Definition of thallus in English:

thallus

Syllabification: thal·lus
Pronunciation: /ˈTHaləs
 
/

noun (plural thalli /ˈTHalī/)

Botany
  • A plant body that is not differentiated into stem and leaves and lacks true roots and a vascular system. Thalli are typical of algae, fungi, lichens, and some liverworts.
    More example sentences
    • Oomycetes resemble fungi in the form of their thalli, ecology, and the plant parasitic ability of some species and are traditionally studied by mycologists.
    • Some causal relationships between morphology and hydrodynamic performance have been established for macroalgae, through theoretical studies and hydrodynamic comparisons of differently exposed thalli.
    • Ceratopteris spores, like fucoid zygotes, divide unequally to produce a small rhizoid cell and a larger cell that develops into the thallus.

Derivatives

thalloid

Pronunciation: /ˈTHaloid/
adjective
More example sentences
  • Furthermore, logs provide persistent, exposed substrate where thalloid gametophytes can escape smothering by deciduous hardwood leaf litter.
  • Ultrastructural research has revealed that the placental organization is remarkably diverse between major bryophyte groups but that, with the exception of simple thalloid liverworts, it shows only minor intra-group variation.
  • When a spore germinates, it produces a flat thalloid plant with a greasy blue-green color and odd morphology.

Origin

early 19th century: from Greek thallos 'green shoot', from thallein 'to bloom'.

More definitions of thallus

Definition of thallus in:

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day astrogation
Pronunciation: ˌastrəˈgāSHən
noun
(in science fiction) navigation in outer space