. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 1 mm 1. Habit of plant. 2. Marginal teeth. 3. Leaf apex with marginal veins meeting center vein. MAGNOLIOPHYTA Hydrocharitaceae, Butomales Halophila decipiens Ostenfeld 1902:260, with fig. Plants delicate, small, in leafy patches; to 1 m in diam.; bright green; stem slender, 3-15 mm long; leaves to 3 mm wide, 3-6 mm long, oval, one pair per node; leaf margin with extremely fine teeth; rhizome extensive; major root descending below each pair of leaves, soon covered by fine rootlets. Leaves with central vein of
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 1 mm 1. Habit of plant. 2. Marginal teeth. 3. Leaf apex with marginal veins meeting center vein. MAGNOLIOPHYTA Hydrocharitaceae, Butomales Halophila decipiens Ostenfeld 1902:260, with fig. Plants delicate, small, in leafy patches; to 1 m in diam.; bright green; stem slender, 3-15 mm long; leaves to 3 mm wide, 3-6 mm long, oval, one pair per node; leaf margin with extremely fine teeth; rhizome extensive; major root descending below each pair of leaves, soon covered by fine rootlets. Leaves with central vein of rectangular cells; margin veins splitting from central vein at leaf base, paralleling margin, meeting central vein again just below leaf apex; rhizome mm diam.; roots mm diam.; rootlets colorless, 10-20/xm diam. Fracture zone specimens: Wall of east fracture, 4 m deep on mangrove peat, , D&MLittler 25080 (US). Bottom of east fracture, 7 m deep on mangrove peat, , D&M Littler 25111 (US). Bottom of central fracture, 7 m deep on mangrove peat, , D&M Littler 25004 (US). Bottom of west fracture, 7 m deep on mangrove peat, , D&M Littler 25180 (US).. 1. Habit of plant. 2. Blade apex with parallel veins. Hydrocharitaceae, Butomales Thalassia testudinum Banks in Konig 1805:96. Plants erect, coarse, grass-like; grass-green; leaves strap shaped, 4-12 mm wide, 10-60 cm tall; rhizomes extensive, creeping, stoloniferous, 3-6 mm diam.; roots fine, fibrous, abundant. Leaves having 9-15 parallel veins, connected by perpendicular cross veins at approximately 1 mm intervals; margins smooth, distally with minute spines. Fracture zone specimens: Seagrass bed of east fracture, 3 m deep on mangrove peat, , D&M Littler 25105 (US). Seagrass bed of central fracture, 3 m deep on mangrove peat, , D&M Littler 25018 (US). Seagrass bed of west fracture, 3 m deep on mangrove peat, , D&M Littler 25
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