Basicly try mounting the floppy with "mount -t fstype" where fstype is the filesytem of the floppy - you'll have to guess that, maybe hfs.
Do a "cat /proc/filesystems" to see what filesystems your kernel supports, if it doesn't support that many, or no apple looking ones ( such as hfs ), Knoppix [knoppix.net]'s kernel includes support for many filesystem types so you could try a copy of that.
"mount -t auto /dev/fd0 /mount/point" sometimes works, too. I've used it before in fstab entries where I wanted to be able to use assorted different formats of floppies. It's not consistent, but it's worth a try.