Sebdenia flabellata (J.Agardh) P.G.Parkinson
Halymenia, being a critical account of the confused nomenclature of Halymenia C. A. Agardh 1817 (Hal 12 (1980)
Conservation Code:
Not threatened
Naturalised Status: Native to Western Australia
Name Status:
Current
Scientific Description
John Huisman & Cheryl Parker,
Monday 20 June 2011
Habit and structure. Thallus erect, pale pink, flabellate, to 8–14 cm tall, arising from a discoid holdfast, dichotomously branched with rounded axils; axes terete to slightly flattened, mostly soft but turgid, near base 2–4 mm in diameter and in some specimens cartilaginous, broadening to 8–12 mm wide, broadest just below dichotomies. Structure multiaxial, with a filamentous medulla of elongate cylindrical cells 15–20 µm in diameter, L/B c. 10, grading to an outer medulla of stellate cells 3–4 layers of large hyaline cells, then a small-celled cortex, the surface cells subspherical, 10–20 µm in diameter. Spherical to obovoid gland cells 25–35 µm in diameter borne laterally on medullary filaments.
Reproduction. Reproductive structures not observed.
Distribution. Widely
distributed in tropical and warmer seas. In W. Aust., known from
Habitat. Epilithic, often on rocks in sandy regions of the subtidal.
