Electronic Flora of South Australia Genus Fact Sheet

Genus TIKVAHIELLA Kraft & Gabrielson 1983: 47

Phylum Rhodophyta – Class Florideophyceae – Order Gigartinales – Family Areschougiaceae

Thallus parasitic on Solieria robusta, forming small, white, lobed pustules with endophytic filaments penetrating the host and pit-connected to host cortical cells. Structure multiaxial, with a broad, laxly filamentous medulla and pseudoparenchymatous cortex.

Reproduction: Sexual thalli monoecious; non-procarpic. Carpogonial branches 3-celled, borne on inner cortical cells, directed inwards and with a reflexed trichogyne, and with the fertilized carpogonium producing two unbranched, non-septate, connecting filaments. Auxiliary cell an adjacent inner cortical cell in a darker staining (prior to diploidization) complex. Gonimoblast initials 1 or 2, developing thallus inwards, later forming a fusion cell with radial gonimoblast filaments bearing single, terminal carposporangia, with a slight filamentous enveloping tissue derived from scattered nutritive filaments. Cystocarps sunken in the lobes, ostiolate. Spermatangia cut off from outer cortical cells, either on separate lobes or at the bases of female lobes.

Tetrasporangia scattered, laterally attached to mid cortical cells, zonately divided.

Life history triphasic with isomorphic gametophytes and tetrasporophytes.

Type (and only) species: T. candida Kraft & Gabrielson 1983: 48.

Taxonomic notes: Tikvahiella differs from the only other parasitic genus (Gardneriella) in this family by its host, tetrasporangia (Gardneriella mainly bisporangia), carposporophytes with a central fusion cell (a sterile tissue in Gardneriella) and single carposporangia (chains in Gardneriella, which also has no ostiole).

References:

KRAFT, G.T. & GABRIELSON, P.W. (1983). Tikvahiella candida gen. et sp. nov. (Solieriaceae, Rhodophyta), a new adelphoparasite from southern Australia. Phycologia 22, 47–57.

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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