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Published In: Encyclopédie Méthodique, Botanique 1(1): 343. 1783. (1 Dec 1783) (Encycl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 9/21/2011)
Acceptance : Accepted
Project data     (Last Modified On 8/19/2015)
Area distribution:

One genus and about 6 species in the New and the Old World. 



            In modern systematics, the genus Azolla (Azollaceae) is included in the Salviniaceae. We followed the conservative approach (J.J. Schneller un Kubitzki, 1990) and kept separate these two related families.


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Small floating ferns. Rhizome slender, creeping, short, branching into protostelic stems, bearing short, chlorophyllous and deciduous roots. Leaves all alike, 2 at each node, tiny, bilobed, imbricate, upper lobe papillate and inhabited by colonies of the blue-green algae Anabaena, lower lobe usually a-chlorophyllous. Sori (sporocarps) are formed in 2 or 4 on the lower lobes of the first leaf of each stem. The microspores are  joined together into several masses (massulae) in each sporangium by the hardened frothy mucilage. Each massula is covred with barbed hairs (glochidia) which enable the floating massulae to anchor to a floating male prothallus.


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