. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 82 Dictyota cervicornis Kutzing 1859 11, pi. 24 Thallus: bushy, to 20 cm high, olive- brown; branching dichotomously asymmetrical, cervicorn. Branches mm wide (very old thalli with proliferating blades to 3 mm wide); 180-220 urn thick, 10-25 medullary cells wide, often twisted or spiral, small surface hooks often present in Indian River Lagoon specimens; apices pointed. Medullary cells in one layer, rectangular, 140-180 urn thick, arranged in longitudinal rows. Surface cells rectangular, 1 5-20 um thic
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 82 Dictyota cervicornis Kutzing 1859 11, pi. 24 Thallus: bushy, to 20 cm high, olive- brown; branching dichotomously asymmetrical, cervicorn. Branches mm wide (very old thalli with proliferating blades to 3 mm wide); 180-220 urn thick, 10-25 medullary cells wide, often twisted or spiral, small surface hooks often present in Indian River Lagoon specimens; apices pointed. Medullary cells in one layer, rectangular, 140-180 urn thick, arranged in longitudinal rows. Surface cells rectangular, 1 5-20 um thick. Surface hairs in tufts, scattered near central axis. Holdfast brous, mat- like; marginal rhizoids common. Sporangia scattered, solitary, to 1 20 um dian., surrounded by paraphyses. Oogonial sori scattered. Common: attached to rocks, shell fragments or large plants in sandy shallow areas; to 3 m deep. Highborne Cay distributin: common on the reef crest and reef at, occasionally in the stromatolite zone. g. 2. 100/im Phylum Heterokontophyta Class Phaeophyceae Order Dictyotales Family Dlctyotaceae Habit of blade. Surface view of antheridial sorus (s) surrounded by paraphyses (a). Transverse section of blade margin showing antheridial sori (s) and mar- ginal rhizoids (r). Pad'mCI haitiensiS Thivy in Taylor 1 960: 235, 632, pi. 75, Thallus: in leaf- like clusters, ru ed, to 6 cm high, upper surface chalky white alternating with light yellow- brown bands, lower surface less calci ed with darker brown bands. Blades fan- shaped, to 8 cm broad, concentrically zoned, substantially calci ed; to 65 um thick distally, 105 um thick proximally, generally of two cell layers, three cell layers only where surface hairs are produced or reproductive structures are formed; dorsal cells rectangular, 30-80 um wide, to 60 um thick; ventral cells smaller, rectangular, 20-60(-80) um wide, to 30 um thick; margins inrolled. Surface hairs to 15 um diam., 130 um long, in concentric zones. Rhizoidal
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