Plant pictures as composite images

[Oocephalus]

The first screensnap looks like the residue from two bell-shaped flower heads that appear to have been pressed against the vellum. This is not a stain from the other side.

It's not a stain from the other side of the same folio (f26v), but from the opposite folio, f27r. I've attached a screenshot of the relevant detail. This is another piece of evidence that the painting was only done after the folios had been reordered, as the dialect of f26 is Currier-B while that of f27 is Currier-A.
A trace of the other thing you found (I'm not sure what it is) can also be found on f27r:
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