Electronic Flora of South Australia Species Fact Sheet

Zonaria angustata (Kützing) Papenfuss 1952: 170.

Phylum Phaeophyta – Order Dictyotales – Family Dictyotaceae – Tribe Zonarieae

Selected citations: Womersley 1967: 224.

Synonym

Phycopteris angustata Kützing 1859: 28, pl. 69 fig. I.

Thallus (Fig. 88A) dark brown, (4–) 8–15 (–18) cm long, much branched, branches corn-planate but often slightly twisted, with stupose lower axes 1–3 mm thick and a matted rhizoidal holdfast 5–15 (–25) mm across and 10–25 mm long; epilithic. Fronds (Fig. 89A) irregularly alternately branched by apical splitting, branches more or less linear but with short, often spinous, laterals, 1–2 (–3) mm broad throughout [young plants or basal parts usually 4–10 (–20) mm broad], sometimes with a central line of darker cells. Structure (6–) 8–10 cells and (110–) 150–180 (–190)mm thick throughout. with cells in regular rows in transverse section (Fig. 89B); cortical cells mostly in pairs over each medullary row in transverse section, (2–) 4–6 (–7) to each medullary cell lengthwise, 10–15 (–18) µm across (each, when paired) in surface view, L/B 1–2. Hair tufts (Fig. 89A) scattered or in curved, concentric lines; hairs phaeophycean, ( 0-)14–18 µm in diameter.

Reproduction: Sori of sporangia (Fig. 89A,B) scattered, ovate, on mid and upper branches, (0.5–) 1–1 mm long and (0.2–) 0.5–1 (–1.5)mm across, indusiate and without cellular paraphyses; sporangia (Fig. 89B) clavate to ovoid, (100–) 120–170 Arn long and 60–90 µm in diameter, with 8 spores, without a stalk cell. Oogonial sori (Fig. 89C) irregularly ovate, 0.2–1 mm long, 0.2–0.5 mm across; oogonia (Fig. 89D) clavate to elongate-ovoid, with a stalk cell, 80–100 µm long and 25–40 µm in diameter. Antheridial sori (Fig. 89E) reddish-brown, ovate to irregular in shape, (0.5–) 1–2 mm long and 0.2–0.6 mm across, antheridia (Fig. 89F) compactly clustered, arising from each cortical cell and of similar diameter, 30–50 µm long and 8–12 µm in diameter.

Type from Gulf St Vincent, S. Aust. (Mueller); in MEL, 16912.

Selected specimens: Elliston, S. Aust., 5 m deep in bay (Shepherd, 24.x.1973; ADU, A44265). Brighton, S. Aust., drift (Bienert, 12.xi.1965; ADU, A29660, sporangial, female and male plants). Aldinga, S. Aust., reef pools ( Womersley, 26.ix.1965; ADU, A29582. Pennington Bay, Kangaroo I., S. Aust., sublittoral fringe (Womersley, 23.viii.1950; ADU, A13388). Yilki, Victor Harbor, S. Aust., drift (Womersley, 30.ix.1985; ADU, A56790). Port MacDonnell, S. Aust., drift ( Womersley, 16.x.1985; ADU, A57001). Newfield Bay, Peterborough, Vic., upper sublittoral pools (Womersley, 10.xii.1969; ADU, A34808-"Marine Algae of southern Australia" No. 42). Queenscliff, Vic., drift ( Womersley, 12.x.1982; ADU, A55364). Walkerville, Vic. drift (Sinkora A1584, 23.ii-9.iii.1972; ADU, A43107). Greens Beach, N. Tas., drift (Womersley, 9.xi.1982; ADU, A55575). Great Taylor Bay, Bruny I., Tas., 2–7 m deep (Shepherd, 7.ii.1970; ADU, A35552). Eden, N.S.W. (Lucas, Jan. 1910; NSW).


Distribution map based
on current data relating to
specimens held in the
State Herbarium of SA

Distribution: From Elliston, S. Aust. to Eden, N.S.W., and around Tasmania.

Taxonomic notes: Z. angustata is often common in rock pools and the upper sublittoral on rough-water to moderate coasts, being known from low tide level to 22 m deep. It is unusual for a Zonaia in that the sporangial sori are without paraphyses, but otherwise it is typical of this genus. Sexual plants are rare. Z. angustata was incorrectly recorded from New Zealand by Lindauer et al. 1961, p. 197 (=Z. turneriana J. Agardh).

References:

KÜTZING, F.T. (1859). Tabulae Phycologicae. Vol. 9. (Nordhausen.)

LINDAUER, V.W., CHAPMAN, V.J. & AIKEN, M. (1961). The marine algae of New Zealand. II. Phaeophyceae. Nova Hedwigia 3, 129–350, Plates 57–97.

PAPENFUSS, G.F. (1952). Notes on South African marine algae. III. J. S. Afr. Bot. 17, 167–188.

WOMERSLEY, H.B.S. (1967). A critical survey of the marine algae of southern Australia. II. Phaeophyta. Aust. J. Bot. 15, 189–270.

The Marine Benthic Flora of Southern Australia Part II complete list of references.

Author: H.B.S. Womersley

Publication: Womersley, H.B.S. (14 December, 1987)
The Marine Benthic Flora of Southern Australia
Part II
©Board of the Botanic Gardens and State Herbarium, Government of South Australia


Illustrations in Womersley Part II, 1997: FIGS 88A, 89 A–F.

Figure 88 image

Figure 88   enlarge

Fig. 88. A. Zonaria angustata (ADU, A55364). B. Zonaria crenata (ADU, A46629).

Figure 89 image

Figure 89   enlarge

Fig. 89. A–F. Zonaria angustata (ADU, A29660). A. Branches with sporangial sori with indusia. and hair tufts. B. Transverse section of thallus with sporangia. C. Branch with oogonial sori and hair tufts. D. Transverse section of thallus with oogonia. E. Branch with antheridial sori. F. Transverse section of thallus with antheridia. G–I. Zonaria crenata (ADU, A30714). G. Surface view of thallus with hydroid network and sporangial sori. H. Longitudinal section of apex showing segmentation. 1. Transverse section of thallus with sporangia and paraphyses.


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