. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 1. Habit of plant. 2. Dichotomous branching of branchlet. 3. Forked branchlet apices. Caulerpa verticillata J. Agardh 1847:6. Thallus fine, fibrous, felt-like mats, rarely as individual strands; of indeterminate area, to 7 cm tall; dark green; fronds delicately whorled, 5-8 mm diam.; rhizomes creeping, stoloniferous, slender; rhizoids few, branched. Branchlets 5-7 times dichotomous, 100-210 /xm diam. at base, 30-40 yum at apex, lower segments 10 or more diameters long; apices abruptly forked, pointed; stalk 14
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 1. Habit of plant. 2. Dichotomous branching of branchlet. 3. Forked branchlet apices. Caulerpa verticillata J. Agardh 1847:6. Thallus fine, fibrous, felt-like mats, rarely as individual strands; of indeterminate area, to 7 cm tall; dark green; fronds delicately whorled, 5-8 mm diam.; rhizomes creeping, stoloniferous, slender; rhizoids few, branched. Branchlets 5-7 times dichotomous, 100-210 /xm diam. at base, 30-40 yum at apex, lower segments 10 or more diameters long; apices abruptly forked, pointed; stalk 140-200 /xm diam.; rhizome to 560/xm diam. Fracture zone specimens: Wall of east fracture, 4 m deep on mangrove peat, , D&MLittler 25064 (US). Wall of central fracture, 4 m deep on mangrove peat, , D&M Littler 25057 (US). Bottom of east fracture, 7 m deep on mangrove peat, 1993, D&M Littler 25122 (US). Bottom of central fracture, 7 m deep on mangrove peat, , D&M Littler 25017 (US). Udoteaceae, Bryopsidales. 1. Surface siphon of blade. 2. Habit of plant Avrainvillea nigricans Littler & Littler 1992:402, fig. 17. Thallus solitary, seldom clustered; to 16 cm tall; pale green to brown-green, fringed in black; mature blades kidney shaped to oval, 15 cm long, 23 cm wide, thin (<2 mm), loosely woven; margins smoothly rounded, lacerate, or ragged; blade base flat or lobed; zonation faint; stipe to l-4(-9) cm long, narrow, cylindrical, seldom branched; rhizoidal mass bulbous. Blade inner siphons 30-40 /xm in diam., moniliform; blade surface siphons 20-30 /xm diam., deeply moniliform, forming loose cortex; stipe central siphons 30-60/xm diam., slightly moniliform; stipe surface siphons 10-20/xm diam., deeply moniliform. Fracture zone specimens: Seagrass bed of east fracture, 3 m deep on mangrove peat, , D&M Littler 25089 (US). Seagrass bed of west fracture, 3 m deep on mangrove peat, , D&a
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