Hello, Dispator, welcome to the forum.
It takes a long time to get know exactly how the VMS illustrator draws things. I spent several months looking at all the drawings, over and over, before I began trying to ID a single one. I wanted to learn which parts were accurate, which parts were fanciful, which parts were stylized, how the illustrator perceived leaves, why certain things were added (like dots).
Once I was familiar with the drawing style, then I put two years of concerted effort into IDing them.
For your first ID, you've noted a fern for f3r.
A fern has joined leaves with spores in discrete pockets. The VMS You are not allowed to view links.
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Login to view. plant has a row of separate leaves, alternately red and green. I don't see any fused leaves or distinct pockets of spores. I'm fairly sure those dots along the edges of the leaves are not spores. I think they are intended to represent either actual dots (some plants have dots along the edges) or perhaps a tight ruffle that is hard to draw (many plants have these).
The next one is You are not allowed to view links.
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It's difficult to know what this plant might be because the leaves are stylized and possibly mnemonic in content. If they are mnemonic, then they might not represent the actual shape of the leaf. The seed or flower heads are exaggerated, which might mean that this is the part of the plant that is used. I don't have a good ID for this plant, but I suspect it might be a form of moss and the unusual shapes at the top might be sporophytes. There are a few mosses with very large round sporophytes which, when they ripen, open out into the disc-shaped flat areas one sees in the drawings.
I don't think the VMS illustrator would have drawn monkshood flowers this way and you must keep in mind that the flowers of this plant might not be blue, as the illustrator had a very limited palette with which to indicate flower colors and may POSSIBLY have chosen blue to symbolically represent seedheads (you can look at the other drawings to confirm whether this might be so, but there does appear to be a pattern).
You've identified 8r as Hedera (common ivy).
This ID illustrates why it is important to look at ALL the drawings before making IDs. If you look at the other drawings, you'll note that the VMS illustrator has a particular way of drawing plants that look like ivy or have ivy-like qualities (like a climbing habit or tendrils). This drawing is not drawn in the same way. It very specifically emphasizes one leaf and there are plants that will come up in the spring with one or two big leaves and sometimes no more (in fact, some only have one leaf), or the other leaves will follow quite a bit later.
We welcome your ideas, there's always room for a fresh take on things, and maybe it is some kind of ivy, but it's also important to become familiar with the VMS iconography. Whoever created the plant drawings had certain ways of doing things that were fairly consistent, even though the plants themselves are quite varied.