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Phylum Phaeophyta – Order Notheiales

With the characters of the order, and containing a single genus, Notheia. Genus NOTHEIA Harvey & Bailey 1851: 371

Thallus hemi-parasitic on Hormosira or on Xiphophora, much branched, with most branches basally constricted and arising from within conceptacles of parent branches, probably as new plants following fertilisation, branches terete, slender. Growth from a group of 3 apical cells, segmenting to form a medulla of longitudinal filaments, and a cortex of shorter cells with a surface meristoderm. Structure largely haplostichous, with occasional intercalary longitudinal cell divisions; outer cells with several discoid phaeoplasts, without pyrenoids. Pit-connections present between lineages of cortical cells.

Reproduction: Conceptacles scattered over branches, containing female gametangia with 8 large motile gametes and antheridia with 64 small, motile sperms (anisogamous). Female gametes settling before fertilisation, or developing parthenogenetically to branched filaments.

Type and only species: N. anomala Harvey & Bailey 1851: 371.


HARVEY, W.H. & BAILEY, J.W. (1851). Descriptions of Seventeen New Species of Algae collected by the United States Exploring Expedition. Proc. Boston Soc. Nat. Hist. 3, 370–373.

The Marine Benthic Flora of Southern Australia Part II complete list of references.

Author: H.B.S. Womersley

Publication: Womersley, H.B.S. (14 December, 1987)
The Marine Benthic Flora of Southern Australia
Part II
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