Electronic Flora of South Australia Family Fact Sheet
Phylum Phaeophyta – Order Chordariales
Thallus (sporophyte) erect, 4–20 cm long, coarse and very mucoid, usually much branched with terete branches 4–8 mm thick and tapering basally, multiaxial and haplostichous, with a medulla of separated filaments with anastomoses and mucilage-filled spaces, and a pseudo-parenchymatous cortex with a small-celled epidermis, epilithic or on barnacles. Growth by apical cells of filaments surrounding a clavate, rarely dividing "apical cell" at branch ends, with periclinal divisions of apical and subapical cells of filaments and oblique divisions of apical and epidermal cells. Ends of branches with 6–12-celled hairs from the epidermal cells, and phaeophycean hairs present in conceptacles. Cortical cells with a single stellate phaeoplast.
Reproduction: Reproduction by unilocular sporangia borne in conceptacles scattered over the branches, producing meiospores. Gametophytes forming multiseriate, plurilocular gametangia at the base of branches; zygotes developing into plethysmothalli or sporophytic macrothalli (Price & Ducker 1966).
The Splachnidiaceae is a monospecific family, containing only Splachnidium rugosum.
Life history heteromorphic with a filamentous microthallus, probably gametophytic.
MITCHELL, M.O. & WHITTING, F.G. (1892). On Splachnidium rugosum Grev., the type of a new order of algae. Phycol. Mem., Pt. 1, 1–10, Plates 1–3.
PRICE, I.R. & DUCKER, S.C. (1966). The life history of the brown alga Splachnidium rugosum. Phycologia 5, 261–273.
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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State Herbarium of South Australia