Electronic Flora of South Australia Species Fact Sheet
Phylum Chlorophyta – Order Ulvales – Family Ulvaceae
Selected citations: Kapraun & Flynn 1973: 148, figs 15–17. Womersley 1971a, 113, fig. I.
Monostroma oxysperma (Kützing) Doty 1947: 12. Kornmann 1964: 17.
Thallus (Fig. 42B) light to medium green, delicate but fairly firm, somewhat shiny when partly dried, 2–8 (–12) cm high and usually as much across, irregularly foliose, often with ruffled marginal parts but usually without lobes, usually epilithic, attached by rhizoids from the basal cells (Fig. 43D); thallus 10–15 (–20) µm thick. Cells (Fig. 43C) of the expanded blade irregularly polygonal to rounded, 7–15 µm across with gelatinous walls, mostly irregularly arranged but sometimes in groups or in rows; chloroplast filling most of the cell, with 1 (–2) prominent pyrenoids.
Reproduction: Reproduction (Bliding 1968, p. 587) by biflagellate zoospores only, formed in marginal cells of the thallus.
Type from the Baltic Sea; in L (938, 53...82a).
Selected specimens: Kellidie Bay, Coffin Bay, S. Aust., mid eulittoral ( Womersley, 22.viii.1967; ADU, A31874-"Marine Algae of southern Australia" No. 1 b). Proper Bay, Port Lincoln, S. Aust., mid eulittoral (Womersley, 21.viii.1967; ADU, A31812-"Marine Algae of southern Australia No. la). Noonameena, Coorong, S. Aust. (Robertson, 27.viii.1976; ADU, A47260) Crawfish Rock, Westernport Bay, Vic., mid eulittoral ( Womersley, 29.viii.1971; ADU, A39439). Louisville, Tas., on Heterozostera (Olsen, 6.ix.1967; ADU, A31965).
Distribution: Widely distributed on temperate coasts within the mid to upper eulittoral, usually under sheltered conditions, and often where salinity varies considerably.
Taxonomic notes: In southern Australia, from Coffin Bay, S. Aust. to Crawfish Rock, Westernport Bay, Vic., Botany Bay, N.S.W. and south-east Tasmania, usually mid eulittoral, in sheltered localities.
Bliding (1968, pp. 585, 590) recognizes three varieties of U. oxysperma but the differences between them appear slight.
In southern Australia, U. oxysperma is found mainly during winter (April to October) in mid eulittoral habitats.
BLIDING, C. (1968). A critical survey of European taxa in Ulvales, II. Ulva, Ulvaria. Monostroma, Kornmannia. Bot. Notiser 121, 535–629.
DOTY, M.S. (1947). The marine algae of Oregon. Part I. Chlorophyta and Phaeophyta. Farlowia 3, 1–65.
KAPRAUN, D.F. & FLYNN, E.H. (1973). Culture studies of Enteromorpha linza (L.) J.Ag. and Ulvaria oxysperma (Kützing) Bliding (Chlorophyceae, Ulvales) from Central America. Phycologia 12, 145–152.
KORNMANN, P. (1964). Über Monostroma bullosum (Roth) Thuret und M. oxyspermum (Kutz.) Doty. Helgoländer wiss. Meeresunters. 11, 13–21.
WOMERSLEY, H.B.S. (1971a). New records and taxa of marine Chlorophyta in southern Australia. Trans. R. Soc. S. Aust. 95, 113–120.
The Marine Benthic Flora of Southern Australia Part I complete list of references.
Womersley, H.B.S. (31 May, 1984)
The Marine Benthic Flora of Southern Australia
©Board of the Botanic Gardens and State Herbarium, Government of South Australia
Illustrations in Womersley Part I, 1984: FIGS 42B, 43C, D.
Figure 42 enlarge
Fig. 42. A. Percursaria percursa (ADU, A52661). B. Ulvaria oxysperma (ADU, A31812). C. Ulvaria shepherdii (ADU, A33006). D. Blidingia minima (ADU, A31811). E. Blidingia marginata (ADU, A21065).
Figure 43 enlarge
Fig. 43. A,B. Percursaria percursa (ADU, A52661). A. Biseriate filament, face view. B. Side view of filament. C,D. Ulvaria oxysperma (ADU, A31874). C. Cells near thallus margin. D. Lower part of thallus with cells developing attachment rhizoids. E–G. Ulvaria shepherdii (ADU, A33006). E. Cells in upper thallus. F. Lower cells with rhizoids. G. Cross section of thallus near base, with rhizoid producing cells. H,I. Blidingia minima (ADU, A53181). H. Cells in upper thallus. I. Base of thallus. J,K. Blidingia marginata (ADU, A52990). J. Cells in upper thallus. K. Base of thallus.
State Herbarium of South Australia