. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 1. Axial branch with tetrasporangial stichidium. 2. Axial branch with cystocarp. Murrayella periclados (C. Agardh) Schmitz 1893:227. Hutchinsia periclados C. Agardh 1828:101. Thallus dense, erect, turf-like; to 5 cm tall; dull, dark red-brown; branching dichotomous below, alternate above; branchlets deciduous, fine, slightly upcurved, unbranched or branched oppositely alternate; rhizome slender, creeping; rhizoids fine, filamentous. Branches of 4 pericentral cells, uncorticated; branchlets initially at each jo
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 1. Axial branch with tetrasporangial stichidium. 2. Axial branch with cystocarp. Murrayella periclados (C. Agardh) Schmitz 1893:227. Hutchinsia periclados C. Agardh 1828:101. Thallus dense, erect, turf-like; to 5 cm tall; dull, dark red-brown; branching dichotomous below, alternate above; branchlets deciduous, fine, slightly upcurved, unbranched or branched oppositely alternate; rhizome slender, creeping; rhizoids fine, filamentous. Branches of 4 pericentral cells, uncorticated; branchlets initially at each joint, monosiphonous; branchlet cells 28 /am diam, 60 tim long; tetrasporangial stichidia to 105 iim diam., 900/un long, terminal on short polysiphonous branch, unbranched or possessing monosiphonous branchlets; tetrasporangia 4 per whorl, to 55 tim diam.; cystocarps spherical to oval, to 400 fim diam., terminal on short polysiphonous branch. Fracture zone specimen: Seagrass bed of central fracture, 3 m deep on mangrove peat, , D&M Littler 25035 (US).. 100 fim 1. Filament branch. 2. Filament apex. 3. Prostrate filament - note rhizoid separated by cell wall. Pofysiphoniaferulacea Suhr in J. Agardh 1863 [1851-1863]: 980. Thallus filamentous, fine, tufted, bushy; to 6(-15) cm tall; light brown to purple-red; main branching alternate; initially attached by small disc, later by numerous unicellular rhizoids. Main branches 80-100(-300) /xm diam.; secondary branches slightly thinner, often basally constricted, of 4 pericentral cells, uncorticated, filament scar cells common; segments one diameter long or less; apical filaments highly branched, eventually deciduous, abundant, on every 4th-6th segment, immature often sickle-shaped; rhizoids separated by cell wall, distal on pericentral cells; tetrasporangia spherical, 50-60 tim diam., in swollen spiral series on outer branchlets; spermatangial branchlets lateral on lower segment of apical filaments, cylindrical, 60 ttm diam.
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