Definition of thallus in English:

thallus

nounPlural thalli ˈθaləsˈθæləs

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.
Example sentencesExamples
- Filaments are typically tightly twisted and bundled, but may become separated in the middle part of the thallus.
- The thallus and rhizoid can be distinguished by their different patterns of cell division.
- Some causal relationships between morphology and hydrodynamic performance have been established for macroalgae, through theoretical studies and hydrodynamic comparisons of differently exposed thalli.
- Oomycetes resemble fungi in the form of their thalli, ecology, and the plant parasitic ability of some species and are traditionally studied by mycologists.
- Ceratopteris spores, like fucoid zygotes, divide unequally to produce a small rhizoid cell and a larger cell that develops into the thallus.

Derivatives

thalloid

adjective

Botany

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.
Example sentencesExamples
- More complex thalloid compressions may display morphologies that are localized within a given phylum but convergent among phyla.
- When a spore germinates, it produces a flat thalloid plant with a greasy blue-green color and odd morphology.
- Furthermore, logs provide persistent, exposed substrate where thalloid gametophytes can escape smothering by deciduous hardwood leaf litter.
- Some of these plants are thalloid much like early liverworts, hornworts and mosses might have been.

Origin

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

Definition of thallus in US English:

thallus

nounˈTHaləsˈθæləs

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.
Example sentencesExamples
- Filaments are typically tightly twisted and bundled, but may become separated in the middle part of the thallus.
- Oomycetes resemble fungi in the form of their thalli, ecology, and the plant parasitic ability of some species and are traditionally studied by mycologists.
- Ceratopteris spores, like fucoid zygotes, divide unequally to produce a small rhizoid cell and a larger cell that develops into the thallus.
- The thallus and rhizoid can be distinguished by their different patterns of cell division.
- Some causal relationships between morphology and hydrodynamic performance have been established for macroalgae, through theoretical studies and hydrodynamic comparisons of differently exposed thalli.

Origin

Early 19th century: from Greek thallos ‘green shoot’, from thallein ‘to bloom’.

单词	thallus
释义	Definition of thallus in English: thallus nounPlural thalli ˈθaləsˈθæləs 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. Example sentencesExamples Filaments are typically tightly twisted and bundled, but may become separated in the middle part of the thallus. The thallus and rhizoid can be distinguished by their different patterns of cell division. Some causal relationships between morphology and hydrodynamic performance have been established for macroalgae, through theoretical studies and hydrodynamic comparisons of differently exposed thalli. Oomycetes resemble fungi in the form of their thalli, ecology, and the plant parasitic ability of some species and are traditionally studied by mycologists. Ceratopteris spores, like fucoid zygotes, divide unequally to produce a small rhizoid cell and a larger cell that develops into the thallus. Derivatives thalloid adjective Botany 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. Example sentencesExamples More complex thalloid compressions may display morphologies that are localized within a given phylum but convergent among phyla. When a spore germinates, it produces a flat thalloid plant with a greasy blue-green color and odd morphology. Furthermore, logs provide persistent, exposed substrate where thalloid gametophytes can escape smothering by deciduous hardwood leaf litter. Some of these plants are thalloid much like early liverworts, hornworts and mosses might have been. Origin Early 19th century: from Greek thallos 'green shoot', from thallein 'to bloom'. Definition of thallus in US English: thallus nounˈTHaləsˈθæləs 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. Example sentencesExamples Filaments are typically tightly twisted and bundled, but may become separated in the middle part of the thallus. Oomycetes resemble fungi in the form of their thalli, ecology, and the plant parasitic ability of some species and are traditionally studied by mycologists. Ceratopteris spores, like fucoid zygotes, divide unequally to produce a small rhizoid cell and a larger cell that develops into the thallus. The thallus and rhizoid can be distinguished by their different patterns of cell division. Some causal relationships between morphology and hydrodynamic performance have been established for macroalgae, through theoretical studies and hydrodynamic comparisons of differently exposed thalli. Origin Early 19th century: from Greek thallos ‘green shoot’, from thallein ‘to bloom’.
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