四面体

The tetrasporophyte wrapped by callose is of simultaneous type.

呈面型，被胼胝壁所包围。

Pollen mother cells undergo meioses through simultaneous cytokinesis and give rise to tetrads of microspores, which are tetrahedrally arranged.

花粉母细胞行减数，细胞属同时型，生小孢子，为面形。

Ubisch bodies and lipid bodies are found in the glandular tapetums. In meiosis of microsporocyte, cytokinesisis is a simultaneous type, which produces an isobilateral tetrad.

小孢子母细胞减数胞为同时型,生正面型。