This is really cool! Not at all the mental picture I had for "slime molds," even having heard of them before. The little drawing/paintings(?) of them around 2 minutes in are also gorgeous. Really cool skill for a naturalist to be able to sketch/draw/paint what you find.
Caught my eye too. I'm pretty sure they were signed reduced giclee prints of larger original watercolors. If they were originals, they're executed in an uncommonly small format which is somewhat ridiculous from an artistic efficiency and control standpoint. I've known some miniature artists in the past and it tends to be the 'only' thing they're in to, but eccentricity dies hard...