Posted: 08/03/2013 at 06:59
I agree with Verdun - don't worry, they'll grow new ones soon. It might be an idea to re-pot them ths spring so they've got lots of nutrients to grow new leaves with.
The little growths will be lichen - totally harmless and indicative of good air quality - it grows on slow-growing twigs and does no harm - look at it under a magnifying glass - it's absolutely beautiful 