About those that do come from such contexts, Mettinger's caution is relevant: "We have to seriously consider the possibility that these were regarded as postament
animals for the deity, who was understood as invisible, standing on the backs of the animals" (p.
The central zone forms the hypostase and other proximal nucellar structures, such as the postament and Zuleitungsbahn (conducting passage: see below).
Proximal nucellar structures include the hypostase, postament, podium, and perisperm.
In several Asparagales there are records of so-called chalazal haustoria, where the developing endosperm invades the lateral parts of the proximal nucellus, breaking down the lateral tissue and leaving a central postament (often with a hypostase: see below).
However, as Dahlgren (1940) correctly observed, there is a critical difference between a postament, which is a resistant nucellar protuberance into the embryo sac (the lateral parts having often been eaten away), and a small resistant group of nucellar cells not projecting into the embryo sac, for which he proposed the term "podium.
A postament is a remnant proximal column of nucellar tissue (Figs.
The postament and central conducting passage (Zuleitungsbahn) are homologous structures at different stages of development, commonly associated with enlarged dermal cells and also with large persistent antipodals.