first one definately looks like microsorium but not seen the forked leaves before :?
however, there are several cultivated varieties of m. pteropus - will keep looking for this one 'cos i like it
can you get any more pic's of it ?
quite sure the second one is not echinodorus uruguayensis tho'
i was trying to grow this recently (but not very successfully

)
needs more space than i could give it !!
think it might be aponogeton crispus, but looks 'below it's best' condition (

)
leaf shape might not be truely representative
is it growing from a bulb ?