ClipArt ETC
"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells. Ca, nu, nucellus, a, archesporium; in, forward growth of tissue to form the integument; Cb, nu, nucellus; in, integument." -Stevens, 1916

Megaspore Formation Stage 3

"Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells.…

The anther and archesporium in the stages of "formation of anthers and pollen grains or microspores of Silphium." -Stevens, 1916

Microspore Anther

The anther and archesporium in the stages of "formation of anthers and pollen grains or microspores…

The archesporium in the stages of "formation of anthers and pollen grains or microspores of Silphium." -Stevens, 1916

Microspore Archesporium

The archesporium in the stages of "formation of anthers and pollen grains or microspores of Silphium."…