Electronic Flora of South Australia Genus Fact Sheet

Genus GLOIOPHYLLIS J. Agardh 1890a: 27

Phylum Rhodophyta – Class Florideophyceae – Order Gigartinales – Family Cystocloniaceae

Thallus mucilaginous, irregularly furcately and complanately branched, often marginally proliferous, branches flat, relatively thick below; holdfast discoid. Structure uniaxial, axial filament soon inconspicuous, medulla of rhizoidal filaments and cortex pseudoparenchymatous with large inner and small outer cells, rosettes weakly developed.

Reproduction: Sexual thalli probably dioecious; procarpic. Carpogonial branches 3-celled, borne laterally on subsurface cortical cells, with the adjacent auxiliary cell and cortical cells becoming darkly staining along with a small-celled, inward, nutritive tissue; carposporophyte with small central cells (no fusion cell) and radiating gonimoblast filaments with terminal clusters of carposporangia together with sterile filaments passing to pericarp cells. Cystocarps scattered over thallus surface, protuberant, with a cellular pericarp, non ostiolate. Spermatangia unknown.

Tetrasporangia scattered in the cortex, zonately divided.

Life history triphasic with isomorphic gametophytes and tetrasporophytes.

Type (and only) species: G. barkeriae (Harvey) J. Agardh 1890a: 29.

Taxonomic notes: Gloiophyllis is closely related to Rhodophyllis and Craspedocarpus, differing from the former in lacking a fusion cell, its thicker rhizoidal medulla, and the thicker, gelatinous thallus. Craspedocarpus also lacks a fusion cell but has much better developed rosettes, and only slight medulla. Gloiophyllis also bears carposporangia mostly in small clusters, whereas they are essentially in chains in the other genera.

References:

AGARDH, J.G. (1890a). Till algemes systematik. Acta Univ. lund. 26(3), 1–125, Plates 1–3.

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

Author: H.B.S. Womersley

Publication: Womersley, H.B.S. (14 January, 1994)
The Marine Benthic Flora of Southern Australia
Rhodophyta. Part IIIA, Bangiophyceae and Florideophyceae (to Gigartinales)
Reproduced with permission from The Marine Benthic Flora of Southern Australia Part IIIA 1994, by H.B.S. Womersley. Australian Biological Resources Study, Canberra. Copyright Commonwealth of Australia.


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