. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 1. Branch apex with dichotomously branched filaments. 2. Tetrasporic branch. 3. Prostrate filament. Herposiphonia secunda (C. Agardh) Ambronn 1880:197. Hutchinsia secunda C. Agardh 1824:149. Thallus prostrate, entangled, finely fibrous mats tightly adhering to substratum; of indeterminate size; red-brown when subtidal, yellow-brown when intertidal; prostrate branching irregularly alternate, apices upcurved; branchlets short, inconspicuous, unbranched; apex tufted; rhizoids single (seldom 2-3) celled, occasiona
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 1. Branch apex with dichotomously branched filaments. 2. Tetrasporic branch. 3. Prostrate filament. Herposiphonia secunda (C. Agardh) Ambronn 1880:197. Hutchinsia secunda C. Agardh 1824:149. Thallus prostrate, entangled, finely fibrous mats tightly adhering to substratum; of indeterminate size; red-brown when subtidal, yellow-brown when intertidal; prostrate branching irregularly alternate, apices upcurved; branchlets short, inconspicuous, unbranched; apex tufted; rhizoids single (seldom 2-3) celled, occasionally with finger-like, branched apices. Prostrate axes 75-150 ^im diam., of 7-9 pericentral cells, bearing single upright every 5-6 joints; erect branchlets 60-125 fxm diam., 1-2 mm tall, segments as long, 4-9 pericentral cells, unbranched; apical filaments deciduous, dichotomously branched; tetraspores uniseriate (straight series) near branch apex, to 75 /um diam.; pericarps near branchlet apex, solitary. Fracture zone specimen: Seagrass bed of central fracture, 3 m deep, epiphytic on larger algae or seagrass, 1993, D&M Littler 25038 (US). Wall of east fracture, 4 m deep on mangrove peat, , D&M Littler 25081 (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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