Green algae

Green seaweeds have a variety of growth forms which include filamentous, tubular, sheet-, net- or frondlike thalli. Families are differentiated by the organisation of their cells which are either microscopic or larger (to 1 mm long) or form single cell filaments to 10 cm long or single celled plants to a metre long.


Ulva rigida and Ulva lactuca

common name: sea lettuce
features: thin sheetlike individual fronds or tufts resembling lettuce leaves, 20-50 mm in height, although larger plants may occur particularly during blooms.
habitat: sheltered and wave swept rocky shores or floating in very sheltered areas in Moreton Bay.
blooms: in winter.

Ulva paradoxa (formerly Enteromorpha paradoxa)

common name: none
features: light green, very slender, soft, branched, tubular thallus, 2-20 cm long, main branches 50-200 µm wide with younger branches 20-50 µm wide.
habitat: attached to firm substrata, epiphytic on seagrasses or loose lying in calm areas.
blooms: in Hervey Bay during spring and summer.

Cladophora prolifera

common name: none
features: dark green, firm, much branched, dense spreading tufts to 15 cm high with branches 350-450 µm wide near the base tapering to 100-220 µm wide near the plant growing tip or apex.
habitat: attached to rocks or loose lying in calm areas.
blooms: on the west coast of South Stradbroke Island.