Cystoseira compressa f. rosetta (Ercegovic) Cormaci, G. Furnari, Giaccone, B. Scammacca & Serio

Marletta, Giuliana & Lombardo, Andrea, 2023, The Fucales (Ochrophyta, Phaeophyceae) of the Island of Pantelleria (Sicily Channel, Mediterranean Sea): a new contribution, Italian Botanist 15, pp. 137-163 : 137

Cystoseira compressa f. rosetta (Ercegovic) Cormaci, G. Furnari, Giaccone, B. Scammacca & Serio

Fig. 4A, B

Cystoseira compressa subsp. rosetta Ercegovic. Basionym.

Cystoseira compressa subsp. rosetta Ercegovic. Synonym.

Morphology of specimens from Pantelleria.

This form is cespitose, with flattened habit, forming a rosette. It is attached to the substate by a small discoid holdfast. The apices are smooth. Primary branches are short (1-4 cm), strongly flattened and foliaceous. They are usually crossed by brownish transversal stripes. The branches are arranged with a distichous and alternating disposal. The cryptostomata are not very prominent and are disposed on longitudinal series. During the monitoring activity, we did not find fertile thalli of this form.

Habitat.

C. compressa f. rosetta occurred on wave-exposed coasts at Kattibuale, Gadir, Cala Tramontana, Martingana, Grotte Sataria, Kuddie Rosse and Arenella, in the upper infralittoral (0-1 m).

Distribution.

It is distributed in the whole Mediterranean Sea and along the North-West Atlantic, Bermudas Islands and East Atlantic, from Azores to Cape Verde ( Blanfuné et al. 2022).

Remarks.

During the monitoring, thalli of this form were found isolated in shaded habitats, such as in small crevices between rocks.

Figures

Figure 4. Cystoseira compressa f. rosetta A habit (the arrow indicates the thallus) B detail of primary branches with brownish transverse bands and cryptostomata disposed in longitudinal series.