I think what you are talking abaut are artifacts caused by the bit-depth of your
graphics display, actually noticable very well at grayscale - even with 32 bit
colours. So what you could do to solve the problem is to introduce a small
amount of noise by adding the following line to your plane:

plane
{ y, -1.4
  texture {Surface}
  finish {crand 1/16}  // a little bit noise
}

....or to the whole scene, if it is very dark:

#default {finish {crand 1/16}}

I hope this helps! :)

Regards, Florian

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