. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. tim 1. Filament apex. 2. Cross section of filament showing 4 pericentral cells surrounding central filament. Pofysiphonia scopulorum var. villum (J. Agardh) Hollenberg 1968:81, fig. 7a. Pofysiphonia villum J. Agardh 1863 [1851-1863]: 941. Thallus filamentous, fine, tufted; to 3 cm tall; light brown-red; main branching alternate; attached by numerous unicellular rhizoids descending from prostrate branches. Main branches 40-80 jam diam.; secondary branches slightly thinner, of 4 pericentral cells, uncorticated;
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. tim 1. Filament apex. 2. Cross section of filament showing 4 pericentral cells surrounding central filament. Pofysiphonia scopulorum var. villum (J. Agardh) Hollenberg 1968:81, fig. 7a. Pofysiphonia villum J. Agardh 1863 [1851-1863]: 941. Thallus filamentous, fine, tufted; to 3 cm tall; light brown-red; main branching alternate; attached by numerous unicellular rhizoids descending from prostrate branches. Main branches 40-80 jam diam.; secondary branches slightly thinner, of 4 pericentral cells, uncorticated; filament scar cells generally lacking; segments to 2 diameters long; apical filaments deciduous, alternate on every 2-6 segments; prostrate runner 60-100/am diam.; rhizoids from center of pericentral cell, in open connection; tetrasporangia spherical, 50-60 /xm diam., in swollen straight series just below branch apices, in straight series; spermatangial branchlets forming from filaments, cylindrical; cystocarps oval, 150-190/xm diam. Fracture zone specimens: Seagrass bed of central fracture, 3 m deep, epiphytic on seagrass, , D&M Littler 25044 (US). Seagrass bed of west fracture, 3 m deep, epiphytic on seagrass, , D&M Littler 25155 (US).. 100 iim 1. Apex. 2. Tetrasporangia spirally arranged on surface filament. 3. Main axis with numerous spines, lateral, alternately branched, surface filaments. 4. Cross section - main axis. Wrightiella blodgettii (Harvey) Schmitz 1893:221. Alsidium blodgettii Harvey 1853:16, pi. XV, B. Thallus erect, stiff, spiny; to 20 cm tall; bright red to pink; primary branching proximal, irregular; spines numerous above, absent below, 1-5 mm long, spur-like, solitary or in pairs, occasionally forked, tapered at apex; surface filaments sparse; holdfast small, inconspicuous, disc-like or tap-root-like in soft sediment. Branches mm diam., 4-5 pericentral cells, partially or completely corticated, with numerous short spines
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