. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 1. Mature branch with hemispherical conceptacles. 2. Immature branch - note swollen segment ends. 3. Longitudinal section showing one alternating short to five long cells.. 100 Atm 1. Branch showing joints generally not at forks. 2. Mature branch with raised conceptacles. 3. Longitudinal section showing one alternating short to two long cells and smaller surface cells. Corallinaceae, Corallinales Amphiroa fragilissima (Linnaeus) Lamouroux 1816:298. Corallina fragilissima Linnaeus 1758:806. Thallus entangled, f

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. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 1. Mature branch with hemispherical conceptacles. 2. Immature branch - note swollen segment ends. 3. Longitudinal section showing one alternating short to five long cells.. 100 Atm 1. Branch showing joints generally not at forks. 2. Mature branch with raised conceptacles. 3. Longitudinal section showing one alternating short to two long cells and smaller surface cells. Corallinaceae, Corallinales Amphiroa fragilissima (Linnaeus) Lamouroux 1816:298. Corallina fragilissima Linnaeus 1758:806. Thallus entangled, fragile, calcareous, dense clumps or mats; to 8 cm thick; yellow-green to white-pink; branching widely dichotomous, occasionally trichotomous, primarily at uncalcified joints; branches thin, brittle, jointed, cylindrical, often swollen at segment ends; holdfast crust-like, inconspicuous. Lower segments 150-600 /xm diam., 8-20 times as long; medulla 4-8 transverse rows of long cells (55-90 /urn long) alternating with 1-2 rows of short cells (15-35 /xm long); surface several layers of short cells increasing in thickness with age; joint structure similar; conceptacles lateral on calcified segments, hemispherical, 300-340/xm diam. with terminal pore; tetrasporangia 25 /xm diam., 50 /xm long. Fracture zone specimens: Seagrass bed of east fracture, 3 m deep on mangrove peat, 16.ii.1993, D&M Littler 250095 (US). Seagrass bed of central fracture, 3 m deep on mangrove peat, 16.ii.1993, D&M Littler 25020 (US). Seagrass bed of west fracture, 3 m deep on mangrove peat, 20.ii.1993, D&M Littler 25130 (US). Wall of east fracture, 4 m deep on mangrove peat, 16.ii.1993, D&M Littler 25076 (US). Wall of central fracture, 4 m deep on mangrove peat, 16.ii.1993, D&M Littler 25052 (US). Wall of west fracture, 4 m deep on mangrove peat, 20.ii.1993, D&M Littler 25165 (US). Bottom of east fracture, 7 m deep on mangrove peat, 16.ii.1993, D&M Littler 25123 (US). Amphiroa rigida