usnea

Thân thiện

A pale green usnea hangs from a mossy tree branch in the forest.

Definition

Noun: 1. A genus of fruticose lichens, commonly known as beard lichens or old man's beard, characterized by a greyish or yellowish, pendulous (hanging down), and freely branched thallus (vegetative body). They are widely distributed, often found growing on tree branches in forests.

Usage Examples

• Noun:
  • The ancient oak was draped with long strands of usnea.
  • Scientists study usnea as a bioindicator of air quality.
  • The forest had a mystical quality, with usnea hanging from every branch.

Advanced Usage

• In Ecology: species are sensitive to air pollution, particularly sulfur dioxide, making them important indicators of environmental health. Their presence often signifies clean air.
• In Traditional Medicine: Historically, some species have been used in various folk medicine traditions for their purported antimicrobial properties.

Variants and Related Words

• Usneaceae (n): The botanical family to which the genus belongs.
• Usnic acid (n): A secondary compound produced by and some other lichens, studied for its biological activity.

Synonyms

• Beard lichen
• Old man's beard
• Tree's dandruff (informal)

Related Phrases & Terms

• Fruticose lichen: A growth form category for shrubby or hair-like lichens, which includes .
• Pendulous thallus: Describes the hanging, branched structure characteristic of .

Học thuật

Noun

1. widely distributed lichens usually having a greyish or yellow pendulous freely branched thallus

Từ đồng nghĩa

• Usnea
• genus Usnea