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Marine Algae of St Martin’s Island, Bangladesh. Xi. Red Algae (rhodophyceae)

Abdul Aziz
Department of Botany, University of Dhaka, Dhaka 1000, Bangladesh

Md. Towhidur Rahman
Department of Botany, University of Dhaka, Dhaka 1000, Bangladesh

Abstract/ Executive Summary:

Falkenbergia hillebrandii (Bornet) Falkenberg, Gelidiella tenera (J. Ag.) Schmitz, Halymenia floridana J. Ag., Liagora harveyiana Zeh and Polysiphonia harveyi Bailey of Rhodophyceae have been recorded and described for the first time from the St Martin’s Island, Cox’s Bazar, Bangladesh.

Keywords: Seaweeds, Rhodophyceae, St. Martin's Island, Bangladesh

Location: Department of Botany, University of Dhaka, Bangladesh

Start Date: 00-00-1986

End Date: 00-00-1995

Program Area: Conservation and Biodiversity

Commodity: Algae

Objectives:

To determine the Marine Algae of st Martin’s Island, Bangladesh. Xi. Red Algae (rhodophyceae)

Methodology:

Marine algae collected on 06 January 1986 by Professor Sayed Hadiuzzaman and Professor Abdul Aziz, Department of Botany, University of Dhaka on 01 March, 1995 from the St. Martin’s Island (20°34´28'' - 20°38´14" N and 92°18´51" - 92°20´25" E), Cox's Bazar, Bangladesh were considered. The materials were preserved in marine water with 4% formalin, some were made into herbaria and have been stored in the first author's algal herbarium, Department of Botany, University of Dhaka. Liagora harveyiana Zeh.

Source of Information: Bangladesh J. Bot. 39(2): 161-168, 2010 (December)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Liagora harveyiana Zeh, Habit: Plants very bushy, dichotomously branched, calcified. Vegetative structure: Thalli strongly calcified, becoming rigid, usually 3 - 7 cm high with one to several main branches arising from a discoid holdfast, dichotomously branched after every 2 - 4 (-8) mm distance, forming a very dense rounded tuft; lower part of the thallus about 1 mm thick, branches narrowing gradually to about 0.5 mm below apices. Color pinkish-red with whitish crust (especially on lower parts). Basal cells of assimilatory filament cylindrical, 50.8 - 63.5 µm long and 10.00 - 11.50 µm broad; cells next to the basal cell cylindrical to slightly inflated in the middle, while distal cells are more inflated appearing ellipsoidal to balloon-like highly granulated; assimilatory cells with one pyrenoid in each; branching of as similatory filaments dichotomous proximally but trichotomous distally giving as bushy appearance. Terminal cells up to 10.16 µm long, 6.35 µm broad and may develop short or long flask shaped structure. Some tip cells cut off very small spherical structures appearing spermatangia. Gelidiella tenera (J. Ag.) Schmitz, Habit: Thalli dichotomously branched, erect. Vegetative structure: Plants erect, up to 10 cm tall, cartilaginous; the base producing short thick haptera-like attachment organ. Stipe broadly rounded in cross section, dichotomously branched distally. Branches elliptical in cross section basally but as they grow upwardly, flanges develop on both sides with midrib which diminishes near the apex, apices gradually narrowed into a filiform tip. Halymenia floridana J. Ag. Synonym: Halymenia bermudensis F. S. Collin & M. A. Howe H. gelinaria F. S. Collin & M. A. Howe Habit: Plants of moderate to considerable size, foliaceous, generally of a gelatinous consistency. Falkenbergia hillebrandii (Bornet) Falkenberg , Habitat and local distribution: The alga grows on Liagora harveyiana Zeh; which was found to be growing on boulders; collection no. 255, 01 March, 1995; common. Polysiphonia harveyi Bailey, Habit: Plants erect, usually laterally branched. Habitat and local distribution: Plants were collected from the base of Liagora harveyiana Zeh which was found on the west coast of St Martin’s Island; collection no. 252, 06 Jan. 1986; common.

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