Callithamnion obstipum (Cowling, Kraft & J.A.West) Womersley 1998

Publication Details
Callithamnion obstipum (Cowling, Kraft & J.A.West) Womersley 1998: 237-239

Published in: Womersley, H.B.S. (1998). The marine benthic flora of southern Australia - Part IIIC. Ceramiales - Ceramiaceae, Dasyaceae. pp. [1]-535, 235 figs, 4 col. figs in 2 pls. Canberra & Adelaide: Australian Biological Resources Study & State Herbarium of South Australia.

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Publication date: "Published 24 December 1998"

Type Species
The type species (lectotype) of the genus Callithamnion is Callithamnion corymbosum (Smith) Lyngbye.

Status of Name
This name is currently regarded as a synonym of Aglaothamnion obstipum Cowling, Kraft & J.A.West.

Basionym
Aglaothamnion obstipum Cowling, Kraft & J.A.West

Type Information
Type locality: Gloucester Reserve, Williamstown, Victoria; (Cowling, Kraft & West 1998: 34) Holotype: G.T.Kraft and G.W.Saunders; 3 March 1995; Epiphytic on Mesophyllum spp. at 3-5 m depths; MELU; K10543 (Cowling, Kraft & West 1998: 34)

General Environment
This is a marine species.

Description
Thallus erect, medium red-brown, 1–2 cm high, distichously branched, with laterals for 2–3 orders, ecorticate throughout except for loose rhizoidal cortication over lowest few cells. Branchlets markedly slenderer than parent axes. Attachment by a rhizoidal holdfast; epilithic or on jetty piles. Structure. Lower axes 160–250 µm in diameter, cells with a thick wall, L/D 1–1.5 (–2); lateral branchlets prominently alternately distichous with ultimate filaments 6–14 cells long and unbranched, usually with an abaxial branch from the basal cell, lower cells 40–55 µm in diameter and L/D 2–3, tapering to 18–30 µm in diameter and L/D 2–3 at 3–4 cells below apices, then to smaller apical cells with rounded ends. Cells uninucleate; rhodoplasts discoid, ribbon-like in older cells and longitudinally aligned.

Reproduction: Gametophytes dioecious. Procarps borne on axial cells, with two periaxial cells one of which (the supporting cell) bears the 4-celled carpogonial branch; post-fertilization each periaxial cell cuts off an auxiliary cell and 1 or 2 rounded lobes 90–180 µm across of carposporangia 15–25 µm across; a loose involucre of branched filaments develops from 1 or 2 cells below the carposporophyte. Spermatangia) on small clusters on ultimate branches, 1–3 per parent cell, branched 2–3 times, spermatangia ovoid, 2–3 µm in diameter.

Tetrasporangia sessile and adaxial on lower cells of the ultimate branchlets, ovoid, 35–55 µm in diameter, sub-decussately to tetrahedrally divided.

Created: 23 July 2001 by G.M. Guiry.

Last updated: 28 December 2010

Verification of Data
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Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=25846

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 28 December 2010. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 28 March 2024

 
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