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Bark is fine. It will only affect the top layer of soil, and your roses' roots will be much deeper, so won't be affected.
Are you feeding your plants regularly throughout the summer? Last summer, for example, was so wet that a single spring feed would have been washed out of the ground, leaving the plants very hungry.
Having had suckers from a tree two houses away in my front garden I'm afraid that I have to agree with Jo - it can be a real nuisance.
Since they're only young cuttings you could keep them in pots over winter. Do lag the pots, though - even though they're hardy, they prefer not to have frozen roots.
It's unlikely to be mould or fungi - slime mould would need a compacted and very wet soil.
Most likely water-retaining gel - see if it vanishes after a few dry days. In any case, very unlikely to be anything to worry about.
Have a look at my answer to this question here, too, for more treatment details.
Definitely plant them now - there's no point to keeping them in pots. Clematis should be planted about 6" (15cm) deeper than it is in the pot.
Could it be canker? Check here.
It's easiest to put soil in the pot with them - not only do they get more protection, but it'll stop them drying out.
Did it appear after rain? Is it white? If so, it may be water-retaining granules from the soil of a plant that you have planted there.