thallus

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Definition of thallus in English English dictionary: Any plant body lacking vascular tissue; An undifferentiated plant body, such as in algae; {i} structure of cells in plant body (Botany); (pl = thalli) the `body' of a fungus; The vegetative body of the lower plant that has not differentiated into stems and leaves; A solid mass of cellular tissue, consisting of one or more layers, usually in the form of a flat stratum or expansion, but sometimes erect or pendulous, and elongated and branching, and forming the substance of the thallogens; The body of a seaweed; 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; an undifferentiated plant body, as in the thallophytes; a plant body without true stems or roots or leaves or vascular system; characteristic of the thallophytes; A type of plant body not differentiated into root, stem or leaf; The fourth continent of Khoras; vegetative body of a fungus
crustose thallus: thin crusty lichen thallus; adheres closely to or is embedded in the surface on which it grows

thallus

Hyphenation

thal·lus

[ 'tha-l&s ] (noun.) 1829. New Latin, from Greek thallos, from thallein to sprout; akin to Armenian dalar green, fresh, Albanian dal I come forth.

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