Electronic Flora of South Australia Family Fact Sheet

FAMILY HORMOSIRACEAE Fritsch

Phylum Phaeophyta – Order Fucales

Thallus of branched chains of moniliform vesicular segments, subspherical to elongate, joined by slender constrictions; holdfast discoid. Growth from a group of four apical cells, each three-sided in transverse section, with intermittent activity. Structure with a loosely filamentous medulla surrounding the air space, a cortex of isodiametric cells and a surface meristoderm.

Reproduction: Thalli dioecious. Conceptacles scattered over vesicular segments; oogonia sessile on conceptacle wall, producing four eggs; antheridia on branched paraphyses, producing 64 sperms.

Taxonomic notes: A monogeneric family, distinguished by intermittent growth from a group of 4 apical cells giving hollow segments joined by narrow constrictions, dioecious thalli, and oogonia with four eggs.

References: The Marine Benthic Flora of Southern Australia Part II

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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