. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 26 200 Mm. 100 Mm 1. Branchlet with ultimate filamentous apices. 2. Cross section of branchlet. 3. Cross section of main axis. 4. Habit of plant. *Heterosiphonia gibbesii (Harvey) Falkenberg 1901:653. Dasya gibbesii Harvey 1853:59, pi. XV, A. Thallus soft, fluffy; to 20 cm tall; bright pink-red; lower branching sparse, alternate; branchlets absent near base, dense above, dichotomously divided, apices delicate, minute; holdfast small, disc-like. Main axis to mm diam., of 6-9 or more pericentral cells; corti
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 26 200 Mm. 100 Mm 1. Branchlet with ultimate filamentous apices. 2. Cross section of branchlet. 3. Cross section of main axis. 4. Habit of plant. *Heterosiphonia gibbesii (Harvey) Falkenberg 1901:653. Dasya gibbesii Harvey 1853:59, pi. XV, A. Thallus soft, fluffy; to 20 cm tall; bright pink-red; lower branching sparse, alternate; branchlets absent near base, dense above, dichotomously divided, apices delicate, minute; holdfast small, disc-like. Main axis to mm diam., of 6-9 or more pericentral cells; corticated on older axes; branchlets tapering, of 6 pericentral cells, uncorticated; ultimate branchlets single filaments, to 30 /xm diam.; tetrasporangial stichidia lance shaped, replacing lower branchlets; spermatangial stichidia similar, pointed; carpogonium near base of branchlets. Fracture zone specimens: Seagrass bed of east fracture, 3 m deep on mangrove peat, , D&MLittler 25101 (US). Seagrass bed of central fracture, 3 m deep on mangrove peat, , D&M Littler 25023 (US). Seagrass bed of west fracture, 3 m deep on mangrove peat, , D&M Littler 25144 (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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