. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 50 ^m 1. Main axis with radial branchlets. 2. Cross section. 3. Branchlet apex. 4. Axis with branch showing corticating cell arrangement. Spyridia hypnoides (Bory) Papenfuss 1968: 281. Thamnophora hypnoides Bory de Saint-Vincent 1834:175. Thallus fuzzy, filamentous, densely bushy; to 25 cm tall; rose-red; branching alternate in all directions; branch apices often hooked; branchlets numerous, delicate, deciduous, banded, radially arranged; holdfast small, inconspicuous. Main axis 1-2 mm diam., central cells lar
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 50 ^m 1. Main axis with radial branchlets. 2. Cross section. 3. Branchlet apex. 4. Axis with branch showing corticating cell arrangement. Spyridia hypnoides (Bory) Papenfuss 1968: 281. Thamnophora hypnoides Bory de Saint-Vincent 1834:175. Thallus fuzzy, filamentous, densely bushy; to 25 cm tall; rose-red; branching alternate in all directions; branch apices often hooked; branchlets numerous, delicate, deciduous, banded, radially arranged; holdfast small, inconspicuous. Main axis 1-2 mm diam., central cells large, in single chain; surface cells small, initially alternating between long narrow cells and short wide cells, eventually in several layers; branchlets 30-50 jum diam., mm long; branchlet segment 40-100/xm long, uncorticated; branchlet joints corticated, cells initially elongated, eventually splitting transversely to form smaller cells; apex pointed, occasionally with recurved spine; sporangia spherical, sessile, 50-85 jum diam., at joints, solitary or 2-5 in clusters; spermatangia expanding from joints; carposporophytes terminal on short branches surrounded by incurved filaments. Fracture zone specimen: Wall of west fracture, 4 m deep on mangrove peat, , D&M Littler 25174 (US). Dasyaceae, Ceramiales ffi. 100 Mm 0& rwm. 1. Spermatangial stichidium. 2. Tetrasporangial stichidium. 3. Cross section of branch. 4. Main axis with lateral branchlets. 5. Habit of plant. *Dasya baiUouviana (Gmelin) Montagne 1841 [1839-1842]: 165. Fucus baillouviana Gmelin 1768:165. Thallus erect or undulating, delicate, fluffy, soft; to 90 cm tall; bright-red to rose; branching alternate, generally sparse; branches slippery, slimy, long, graceful, densely covered by fine branchlets, base often denuded; holdfast small, inconspicuous, disc-like. Main branches 2-3(-6) mm diam., corticated; branchlets filamentous, 2-7(- 14) mm long, 3 times dichotomous, basal cells 10-40/ttm diam.
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