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Electronic Flora of South Australia Family Fact Sheet
Phylum Rhodophyta – Order Ceramiales – Family Ceramiaceae
Thallus erect, axes and laterals branched strictly alternately and distichously with a consistent pattern, apical cells of axes more or less transversely divided, cutting off subapically 5 or 6 whorl-branchlets (including lateral branches) in a modified alternating sequence, each branched 3–6 times trichotomously to laterally, whorls closely adjacent, axes corticated below with rhizoids; gland cells present or absent. Cells uninucleate.
Reproduction: Gametophytes dioecious. Procarps borne on basal cells of whorl-branchlets, supporting cell cut off separately or a vegetative cell; gonimoblast with elongate, often branched, stalk cells bearing the lobes of carposporangia, and the lower part of the auxiliary cell becoming pit-connected to the fertile axial cell. Spermatangia, where known, cut off from short lateral branches of the whorl-branchlets.
Tetrasporangia borne on the whorl-branchlets, sessile or terminal on short lateral branches, tetrahedrally divided.
Life history triphasic with isomorphic gametophytes and tetrasporophytes.
Taxonomic notes: A tribe of 2 genera, Dasyphila Sonder and Muellerena Schmitz (see Wollaston 1977a). Wollaston (1977a, p. 450) recognises the tribe Dasyphileae on the basis of its consistent branching pattern, whorls of 5 or 6 whorl-branchlets, and the elongate stalk cells to the carposporangial groups, together with the presence of a secondary pit-connection between the lower part of the auxiliary cell and the fertile axial cell. The 2 genera are regarded as advanced forms developed from the Crouanioideae.
References:
SCHMITZ, F. (1889). Systematische Ubersicht der bisher bekannten Gattungen der Florideen. Flora, Jena 72, 435–456, Plate 21.
WOLLASTON, E.M.(1977a). Morphology and life history of Dasyphila preissii Sonder, with notes on the taxonomic position of Muellerena wattsii (Harvey) Schmitz (Rhodophyta, Ceramiaceae). Phycologia 16, 443–450.
The Marine Benthic Flora of Southern Australia Part IIIC complete list of references.
Publication:
Womersley, H.B.S. (24 December, 1998)
The Marine Benthic Flora of Southern Australia
Rhodophyta. Part IIIC. Ceramiales – Ceramiaceae, Dasyaceae
©State Herbarium of South Australia, Government of South Australia
KEY TO GENERA OF DASYPHILEAE
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1. Axial cells with whorls of 6 whorl -branchlets; carposporophyte covered only by whorl-branchlets; tetrasporangia terminal on short pedicels | DASYPHILA |
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1. Axial cells with whorls of 5 whorl-branchlets; carposporophyte with involucral branchlets arising from sterile cells adjacent to the procarp; tetrasporangia sessile | MUELLERENA |
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