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white growth on seedlings

Hi-
        This is the first year I've tried starting perennials from seed.  I
have several trays planted including two of those mini-greenhouse trays (72
cell) of coneflowers (purple and white).  In a couple of the cells of the
purple coneflowers, the seedlings have a white fuzzy growth on them.  The
growth is at the base of the stem and is bending the seedling over (in one
cell the stem has bent over to the point that the seed is up out of the
soil).  I had been leaving the plastic dome cover on the seedlings because
the white coneflowers didn't appear to be germinating.  Since I noticed this
growth this morning, I removed the cover hoping some air on the seedlings
would help.  Only a couple of the cells are affected at the moment.  Is this
the dreaded "damping off"?  I understand that inadequate air flow is one
problem with this.  Any preventative measures I should take to keep the
other seedlings healthy besides increasing the air flow (i.e. should I dump
the infected guys?).  I'd hate to lose them all.

Many thanks,
Brenda
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