Which is a lichen thallus in Parmeliaceae, with usnic acid and polysaccharides, and has antimicrobial and anti-inflammatory actions?

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Multiple Choice

Which is a lichen thallus in Parmeliaceae, with usnic acid and polysaccharides, and has antimicrobial and anti-inflammatory actions?

Usnea barbata is a lichen thallus belonging to the Parmeliaceae family, commonly known as old man’s beard. Lichens produce distinctive secondary metabolites, with usnic acid being a hallmark compound in many Parmeliaceae species. The thallus also contains polysaccharides, contributing to the overall bioactivity. The combination of being a lichen thallus in Parmeliaceae, containing usnic acid and polysaccharides, and having antimicrobial and anti-inflammatory actions points to Usnea barbata. The other options are plants or different growth forms: Tanacetum vulgare and Salvia officinalis are medicinal herbs with antimicrobial and anti-inflammatory properties but are not lichens; Selenicereus grandiflorus is a cactus.

Usnea barbata is a lichen thallus belonging to the Parmeliaceae family, commonly known as old man’s beard. Lichens produce distinctive secondary metabolites, with usnic acid being a hallmark compound in many Parmeliaceae species. The thallus also contains polysaccharides, contributing to the overall bioactivity. The combination of being a lichen thallus in Parmeliaceae, containing usnic acid and polysaccharides, and having antimicrobial and anti-inflammatory actions points to Usnea barbata. The other options are plants or different growth forms: Tanacetum vulgare and Salvia officinalis are medicinal herbs with antimicrobial and anti-inflammatory properties but are not lichens; Selenicereus grandiflorus is a cactus.

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