belong to these red algae. This red alga of the Mediterranean and North Atlantic grows on stony soils and can be found as far north as the Azores.
Sebdenia dichotoma's thalli are compressed at the base and then cylindrical, up to 30 cm high and 3-10 mm wide. The thalli are pointed at the end and can have a pinkish coloration. The color is occasionally yellowish. The consistency is fleshy and gelatinous. The red alga develops from a disc-shaped base with a multiaxial structure.
Sebdenia dichotoma is a less common species. It grows on gravel, rocks and areas covered with coralline algae, preferring areas with strong currents.
The thalli begin to develop from the base in winter and reach their maximum size in summer. Basal structures persist from one year to the next.
Reproduction: three-phase life cycle with gametophytes and isomorphic sporophytes.
There is a very high risk of confusion with Halymenia elongata. Both species are so similar that it is often impossible to distinguish them reliably in a photo (like many algae). Absolute certainty is only possible under the microscope. Here the species differ significantly.
We have therefore sought the advice of an expert. The photo shown most likely shows the red alga Sebdenia dichotoma.
Synonymised names:
Chrysymenia dichotoma J.Agardh, 1851
Halymenia dichotoma (J.Agardh) J.Agardh, 1876 (synonym)
Hymenophlaea dichotoma (J.Agardh) J.Agardh, 1899 (synonym)
Sebdenia feldmannii Codomier, 1972
Direct children (1):
Variety Sebdenia dichotoma var. maior (Ercegovic) Antolic & Span, 2013
Red algae (Rhodophyta) are often red in color due to the phycobilins involved in photosynthesis. However, not all Rhodophyta are recognizable as such at first glance. Sebdenia dichotoma appears to belong to these red algae. This red alga of the Mediterranean and North Atlantic grows on stony soils and can be found as far north as the Azores.
Sebdenia dichotoma's thalli are compressed at the base and then cylindrical, up to 30 cm high and 3-10 mm wide. The thalli are pointed at the end and can have a pinkish coloration. The color is occasionally yellowish. The consistency is fleshy and gelatinous. The red alga develops from a disc-shaped base with a multiaxial structure.
Sebdenia dichotoma is a less common species. It grows on gravel, rocks and areas covered with coralline algae, preferring areas with strong currents.
The thalli begin to develop from the base in winter and reach their maximum size in summer. Basal structures persist from one year to the next.
Reproduction: three-phase life cycle with gametophytes and isomorphic sporophytes.
There is a very high risk of confusion with Halymenia elongata. Both species are so similar that it is often impossible to distinguish them reliably in a photo (like many algae). Absolute certainty is only possible under the microscope. Here the species differ significantly.
We have therefore sought the advice of an expert. The photo shown most likely shows the red alga Sebdenia dichotoma.
Synonymised names:
Chrysymenia dichotoma J.Agardh, 1851
Halymenia dichotoma (J.Agardh) J.Agardh, 1876 (synonym)
Hymenophlaea dichotoma (J.Agardh) J.Agardh, 1899 (synonym)
Sebdenia feldmannii Codomier, 1972
Direct children (1):
Variety Sebdenia dichotoma var. maior (Ercegovic) Antolic & Span, 2013
