Ulva Australis Areschoug 50.470

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Ulva australis Areschoug 50.470 MACRO foliose Techniques needed and plant shape PLANT Classification Phylum: Chlorophyta; Order: Ulvales; Family: Ulvaceae *Descriptive name bunched sea lettuce; §southern sea lettuce Features plants light green above, darker below, 40-200mm tall, of several sheet-like blades branched near the plant base, blades only slightly longer than broad, edges without microscopic teeth, plant base with thick mass of rhizoids Special requirements view a cross section of a blade microscopically to see 2 sheets of cells and cells longer than broad Occurrences throughout southern Australia Usual Habitat usually on moderately rough coasts in the lower intertidal and upper sub tidal Similar Species Ulva lactuca but that species is rarer, found in calmer waters and has thinner blades with fewer rhizoids. U. rigida is similar but has generally fewer branches, and the margins are minutely toothed. Description in the Benthic Flora Part I, pages 141-3, 145 Details of Anatomy 1. 2. 4. 3. Ulva australis stained blue and viewed microscopically 1. torn base of a frond viewed from above, showing the thick central mass of rhizoids (slide 7498) 2. surface view of cells mainly randomly arranged (slide 7498) 3, 4. cross sections showing cells longer than broad (L/B ~ 1) (slide 6582) Descriptive names are inventions to aid identification, and are not commonly used. § name used in Edgar, G. Australian Marine Life, 2nd Ed. (2008) “Algae Revealed” R N Baldock, S Australian State Herbarium, October 2003, additions October 2009 5. 6. 7. 8. 9. 5-7. specimens of Ulva australis Areschoug from S Australia (#5, A 71268; #6 A55448, 100mm deep on pontoon, Port; A53120, 8m deep between Granite I., and Wright I., Victor Harbor 8, 9. two microscope views of unstained preparations (A70443) (#8, surface view of cells, #9cross section of a blade) Descriptive names are inventions to aid identification, and are not commonly used. § name used in Edgar, G. Australian Marine Life, 2nd Ed. (2008) “Algae Revealed” R N Baldock, S Australian State Herbarium, October 2003, additions October 2009 .

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