Here's an example that does no recusion of its own - it leaves that to File::Find. Instead, it puts everything into an array, and iterates through the array, detecting when a change of dir happens, by looking at the depth of the individual item. Probably as clear as mud? :)

It doesn't use File::Basename either, but does depend on you knowing the folder delimiter for your platform ('/' for me)

#!/usr/local/bin/perl -w
use strict;
use File::Find;

sub logGeneral { print @_, "\n";}

my $delim    = '/';
my $padding  = '  ';
my $depth    = 0;
my $ltype    = 'OL';

my $dir = $ARGV[0];
$dir ||= '.';

# sorted array of file and folder names
our @files;
sub proc { push @files, [ split $delim, $File::Find::name ]; }
find(\&proc, $dir);


# format it as a list!
my $lastdepth = 0;
for my $file ( @files ) {

  if ( scalar @$file > $lastdepth ) {
    # first entry in a sub-folder
    logGeneral $padding x $depth, "<$ltype>";
    $depth++;
    logGeneral $padding x $depth, "<LI>$file->[$#$file]";
  } else {
    if ( scalar @$file < $lastdepth ) {
      # have left a sub-folder
      # may have jumped back several levels
      for my $i ( 1 .. $lastdepth - scalar @$file ) {
        $depth--;
        logGeneral $padding x $depth, "</$ltype>";
      }
    }
    logGeneral $padding x $depth, "<LI>$file->[$#$file]";
  }
  $lastdepth = scalar @$file;

}

# finish off from the last entry
for my $i ( 1 .. $lastdepth ) {
  $depth--;
  logGeneral $padding x $depth, "</$ltype>";
}
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