pass local variable to ssh

I need to append a line of text to a file on a remote machine where the directory path contains it's hostname. I need to do this on multiple systems, so I need to be able to discover the hostname on each one.
ex:
 line=blah,blah,blah
ssh user@server "echo $line >> /dir1/dir2/$HOSTNAME/destination file"
if I single quote my command it does not expand my $line variable before it runs it, if I double quote it it expands $HOSTNAME locally.
How can I pass my local $line variable to ssh and still have it evaluate $HOSTNAME correctly?
noidea50Asked:
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ozoCommented:
ssh user@server "echo $line"' >> /dir1/dir2/$HOSTNAME/destination file'

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TintinCommented:
ssh user@server "echo \$line >> /dir1/dir2/$HOSTNAME/destination file"
ozoCommented:
Which variable did you want to evaluate on which machine?
As I understood the question, the \ would have been on the $HOSTNAME
TintinCommented:
I completely misunderstood the question.

ssh user@server echo $line '>>/dir1/dir2/$HOSTNAME/destination file'
noidea50Author Commented:
That's just what I needed.
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