i think fjones problem with "comprised of" is the "of" part because most definitions of comprise mean "to contain".
i think his point is that the correct usage is "the collection comprises 5 works of art" not "the collection is comprised of 5 works of art".
that said, some dictionaries define comprise as a synonym of compose or constitute in which case the "of" would be ok. however, merriam webster, on this subject, says:
"Although it has been in use since the late 18th century, sense 3 is still attacked as wrong. Why it has been singled out is not clear, but until comparatively recent times it was found chiefly in scientific or technical writing rather than belles lettres. Our current evidence shows a slight shift in usage: sense 3 is somewhat more frequent in recent literary use than the earlier senses. You should be aware, however, that if you use sense 3 you may be subject to criticism for doing so, and you may want to choose a safer synonym such as compose or make up."
your call but i understand where fjones is coming from.
alasdair