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Thallus

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thallus

Plant body of algae, fungi (see fungus), and similar simple, plantlike organisms. Composed of filaments or plates of cells, a thallus ranges in size from a single-celled structure to a complex treelike form. The photosynthetic and supportive cells tend to be organized linearly, but a thallus lacks such differentiated specialized structures as stem, leaves, and conducting tissue. Most thallus plants are currently classified as complex protists.

thallus [′thal·əs]
(botany)
A plant body that is not differentiated into special tissue systems or organs and may vary from a single cell to a complex, branching multicellular structure.
Thallus 

the body of lower plants (algae, fungi, myxomycetes, lichens). A thallus is not differentiated into stem and leaves. Thalli are characteristic of thallophytes.
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Some taxa within the Kalana flora exhibit thallus architecture diagnostic of the Chlorophyte (green algae) order Dasycladales.
Thallophytic algal flora from a new Silurian Lagerstatte/ ... by Tinn, Oive; Meidla, Tonu; Ainsaar, Leho; Pani, Tonu / Estonian Journal of Earth Sciences
Irish moss is obtained from the dried thallus of Chondrus crisp us.
Irish Moss - Uses and Side Effects by Ricky Hussey / Health, general community
When the meristem is formed farther away from the apex, the thallus remains distinctly lopsided longer.
Gametophyte morphology and development of six Chinese species of ... by Zhang, K.M.; Shi, L.; Zhang, X.C.; Jiang, C.D.; Tim-Chun, W.L. / American Fern Journal
 
 
 
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