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Sporad types observed in the Paphiopedilum interspecific F1 hybrids using a differential interference contrast microscope: (A) a normal tetrad is enclosed in a thick callose wall; (B) a dyad is enclosed in a thick callose wall; (C) a triad is enclosed in a thick callose wall; (D) an irregular tetrad with a micronucleus (arrow). Scale bars = 10 µm
