The Haplontic Life Cycle
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In a haplontic life cycle, the multicellular organism is haploid throughout its life, and the only diploid cell is the zygote, which undergoes meiosis after forming.
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Most fungi and some algae spend nearly their entire life cycle as haploid organisms produced by mitosis.
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The zygote in this cycle divides by meiosis, not mitosis, so diploidy never persists past a single cell.