Page 133 - PG 101-Course notes مذكرة النظري 24-25 with spec

Medicinal plants (PG 101) Level 1 Clinical Pharmacy-PharmD

 The fungal hyphae fixes the lichen to the substrate, absorbs mineral salts and

protects the algal cells from desiccation and excessive light intensity.

 Lichens reproduce asexually by:

- Fragmentation of parts of the lichen.

- Formation of specialized structures called soredia which contain

parts of both components.

 Some important lichens:

Lichens belonging to Family Parmeliaceae,

examples are:

o Iceland moss: “Citraria islandica” It contains the carbohydrates

lichenin and isolichenin (lichen starch). Use: Demulcent and as

nutrient jelly.

o Litmus: Dried extract of Lacunaria tartarea. Use: As acid base
indicator, blue in the alkaline medium and the red in acid medium.

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