antheridium

1. (botany, mycology) An organ producing male gametes called antherozoids, found in some algae, ferns, and bryophytes.Examples: "Ascodesmis is a third type which might be derived either directly or through the erysiphaceous type from an endomycetous ancestor; the antheridium and oogonium are but little differentiated, but the latter is furnished with a trichogyne and becomes septate after fertilization; the ascogenous hyphae are few and the sheath simple."