Field Guide to Seagrasses of the Red Sea - Seagrass-Watch

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(Plate 1) Thin smooth rhizome Petiole Oval shaped leaf blade Unbranched cross veins Scales Wide space between cross veins (Plate 2) (Plate 3) 44
Halophila stipulacea (Forsskål) Ascherson Halophila stipulacea (Plate 1) has been recorded from all countries bordering the Red Sea (Green & Short, 2003), and is one of the most common species. It is more abundant in the northern Red Sea compared with the central and southern Red Sea (Green & Short, 2003). This species has been recorded from shallow depths to 70 m of water (Lipkin, 1979). It entered the Mediterranean Sea after the Suez Canal was built, and is now found in many areas of the eastern Mediterranean as an introduced species. In the Egyptian Red Sea, this species commonly occurs in large single-species meadows in water depths exceeding 10 m. Specimens tend to be larger in deeper water (Lipkin, 1979), which may be an adaptation to lower levels of light at greater depths. Morphology Leaf The leaf blade is up to 6 cm long and 0.8-1.0 cm wide, and is linear to oblong in shape. The leaf sheath is a large transparent scale covering a short petiole. Leaf veins consist of 10-40 branched cross veins with a clear and obvious mid vein (Plate 1). An unusual leaf structure observed in the Red Sea is called ‘bullose’, which is a bulging section on the leaf surface (Waycott, et al., 2004). The leaf margin is serrated and minute hairs may be present on one side of the leaf surface. The leaf tip is rounded, and distinctly serrated. Stem Two short stems, each carrying two leaves. Field Guide to Seagrasses of the Red Sea 45
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Seagrasses Field Guide to of the Re
Page 4 and 5: The designation of geographical ent
Page 7: Foreword The role of taxonomy in un
Page 10 and 11: viii
Page 12 and 13: history. Peter Forsskål, a Swedish
Page 14 and 15: Figure 1. Schematic map represents
Page 17 and 18: Shallow coastal habitat Seagrass me
Page 19 and 20: Bay (or Sharm) A Sharm is the Arabi
Page 21 and 22: An individual seagrass plant consis
Page 23 and 24: Cymodocea rotundata Ehrenberg & Hem
Page 25 and 26: Leaf tip Close-up area Two tips on
Page 27 and 28: Microscopic Leaf Anatomy Cells are
Page 29 and 30: Halodule pinifolia (Miki) den Harto
Page 31 and 32: Leaf blade Close-up area Leaf sheat
Page 33 and 34: Stem The stems are short, erect and
Page 35 and 36: Syringodium isoetifolium (Ascherson
Page 37 and 38: Cylindrical leaf blade Close-up are
Page 39 and 40: Microscopic Leaf Anatomy Cells are
Page 41 and 42: Wide flat leaf sheath Leaf scars on
Page 43 and 44: Enhalus acoroides (L.f.) Royle Enha
Page 45 and 46: Leaf blade Mag. 20x Close-up area (
Page 47 and 48: Microscopic Leaf Anatomy Cells angu
Page 49 and 50: Halophila ovalis (R. Brown) Hooker
Page 51 and 52: Dark colored dots Close-up area Ova
Page 53: Rhizome The rhizome is smooth, thin
Page 57 and 58: Leaf blade Mid vein Lopsided leaf s
Page 59 and 60: Microscopic Leaf Anatomy Cell shape
Page 61: Glossary Bullose: bulb-shaped or bu
Page 64 and 65: Lipkin, Y. (1977). ‘Seagrass vege
Page 66: About the Guide This guide answers
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Field Guide to Seagrasses of the Red Sea - Seagrass-Watch

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