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Aglaothamnion obstipum Cowling, Kraft & J.A.West 1998

Publication details
Aglaothamnion obstipum Cowling, Kraft & J.A.West 1998: 33-37, figs 2-11

Published in: Cowling, R., Kraft, G.T. & West, J.A. (1998). Taxonomic and culture studies of Aglaothamnion obstipum sp. nov. (Ceramiaceae, Rhodophyta) from southeastern Australia. Botanica Marina 41: 31-41.

Type species
The type species (holotype) of the genus Aglaothamnion is Aglaothamnion furcellariae (J.Agardh) Feldmann-Mazoyer.

Status of name
This name is of an entity that is currently accepted taxonomically.

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).

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

Taxonomic notes
According to Womersley (1998) this is the basionym of Callithamnion obstipum (Cowling, Kraft & West)Womersley.

General environment
This is a marine species.

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.

Detailed distribution with sources (Click to Load)

Created: 15 February 1998 by M.D. Guiry

Verified by: 28 December 2010 by M.D. Guiry

Accesses: This record has been accessed by users 461 times since it was created.

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(Please note: only references with the binomials in the title are included. The information is from the Literature database.)

Cowling, R., Kraft, G.T. & West, J.A. (1998). Taxonomic and culture studies of Aglaothamnion obstipum sp. nov. (Ceramiaceae, Rhodophyta) from southeastern Australia. Botanica Marina 41: 31-41.

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Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 22 September 2021.

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