New record of Lobophora rosacea (Dictyotales, Phaeophyceae) from Bach Long Vi Isd. Hai Phong province, Vietnam.

Abstract

Lobophora rosacea is newly reported from Bach Long Vi Island, Hai Phong province, Vietnam.Our specimens are very similar to L. rosacea recently described from New Caledonia and HainanIsland, China, not only in morphology but also in rbcL gene sequences. The plant growsclustered and attached to the substrate by a basal holdfast. Thallus has fan-shaped to circular, up to 10 cm wide and 7 cm tall, 117–123 μm thick, lax, predominantly erect, light orange. Thalli are attached to the substratum by basal rhizoids on the ventral surface. Thallus margin entire andcomposed of single cell layered medulla, 14.88 μm (11.28 - 19.16 μm) wide, 35.34 μm (31.49 - 38.74 μm) high, 82.39 μm (75.76 - 88.72 μm) long; three cell layered cortex on the dorsal, 9.85 μm (5.96 - 14.92 μm) wide, 8.03 μm (5.99 - 10.00 μm) high and ventral side respectively, 12.20μm (8.79 - 15.14 μm) wide, 9.52 μm (8.10 - 12.14 μm) high. Reproductive structures areundetected.