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

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Halophila decipiens Ostenfeld Halophila decipiens (Plate 1) is currently known from only two locations in the Red Sea. Jacobs and Dicks (1985) recorded it in the Gulf of Suez at 30 m depth and the Author recorded it in 7 m and 42 m of water off the southern Egyptian coast. The distribution of this species in the Red Sea is otherwise unknown, but likely to be found throughout in suitable habitat. Morphology Leaf The leaf blade is up to 2.5 cm long, 0.5 cm wide and paddle-shaped. It has hairs on both side of the leaf blade. There are 6-9 unbranched cross leaf veins. The margin of the leaf is finely serrated and the leaf tip is rounded. Stem The petioles are 3-15 mm long, each bearing pairs of leaves. Petioles develop directly from the rhizome. Rhizome The rhizome is smooth, thin and elongated. 36
Microscopic Leaf Anatomy Cells angular to hexagonal in shape (Plate 2). Similar Species • Halophila ovalis and Halophila ovata have less elongated and broader leaf blade and do not have hairs on the leaf blades. • Halophila stipulacea has a lopsided sheath structure on each leaf pair. Key Features • Rhizome is thin (Plate 3). • Paddle shaped leaves with fine serrations along margin but only visible clearly with a magnifying lens. • Long petioles arising directly from the rhizome (Plate 3). Diagnostic Features • Dense hairs on both sides of leaf blade but requires a magnifying lens to see clearly (Plate 4). Sometimes sediment will adhere to hairs on the leaf blade as shown in Plate 5. Habitat Shallow Coastal/Back Reef Reef Deep Coastal Field Guide to Seagrasses of the Red Sea 37
Page 1: 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: Leaf blade Mag. 20x Close-up area (
Page 49 and 50: Halophila ovalis (R. Brown) Hooker
Page 51 and 52: Dark colored dots Close-up area Ova
Page 53 and 54: Rhizome The rhizome is smooth, thin
Page 55 and 56: Halophila stipulacea (Forsskål) As
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

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

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