Sporogenesis in Reboulia hemisphaerica

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Abstract
An historical resume, material, and methods are given; the writer was unable to employ osmic acid fixation on Reboulia. Early investigators in the Hepaticae sought to establish a scheme of evolutionary advancement, basing their claim on slight apparent differences in the sporogenetic processes of the various genera. Most recent work does not sustain or advance this theory, and kinetic processes in Reboulia even displayed features more germane to those attending some forms of animal mitosis. Synapsis was not noted, but synizesis was marked in the pre-meiotic period. Chromosomes (n = 16) were not derived by the transection of a chromatin spireme, but directly from the nucleolus. They did not vary in character or contour in haploid and diploid phases. The kinoplasmic caps seen by so many workers in the Hepaticae were not found. No centrosomes appeared, but true asters always appeared at the poles of the achromatic figure. Quadripartition of the spore mother cell was centrifugal, following the formation of a phragmoplast and opposing cell plates. The heterotypic telophase nuclei reorganize into resting nuclei before the prophase of the homotypic mitoses.

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