Abstract
THE late Hans Kniep from 1915 onwards and Mlle. Bensaude in 1918 described the union of two mycelia of + and strains as a necessary preliminary to the formation of the sporophore in heterothallic species of Hymenomycetes. In such cases, plasmogamy is usually separated from karyogamy in the basidium by several successive divisions of conjugate nuclei through clamp connexions. This is held as indicating a ” degeneration of the sexual process”, and as the principal point of distinction from the type of sexual fusion known in green plants, where there is simultaneous fusion of protoplasm and nuclei of two conjugating gametes. But a closer reflection would lessen this difference.
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