Are there any grubs not present on the Collector map?

Question

I'm missing one grub. Grubfather won't give me the Grubberfly Elegy, there's one visible hole left in the grub nest.

I got the collector map, and collected all the grubs that were marked on it - and no joy, one is missing. Where can it be?

Answer 1

I got it. The Collector's map doesn't display grubs that are in areas, for which you don't have a regular map (didn't purchase it from Conifer). For the longest time, I didn't have the map for Fog Canyon, and as soon as I purchased it, the missing grub showed up above Teacher's Archives.

Answer 2

https://hollowknight.fandom.com/wiki/Map_and_Quill#The_Collector.27s_Map

The Collector's Map indeed shows the locations of all 46 Grubs on the map, marked by a pin. It's possible that one of your Grubs is just in a really weird spot. Scour the map! (You can also watch this video and skip to 7:22, where he scrolls through the whole map.)

For example, this one tripped me up on my own playthrough for the longest time:

To save this grub, there's a fake wall you need to break in Deepnest. In my own playthrough I would never have known that without the map.