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Electronic Flora of South Australia Species Fact Sheet
Phylum Rhodophyta – Family Rhodomelaceae – Tribe Chondrieae
Synonym
Chondriopsis succulenta var. subfasciculata J. Agardh 1892: 155.
Thallus (Fig. 194A) brown-red, (8–) 25–45 cm high, much branched irregularly radially for 3–4 orders, branches erect or spreading, terete, axillary branches usually present; lower axes 1.2–2 mm in diameter, grading to lesser branchlets 500–700 µm in diameter. Holdfast discoid, 1–2 mm across; epiphytic (on Amphibolis) or epilithic. Structure. Apices slightly pointed or depressed, with 5 pericentral cells (Fig. 194B) and surrounding inner cortical cells often distinctly larger than the pericentral cells, with rhizoids around the axial and pericentral cells in the lower thallus; epidermal cells 20–30 µm in diameter, L/D 2–5 (–9); secondary cortex absent. Cell wall thickenings (Fig. 194B, C) initially as massive caps on the upper end of pericentral cells and larger cortical cells, later as circular bands on central outer and radial walls. Cells with discoid to elongate rhodoplasts, chained in larger cells.
Reproduction: Procarps not observed. Carposporophytes with a basal fusion cell and branched gonimoblast with clavate terminal carposporangia 40–75 µm in diameter. Cystocarps (Fig. 194D) ovoid to slightly urceolate, 1–1.5 mm in diameter, short-stalked, without a spur; pericarp ostiolate, 3–4 cells thick, lightly corticate. Spermatangial plates unknown.
Tetrasporangia (Fig. 194E) in lesser branchlets, on (1–) 2–3 pericentral cells per axial cell, 180–220 µm in diameter.
Lectotype from Symons Channel, Port Phillip Heads, Vic. (Wilson 52B, 9.i.1884); in Herb. Agardh, LD, 37785.
Selected specimens: Double Corner Beach, Portland. Vic., drift (Beauglehole, 14.vii.1951; AD, A21542). Flinders, Vic., drift (Gordon-Mills, 9.xii.1983; AD, A55303). San Remo, Vic., drift on "back beach" (Sinkora A2029, 27.xi.-5.xii.1974; AD, A56587; MEL, 608556). Bridport, Tas., drift (Parsons & Womersley, 6.xi.1982; AD, A53762). Gordon, Tas., drift (Curtis, 3.ii.1965; HO, 66097).
Distribution: Portland to San Remo, Vic., and N and SE Tasmania.
Taxonomic notes: Chondria subfasciculata is closely related to C. succulenta, differing in having cell wall thickenings only on the pericentral cells (except in the lower thallus), in lacking a spur on the cystocarp, and in having larger tetrasporangia (180–220 µm in diameter compared to 120–150 µm in C. succulenta).
References:
AGARDH, J.G. (1892). Analecta Algologica. Acta Univ. lund. 28, 1–182, Plates 1–3.
GORDON-MILLS, E.M. & WOMERSLEY, H.B.S. (1987). The genus Chondria C. Agardh (Rhodomelaceae, Rhodophyta) in southern Australia. Aust. J. Bot. 35, 477–565.
The Marine Benthic Flora of Southern Australia Part IIID complete list of references.
Publication:
Womersley, H.B.S. (24 February, 2003)
The Marine Benthic Flora of Southern Australia
Rhodophyta. Part IIID. Ceramiales – Delesseriaceae, Sarcomeniaceae, Rhodomelaceae
Reproduced with permission from The Marine Benthic Flora of Southern Australia Part IIID 2003, by H.B.S. Womersley. Australian Biological Resources Study, Canberra. Copyright Commonwealth of Australia.
Illustration in Womersley Part IIIA, 2003: FIG. 194.
Figure 194 enlarge
Fig. 194. Chondria subfasciculata (A, B, E, AD, A56587; C, D, AD, A53762). A. Habit. B. Transverse section of axis, with cell wall thickenings. C. Longitudinal view of branch, with cell wall thickenings. D. Cystocarp. E. Branch with tetrasporangia.
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