Talk about the conjugation type of sexual reproduction related to fertilization mode.

Conjugation (Cystogamy) is a process by which a donor cell (- mating type) makes a temporary contact with a recipient cell (+ mating type) through a conjugation tube (e.g. Spirogyra) or a protuberance (e.g. Mucor) to transfer and fuse its content and its genetic material directly from the donor into the recipient cell.