thallus


thallus
/thal"euhs/, n., pl. thalli /thal"uy/, thalluses. Bot., Mycol.
a simple vegetative body undifferentiated into true leaves, stem, and root, ranging from an aggregation of filaments to a complex plantlike form.
[1820-30; < NL < Gk thallós young shoot, twig]

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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.

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      plant body of algae, fungi, and other lower organisms formerly assigned to the obsolete group Thallophyta. A thallus is composed of filaments or plates of cells and ranges in size from a unicellular structure to a complex treelike form. It has a simple structure that lacks specialized tissues typical of higher plants, such as a stem, leaves, and conducting tissue.

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Universalium. 2010.

Look at other dictionaries:

  • THALLUS° — (Gr. θαλλος), a first century C.E. author (probably heathen) of a lost Greek universal chronicle in three books of which eight fragments survive. Thallus main theme was Hellenic rather than biblical history. Freudenthal suggested that Thallus was …   Encyclopedia of Judaism

  • Thallus — Thal lus, n.; pl. {Thalli}. [NL., fr. Gr. ? young shoot or branch, frond.] (Bot.) 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… …   The Collaborative International Dictionary of English

  • thallus — thallus. См. слоевище. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Thallus — (Th. Ach.), das Laub der Flechten, an der Erde, auf Steinen, Mauern, Felsen, Baumrinde od. Holz, in Gestalt einer gelappten blattartigen od. harten rindenartigen od. schorfartigen Masse, auf welcher sich schild , becherförmige etc. Behälter… …   Pierer's Universal-Lexikon

  • Thallus — (griech., Thallom, Laub, Lager), alle Pflanzenkörper, an denen diejenigen Gliederungen, Wachstumgesetze und Einrichtungen des innern Baues, welche die Merkmale vom Stengel, Wurzel und Blatt ausmachen, nicht wahrzunehmen sind, wie bei allen Pilzen …   Meyers Großes Konversations-Lexikon

  • Thallus — (grch.), Thallōm, Lager, Pflanzenkörper, der nicht in Wurzel, Stamm und Blatt gegliedert ist (Pilze, Flechten, Algen) …   Kleines Konversations-Lexikon

  • Thallus — Thallus, Pflanzenkörper der ⇒ Thallophyten, der aus Zellen, die durch gemeinsame Zellwände verbunden und arbeitsteilig spezialisiert sind, besteht und nicht die Merkmale eines typischen ⇒ Cormus besitzt. In der Stammesgeschichte ist es mehrfach… …   Deutsch wörterbuch der biologie

  • thallus — Latin, from Gk. thallos green shoot, twig, related to thalia abundance, thalos scion, child, ultimately from PIE root *dhal to bloom (Cf. O.Ir. duilesc, a type of algae) …   Etymology dictionary

  • thallus — [thal′əs] n. pl. thalli [thal′ī΄] or thalluses [ModL < Gr thallos, young shoot: see THALIA] the nonvascular plant body of a thallophyte, showing no clear distinction of roots, stem, or leaves thalloid [thal′oid΄] adj …   English World dictionary

  • Thallus — For the chronologer/historian occasionally mentioned in the works of early Christian writers, see Thallus (historian). Thallus, from Latinized Greek theta;α lambda; lambda; omicron; sigmaf; ( thallos ), meaning a green shoot or twig , is an… …   Wikipedia

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