Greek aggeion - vessel, pteris - wing, referring to the shape of the indusium.

Large, erect and sometimes tree-like terrestrial ferns. Fronds of one kind, mostly long and arching, mostly twice-divided and up to 5 m or more long. Stalks usually with a swollen articulation at the point of attachment to segments. Sporangia round, near the segment margin, in 2 rows of 4-6 pairs side by side, separate but often touching.

c. 100-150 species tropical and subtropical rainforest (1 species in Australia).

Spores.

Extremely large fronds with sporangia in clusters that are not fused together; cf. Marattia.

Source: Spencer, R. (1995). Marattiaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 1, Ferns, conifers & their allies. The identification of garden and cultivated plants. University of New South Wales Press.