Soredia (s. soredium) are asexual reproductive structures characterized by containing both the photobiont and the mycobiont, and having no cortex. Often, they appear as a powdery or granular covering on the lichen thallus. (See also soralia.)
Soredia (s. soredium) are asexual reproductive structures characterized by containing both the photobiont and the mycobiont, and having no cortex. Often, they appear as a powdery or granular covering on the lichen thallus. (See also soralia.)