Those umbrella/pinecone things

[ReneZ]

Interesting! The one in the old St.Peter does have a cross, though this does perhaps not say much.

A bit off-topic, nice to see how similar the old St.Peter and the (restored) St.Paul were.
The drawing of St. Peter is from You are not allowed to view links. Register or Login to view.
(I happen to be a big fan of the history of the city of Rome, so took note of this MS when I first saw it).