STUDIES ON ECOLOGICAL ANATOMY OF THE MANGROVE FERN ACROSTICHUM AUREUM L.
Soniya Marsi Lobo and Krishnakumar G*
|Corresponding Author: Krishnakumar G, E-mail: [email protected]|
|Related article at Pubmed, Scholar Google|
Acrostichum aureum L. is the only fern in the mangrove ecosystem of the Indian Coast. Anatomical adaptations of the fern in relation to its habitat has been studied. Epidermal cells on both surfaces of pinnae are sinuous walled with thick cuticle. Adaxial epidermal cells exhibited a greater density than abaxial surfaces. Stomata are anomocytic and hypostomatic, mesophyll with two layers of elongated closely set palisade cells followed by loosely-arranged spongy cells with plentiful lacunae. Leaf margin has lignified cells. Endodermis of the vascular bundles have casparian strips; sclerenchymatous bundle sheath is also present. Outer root cortex is aerenchymatous and inner cortex is sclerenchymatous. Rhizome sections revealed presence of starch granules. Sporophyll shows sporangia spread densely over the entire lower surface except over midrib, forming a reddish brown mat and are mixed with many peltate orange brown paraphyses. Anatomical results were analyzed considering the interaction of this fern with abiotic factors. The plant has hydrophytic and xerophytic anatomical adaptations.