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(subdivision Ascomycotina)

An order of fungi which includes crustose lichens and saprotrophic and lichenicolous fungi. apothecia are sessile or immersed; they may have open discs or may be closed and perithecium-like. Asci are thick-walled; the spores are large. Species are found on various types of substrate, but rarely on limestone.

Subjects: Plant Sciences and Forestry.

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