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Pneumatophores of mangrove plant Pneumatophores differentiate the black mangrove and grey mangrove from other mangrove species. Fishers in some areas of Southeast Asia make corks for fishing nets by shaping the pneumatophores of mangrove apples ( Sonneratia caseolaris ) into small floats.
They function to help the colonies maintain their orientation in water. [6] In the Cystonectae subgroup, the pneumatophores have an additional function of assisting with flotation of the organisms. [6] The siphonophores exhibiting the feature develop the structure in early larval development via invaginations of the flattened planula structure. [6]
Aerating roots (or knee root or knee or pneumatophores): roots rising above the ground, especially above water such as in some mangrove genera (Avicennia, Sonneratia). In some plants like Avicennia the erect roots have a large number of breathing pores for exchange of gases.
Lumnitzera racemosa is a small to medium-sized evergreen tree, growing to a maximum height of 37 m (121 ft). It develops pneumatophores and often has stilt roots.The leaves are arranged spirally at the tips of the shoots; they are simple and obovate, with slightly toothed margins.
The inner tissue of respiratory roots is full of hollow, airy, tube-like dead cells, giving it a spongy texture. The outer surface of pneumatophores contains tiny pores or openings, which are called pneumathodes: e.g., Heritiera fomes, Rhizophora mucronata. Pneumatophores can be unbranched or sparingly branched.
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The red mangrove grows closest to open water. It has multiple prop roots, which may help to stabilize the soil around its roots. Further inland is the black mangrove lacking prop roots, but does have pneumatophores, which grow up from the roots to above the water level. The white mangrove grows further inland.