Some problems of modern systematics of fungi are discussed and major macrosystems are analysed. Special attention is devoted to the recent edition of system developed by T.Cavalier-Smith (1998). This system contains some essential merits and some demerits. Moratorium on publishing of fungal macrosystems until 2050 is proposed. The nature of ancestral fungi is discussed. The collar flagellates (Choanoflagellatea) are the most likely extant protist group ancestral to both animals and fungi.
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