. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 31 PHAEOPHYTA Dictyotaceae, Dictyotales. 1. Habit of blades showing cervicorn branching pattern. 2. Cross section. Dictyota cervicornis Kutzing 1859:11, pi. 24, fig. 2. Thallus bushy; to 20 cm tall; olive-brown; branching dichotomously asymmetrical (cervicorn - one branch terminating development); branches mm wide, often twisted or spiral, apices pointed; holdfast small, fibrous, mat-like. Blades 180-360 /im thick, 10-25 medulla cells wide; medulla cells in 1 layer, rectangular, arranged in rows; surface
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 31 PHAEOPHYTA Dictyotaceae, Dictyotales. 1. Habit of blades showing cervicorn branching pattern. 2. Cross section. Dictyota cervicornis Kutzing 1859:11, pi. 24, fig. 2. Thallus bushy; to 20 cm tall; olive-brown; branching dichotomously asymmetrical (cervicorn - one branch terminating development); branches mm wide, often twisted or spiral, apices pointed; holdfast small, fibrous, mat-like. Blades 180-360 /im thick, 10-25 medulla cells wide; medulla cells in 1 layer, rectangular, arranged in rows; surface cells in 1 layer, 30-40/xm diam., 3-5 transversing each medulla cell; surface filaments in tufts, more numerous at margins than central axis, soon deciduous. Fracture zone specimens: Seagrass bed of east fracture, 3 m deep on mangrove peat, 1993, D&M Littler 25097 (US). Seagrass bed of west fracture, 3 m deep on mangrove peat, , D&M Littler 25146 (US). Wall of central fracture, 4 m deep on mangrove peat, 1993, D&M Littler 25055 (US). Bottom of east fracture, 7 m deep on mangrove peat, , D&M Littler 25119 (US).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Press; National Research Council (U. S. ). Pacific Science Board; Smithsonian Institution; National Museum of Natural History (U. S. ); United States. Bureau of Sport Fisheries and Wildlife. Washington, D. C. : [Smithsonian Press]
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