. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 79 LdUrencia ObtUSa (Hudson) Lamouroux Thallus: compact, often clumped, 8-1 5(-26) cm high, dark to olive- green with maroon tips; branching alternate, sparse below, numerous and crowded above. Branches cylindrical, proximally mm diam. Branchlets generally spiral to occasionally opposite, mm diam., 1-2 mm long; apices tufted with ne deciduous laments forming in shallow terminal depression. Surface cells 24-30 Mm diam., somewhat spherical, heavily pigmented, with distinctive colorless spher
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 79 LdUrencia ObtUSa (Hudson) Lamouroux Thallus: compact, often clumped, 8-1 5(-26) cm high, dark to olive- green with maroon tips; branching alternate, sparse below, numerous and crowded above. Branches cylindrical, proximally mm diam. Branchlets generally spiral to occasionally opposite, mm diam., 1-2 mm long; apices tufted with ne deciduous laments forming in shallow terminal depression. Surface cells 24-30 Mm diam., somewhat spherical, heavily pigmented, with distinctive colorless spherical bodies ("corps en cerise") present in live or recently preserved specimens only; medullary cells large, colorless; apical cell sunken in shallow terminal depression. Tetrasporangia tetrahedrally divided. Common: in shallow wave- dashed habitats or areas of strong currents; to 8 m deep. Highborne Cay distribution: extremely common on the reef crest and reef at in shallow water near low tide mark, found only once in the stromatolite 200 (im 100 jim 100 /im 1. Typical branch. 2. Longitudinal section of cortex. 3. Surface view showing surface cells with distinctive microscopic spots. 4. Transverse section of branch cortex. 5. Cystocarp releasing carpospores. Phylum Rhodophyta Class Florideophyceae Order Ceramiales Family Rhodomelaceae Lophosiphonia obscura Thallus: as filamentous turfs, to (-2) cm high, of indeterminate area, red- brown; prostrate branching irregular; branching of erect laments infrequent, lateral. Prostrate axis to 140 urn diam., bearing single upright every (4-)8-l 0 or more joints; apices upcurved. Erect branchlets to 1 00 urn diam., tapering at apices; mature segments slightly longer than wide; pericentral cells (6-)9- 1 3, thick- walled; apices downturned. Apical laments crested on outer margin, slightly alternately o set on every segment when mature, soon deciduous, pseudodichotomously branched; basal cell often spherical. Rhizoids si
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