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plural asci
(mycology) A sac-shaped cell present in ascomycete fungi; it is a reproductive cell in which meiosis and an additional cell division produce eight spores. quotations
The one important character which distinguishes the Ascomycetes from all other fungi is the ascus (plural, asci). This is a sac-like structure in which ascospores are formed following karyogamy and meiosis.
1967, Constantine. J. Alexopoulos, Harold C. Bold, Algae and Fungi, page 101