Further observations in embryo sac development in Alchemilla L. [subsection Heliodrosium Rothm.]

Origin of embryo sacs was examined in further two Alchemilla species: A. acutiloba and A. montícola. The central region of multicellular archesporium shows meiotic tendencies but as a rule, the meiotic division did not advance further than up to I ptophase. Apomeiotic embryo sacs arise from unreduced cells, either from megaspore mother cells (diplospory) or from cells of somatic character (apospory). In the same ovule a few embryo sacs of both types may be formed. Usually only one of them reaches a distinct prevalence and the full maturity.