. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 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
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 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 single- celled, 30-50 urn diam., as extension of pericentral cell, partitioning cell wall absent, terminating in nger- like attachment pad. Uncommon: inconspicuous, on hard surfaces, in calm protected areas; lower intertidal to 2 m deep. Highborne Cay distribution: only recorded from the thrombolite zone adjacent to the beach in very shallow water. (C. Agardh) Falkenberg in Schmitz & Falkenberg 1 897: 46. 100 jim Downturned apex with apical laments slightly o set alternately at every segment. Downturned apex showing dichoto- mously branching laments. Transverse section of erect lament. Apex of prostrate lament. Phylum Rhodophyta Class Florideophyceae Order Ceramiales Family Rhodomelaceae. 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 C
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