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The Journal of the Royal Institute of Thailand Volume IV - 2012 65  Rhizophora mucronata, Rhizophora apiculata, Avicennia alba, Avicennia marina, Bruquiera cylindrica, Bruquiera gymnorrhiza, Ceriops tagal, Excoecaria agallocha, Sonneratia alba, Sonneratia caseolaris, Xylocarpus granatum, Xylocarpus moluccensis, Lumnitzera racemosa, Lumnitzera littoraria, and Excoecaria agallocha. Two common species of palms, Nypa fruiticans and Phoenix paludosa, and two ferns, Acrosticum aureum and Acrostichum spiciosum are abundant in mangrove forests. Figure 8 illustrates some of the important tree species in mangroves. The epiphytes are widespread within the mangrove forest, the common species are Dendrobium crumenatum, Hoya parasitica, Paphiopidilum exua, Luisia zollingeri and Viseum ovalifolium . All these species can be found on stems, branches and roots of various mangrove tree species and dead trunks. Many genera of algae which are attached to the trunks and roots of mangrove trees are highly productive, particularly Rhizophora, Avicennia and Bruguiera. Some algae species are attached to stones, shells, dead leaves or debris in the mangrove forest. There are about 46 species of algae reported by Lewmanomont (1976), and the important species are Catenella, Bostrychia, Gracillaria, Hypnea, Caulerpa and Dictyota. Mangrove forests are also favourable habitats for phytoplanktons. There are more than 100 genera of phytoplankton communities in the mangrove (Paphavasit et al., 2009). The important species mainly belong to the genera of Oscillatoria, Palaria, Chaetoceros, Thalassionema, Anabaena, Thalasssiosira, Bacillaria and Nitzschia . Sanit Aksornkoae