Posted: 14/08/2014 at 07:35
If they're hederifolium it's the other way around - the underside of the corm is smooth and convex, the roots come from the top surface.
We've got lots which we're always having to move around and it used to confuse me until I found this site http://www.hederifolium.co.uk/html/cultural_advice.html
I think Coum are the same but Nut can confirm this I'm sure.
Addendum: I've done a bit of Googling which confirms that all cyclamen should be planted with the rough side upwards - the smooth slightly convex side is the bottom.