Thank you for your reply and good spotting! Yes, I had just watered. It was the second time I have and I was nervous to do so as the medium hasn't really felt that dry the entire time, that may well be due to it being quite cold here at the moment (if cold can be considered 19 celcius daytime highs).
The humidity tray is basically a big glass platter with riverstones and spag round the edge to help wick the moisture up. I don't allow much water in the tray but haven't let it dry either. Where roots that are actually under the pot are - there are 3 or so of these, they have gone a little black where they rest on the rocks. I figure that our humidity is fairly low. Outside sits at average 50% (according to the weatherman) but inside I have no idea, I'm heading back to the nursery this w/e to get a hygrometer.
The roots that dried up/went squishy at the bottom I snipped off with sterilised scissors (they looked fine where they went back into the pot) and dabbed a bit of cinnamon on the cut ends. I don't think we can get physan? here. The roots had the thread like insides...
The phal is on my coffee table, and much to my other halves detriment I drag it to the (north facing) window for when I go to work and then back to the centre of the room at night as i worry it will get too cold up against the glass.
The little one in spag doesn't really have any roots that are going aerial so they aren't showing up as dry.
The parts I am worried about is the root in the second image just below the happy looking aerial root. Its kind of gone brown squishy and 'drawn' looking for about 2cm. It doesnt feel like there is anything inside it for that section. I figure I can see this root all the way down the side of the pot, so if it does need to 'go' I can probably snip it off and slide it out (this may be overly ambitious!)
And also in the third pic where it looks a bit discoloured where the roots join the plant...
I am probably being over protective but I have only just graduated from growing bonsai Crassula so this is a major shift in thinking for me!
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