Azolla filiculoides Lam.

Azolla (mosquito fern, duckweed fern, fairy moss, water fern).
Azolla_filiculoides_01_compr Azolla_filiculoides_02_compr

Description 1

Small perennial aquatic fern, floating (not deeply rooted) of up to 10 cm, with numerous simple roots of 6 cm and branched stems completely covered in leaves. Green in colour, turning crimson in autumn and winter. Intertwined bilobed leaves, made up of two lobes, the upper with numerous hairs with buds and with a wide hyaline margin. Megaspores with three floaters.

Biology 1

Thermophillic species that reproduces vegetatively by fragmentation. Scarce sexual reproduction, it can sporulate from July to September, forming prothallium from floating spores. It is symbiotically associated with the alga Anabaena azollae, which attaches to the back of the upper lobe of the leaves.

Habitat 1

Waters in ponds and dams, irrigation pools, canals, rice paddies, artificial ponds, ditches, natural streams in ravines Optimum temperature for growth of 20-22oC, perishing at under 7oC and above 42oC. The concentration of phosphorous dissolved in the water is a factor that controls its growth.

Sources 1

Spanish Catalogue of Exotic Invasive Species, Atlas of Exotic Invasive Plants in Spain, Project invasIBER

Spanish Catalogue of Exotic Invasive Species - Flora 1

http://www.magrama.gob.es/es/biodiversidad/temas/conservacion-de-especies/especies-exoticas-invasoras/ce_eei_flora.aspx

Fuentes y Créditos

  1. Adaptado por INVASORES - administrador de un trabajo de (c) cartotragsatec, algunos derechos reservados (CC BY), http://natusfera.gbif.es/guide_taxa/46

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