The ascocarps of Pseudoplea gaeummannii arise by the division of a small group of enlarged cells to form a globose parenchymatic stroma. In certain favored cells of this stroma the nuclei increase in number and size to give rise to an ascogenous system. No cell or nuclear fusion nor nuclear pairing was seen at this stage. Eventually, enlarged cells each with a single pair of nuclei appear in this ascogenous system. These cells give rise to the asci, and the paired nuclei within them fuse. These enlarging, active nuclei consist of a single large granule or "nucleolus". Stages of meiosis were rapid, difficult to find, and the details of chromatin behavior were difficult to follow.