Jan 1, 1975 · For ecological studies in the field (relev~s, etc.), the circumscriptions "L. gibba (flat) / L. minor" and "L. gibba (gibbous)" seem to be the only permissible ones. The flat forms, including L. minor, have other ecological ranges and belong to vegetation types of a different floristic composition, so that their separate treatment in ...

It has been concluded that flat Lemna vegetations in The Netherlands consist either of pure L. minor (mostly above sand), a mixture of L. minor and (temporarily) flat L. gibba, or exceptionally, (temporarily) flat L. gibba only.

Jan 1, 1975 · Gibbous forms with ventricose, swollen lower sides and large air chambers are unequivocally L. gibba, flat forms without recognizable air chambers on the lower side and with only three nerves belong to L. minor.

Lemna gibba, found as floating individuals rather than matted, is easily recognized under the microscope. The fronds are strikingly inflated on the lower surface, very unlike the relatively flat profile of other Lemnaceae here.

Thallus free-floating, surface broadly ovate, yellow-green, asymmetrical, slightly convex, 3–5(–6) mm. long, 2–4(–5) mm. wide, almost hemispherical below and spongy with large inflated hyaline cells and airspaces (even in flat form with large cells evident).

gibba - broadest near oblique asymmetric bluntly rounded apex, opaque, lacunae usually obvious, fronds sometimes reddening above and swelling below. Small plants often formed –more opaque / thicker than minuta and greener. Not globose like Wolffia turionifera like small gibba, flat, rather rounded, becoming dirty red-brown but never swelling ...

Jan 1, 1975 · Literature on Lemna gibba L. is reviewed with regard to physiological and morphological aspects of gibbosity. In addition, results of recent unpublished studies on the experimental control of gibbosity in vitro and the anatomy of the air chamber partition walls are in- …

Literature on Lemna gibba L. is reviewed with regard to physiological and morphological aspects of gibbosity. In addition, results of recent unpublished studies on the experimental control of gibbosity in vitro and the anatomy of the air chamber partition walls are included.

In the gibbous fronds the cells of the developing air chamber walls and peripheral walls were in a more active stage of division than in the flat fronds. Consequently, it was demonstrated that gibbosity is initiated in a young developing frond mainly as a result of enhanced cell division and the subsequent increase in the number of cells.

Lemna gibba (Fat Duckweed) is a species of perennial herb in the family Araceae. They are associated with freshwater habitat. They are native to Santa Catarina, The Contiguous United States, Paraná, Pampa, and Rio Grande Do Sul.