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Electronic Flora of South Australia Genus Fact Sheet
Phylum Phaeophyta – Order Dictyosiphonales – Family Striariaceae
Thallus (sporophyte) much branched irregularly to oppositely, with a terminal trichothallic filament and remaining uniseriate for several cells below the meristem. Structure of branches polystichous, with longitudinal and further transverse cell divisions giving a tiered arrangement in young parts, becoming hollow with a small-celled cortex, one cell thick, and a medulla of 1–2 large cells; cells with numerous discoid phaeoplasts, with or without pyrenoids. Phaeophycean hairs scattered or in whorls, numerous.
Microthallus pulvinate, of radiating, branched filaments, giving rise to the macrothallus directly or recycling itself.
Reproduction: Reproduction of sporophyte by ovoid unilocular sporangia (often apomeiotic) in sori, with unicellular paraphyses, arranged more or less in whorls around the branches, produced by subdivision of cortical cells. Microthallus with plurilocular and occasionally unilocular sporangia, with the zooids reproducing the macrothallus or the microthallus (Nygren 1975), or acting as isogametes.
Life history diplohaplontic and heteromorphic, or direct via microthallus.
Type and only species: S. attenuata Greville.
References:
GREVILLE, R.K. (1828). Scottish Cryptogamic flora. Vol. 6, Plates 331–360, synopsis 1–82. (Edinburgh.)
NYGREN, S. (1975). Life history of some Phaeophyceae from Sweden. Bot. Mar. 18, 131–141.
The Marine Benthic Flora of Southern Australia Part II complete list of references.
Publication:
Womersley, H.B.S. (14 December, 1987)
The Marine Benthic Flora of Southern Australia
Part II
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