I noticed is the large number of Nosema spores 

Hi Etienne,
I have never visited your country but it seems to me, that these spores look like Myosostis alpestri var asiatica pollen grains. If you have these flowers in Yukon, you get the pollen in great number inside your honey, as the honeybee will swallow them easily with the nectar due to their small size.
Can you use a tiny bit of fuchsine of Ziel in the glycerol to clarify ? When they bloom in spring, prepare a slide to compare.
You can check now with : https://pollen.tstebler.ch/MediaWiki/index.php?title=Datei:Myosotis_asiatica.jpg#filehistory
Georges, France

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