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Questions and Answers
Which of the following species has very long ribbon-like leaves with enrolled leaf margins?
Which of the following species has very long ribbon-like leaves with enrolled leaf margins?
- Zostera capricorni
- Syringodium isoetifolium
- Halophila decipiens
- Enhalus acoroides (correct)
What is the leaf blade length of Halophila decipiens?
What is the leaf blade length of Halophila decipiens?
1-2.5 cm
Halophila ovalis has more than eight pairs of cross veins.
Halophila ovalis has more than eight pairs of cross veins.
False (B)
Which species is known for its fern-like structure and erect shoots up to 15 cm long?
Which species is known for its fern-like structure and erect shoots up to 15 cm long?
Describe the leaf structure of Thalassia hemprichii.
Describe the leaf structure of Thalassia hemprichii.
Cymodocea rotundata has a __ leaf tip and a wide leaf blade.
Cymodocea rotundata has a __ leaf tip and a wide leaf blade.
Which species has cylindrical leaves that taper to a point?
Which species has cylindrical leaves that taper to a point?
Match the following seagrass species with their characteristics:
Match the following seagrass species with their characteristics:
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Study Notes
Enhalus acoroides
- Long ribbon-like leaves with enrolled leaf margins
- Thick rhizome with long black bristles and cord-like roots
- Leaves can grow up to 150 cm long
Halophila capricorni
- Small oval leaf blade, 1-2.5 cm long
- 6-8 cross veins
- Leaf hairs on both sides
Halophila decipiens
- Small oval leaf blade
- 6-8 cross veins
- Leaf hairs on both sides
Halophila minor
- Less than eight pairs of cross veins
- Small oval leaf blade
Halophila ovalis
- Eight or more cross veins
- No hairs on leaf surface
Halophila spinulosa
- Fern-like leaves arranged in opposite pairs
- Erect shoot up to 15 cm long
Halophila tricostata
- Short black bars of tannin cells on leaf
- Thick rhizome with scars between shoots
- "Sickle-shaped" leaves
- Leaves 10-40 cm long
Thalassia hemprichii
- Rounded leaf tip
- Narrow leaf blade (2-4mm wide)
- Leaves 7-15 cm long
- 9-15 longitudinal veins
- Well-developed leaf sheath
Cymodocea rotundata
- Rounded leaf tip
- Narrow leaf blade (2-4mm wide)
- Leaves 7-15 cm long
- 9-15 longitudinal veins
- Well-developed leaf sheath
Cymodocea serrulata
- Serrated leaf tip
- Wide leaf blade (5-9 mm wide)
- Leaves 6-15 cm long
- 13-17 longitudinal veins
Halodule uninervis
- Trident leaf tip
- 1 central vein
- Usually pale rhizome, with clean black leaf scars
Halodule pinifolia
- Cylindrical in cross-section
- Leaf tip tapers to a point
- Leaves 7-30 cm long
Syringodium isoetifolium
- Cluster of ribbon-like curved leaves at the end of a very long elongate shoot
- "Woody" rhizome
- Erect shoots 10-65 cm long
Thalassodendron ciliatum
- Thin, translucent leaf blades
- 5 longitudinal veins
- Cross veins
Zostera capricorni
- Thin, translucent leaf blades
- 5 longitudinal veins
- Cross veins
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