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Thallophytes ( Thallophyta or Thallobionta) are a polyphyletic group of non-motile traditionally described as "thalloid plants", "relatively simple plants" or "lower plants". They form a phylum of kingdom that include and algae and occasionally , bacteria and . Thallophytes have a hidden reproductive system and hence they are also incorporated into the similar category (together with ), as opposed to Phanerogamae. Thallophytes are defined by having undifferentiated bodies (thallus, pseudotissue), as opposed to (Cormophyta) with roots and stems. Various groups of thallophytes are major contributors to marine ecosystems.
Thallophytes (Thallophyta or Thallobionta) are a polyphyletic group of non-mobile organisms traditionally described as "thalloid plants", "relatively simple plants" or "lower plants". Stephan Endlicher, a 19th-century botanist, separated the vegetable kingdom into the thallophytes (algae, lichens, fungi) and the cormophytes (including and thus being equivalent to Embryophyta in this case) in 1836. Lindley (1846), page 46 This definition of Thallophyta is approximately equivalent to Protophyta, which has always been a loosely defined group.
In the Lindley system (1830–1839), Endlicher's cormophytes were divided into the thallogens (including the bryophytes), and cormogens ("non-flowering" plants with roots), as well as the six other classes. Cormogens were a much smaller group than Endlicher's cormophytes, Lindley (1846), page 49 including just the ferns (and Equisetopsida) and the plants now known as lycopodiophytes.
Thallophyta is a division of the plant kingdom including primitive forms of plant life showing a simple plant body. Including unicellular to large algae, fungus, .Abercrombie, M., Hichman, C.J. and Johnson, M.L. 1966. A Dictionary of Biology. Penguin Books.
The first ten phyla are referred to as thallophytes. They are simple plants without roots stems or leaves.Robbins, W.W., Weier, T.E. and Stocking, C.R. 1959. Botany an Introduction to Plant Science. Chapman & Hall, Limited, Limited
They are non-embryophyta. These plants grow mainly in water.
The term Euthallophyta was originally used by Adolf Engler.
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