. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 23. 1. Rhizome with unbranched rhizoids. 2. Branch apices with unilateral branchlets. 3. Branch with tetraspores. 4. Tetraspore on unicellular stalk. *Spermothamnion gymnocarpum Howe 1920:579. Thallus tufted, small, bushy, filamentous; to 3 cm tall; purple-pink; branching dichotomous below, soon becoming opposite, distally unilateral; rhizome conspicuous, filamentous; rhizoids unbranched, terminating in attachment pad. Main axis erect, filament cells 50-115 diam., 300-375 tim long, walls 5-40 /xm thick, di
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 23. 1. Rhizome with unbranched rhizoids. 2. Branch apices with unilateral branchlets. 3. Branch with tetraspores. 4. Tetraspore on unicellular stalk. *Spermothamnion gymnocarpum Howe 1920:579. Thallus tufted, small, bushy, filamentous; to 3 cm tall; purple-pink; branching dichotomous below, soon becoming opposite, distally unilateral; rhizome conspicuous, filamentous; rhizoids unbranched, terminating in attachment pad. Main axis erect, filament cells 50-115 diam., 300-375 tim long, walls 5-40 /xm thick, distally tapering to 12-20 tim diam.; rhizome cells 50-130 tim diam., 130-400 /xm long, walls 13-50 /xm thick, uncorticated throughout; tetrasporangia solitary or in groups of 2-5 near joint, 60-80 /xm diam., on unicellular stalk; spermatangial clusters oval to spherical, 26-40 /xm diam., 40-80 /xm long; cystocarp solitary or in small groups, hemispherical, 80-150 /xm diam. Fracture zone specimens: Seagrass bed of central fracture, 3 m deep, epiphytic on larger algae or Thalassia testudinum, , D&M Littler 25041 (US). Seagrass bed of west fracture, 3 m deep, epiphytic on larger algae or Thalassia testudinum, , D&M Littler 25149 (US). Bottom of east fracture, 7 m deep, epiphytic on larger algae or Thalassia testudinum, , D&M Littler 25126 (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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