Alsidium triquetrum (S.G.Gmelin) Trevisan

Resendiz, María Luisa Núñez, Dreckmann, Kurt M., Sentíes, Abel, Wynne, Michael J. & Tejera, Hilda León, 2019, Marine red algae (Rhodophyta) of economic use in the algal drifts from the Yucatan Peninsula, Mexico, Phytotaxa 387 (3), pp. 219-240 : 230

Alsidium triquetrum (S.G.Gmelin) Trevisan

Thallus fleshy, reddish, 12–24 cm long, with triangular axes in cross section, 380–420 μm in diameter. Main axes branching pseudo-dichotomously; main axes and branches covered by three rows of ramuli, arranged in an opposite manner, simulating scales of 1–2 mm in length ( Fig. 11 ). Polysiphonous organization, with 7 pericentral cells, 55–90 x 80–105 μm in diameter, peltate or elongated, arising from a central spherical axial cell (45–50 μm in diameter) ( Fig. 12 ). Medulla with two layers of rounded cells, 55–90 μm in diameter. Cortex with one layer of conspicuously pigmented cells, 15–20 μm in diameter ( Fig. 12 ).

Figures

FIGURES 6–16. 6. Jania pumila, main axes showing genicula, intergenicula and branching pattern.Scale bar = 5 mm.7–8. Acanthophora spicifera. 7. Habit. Scale bar = 2 cm. 8. Medullary and cortical cells. Scale bar = 70 μm. 9–10. Alsidium seaforthii. 9. Habit. Scale bar = 2 cm. 10. Pericentral, medullary and cortical cells. Scale bar = 100 μm. 11–12. Alsidium triquetrum. 11. Habit. Scale bar = 3 cm. 12. Pericentral and medullary cells. Scale bar = 145 μm. 13–14. Digenea simplex. 13. Habit. Scale bar = 3.5 cm. 14. Pericentral and medullary cells. Scale bar = 110 μm. 15–16. Laurencia intricata. 15. Habit. Scale bar = 2 cm. 16. Superficial cherry bodies. Scale bar = 50 μm.