Electronic Flora of South Australia Genus Fact Sheet
Phylum Phaeophyta – Order Fucales – Family Seirococcaceae
Thallus usually 1–2 m long, with a single stipe bearing distichously long, basally branched, ligulate axes or primary branches, bearing marginally and densely, simple, flat laterals 5–15 (–25)cm long and 3–12 (–20) mm broad, together with ovoid to broadly fusiform vesicles 2–4 (–5) cm long; holdfast with a discoid-conical centre and a marginal rim, with radiating, laterally appressed, haptera. Growth from a short series of four-sided apical cells. Structure with a medulla of elongate cells and hyphae, and a cortex of isodiametric cells with a surface meristoderm.
Reproduction: Thalli dioecious. Mature laterals becoming receptacles, with unisexual conceptacles scattered over their basal surfaces; oogonia sessile, with a mesochiton collar and a single egg; antheridia on branched paraphyses.
Type (and only) species: P. comosa (Labillardière) C. Agardh.
Taxonomic notes: Phyllospora is distinguished from Seirococcus and Scytothalia by its habit, with long primary branches bearing dense marginal rows of simple laterals which become receptacles, and by the presence of vesicles.
AGARDH, C.A. (1839). Revision der Algengattung Macrocystis. Nova Acta Acad. Caesar. Leop. Carol. 19, 281–317, Plates 26–28.
The Marine Benthic Flora of Southern Australia Part II complete list of references.
Womersley, H.B.S. (14 December, 1987)
The Marine Benthic Flora of Southern Australia
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