Article: A cardinal who is not a bishop is still entitled to wear and use the episcopal vestments and other pontificalia (episcopal regalia: mitre, crozier, zucchetto, pectoral cross and ring). Even if not a bishop, any cardinal has both actual and honorary precedence over non-cardinal patriarchs, as well as the archbishops and bishops who are not cardinals, but he cannot perform the functions reserved solely to bishops, such as ordination. The prominent priests who since 1962 were not ordained bishops on their elevation to the cardinalate were over the age of 80 or near to it, and so no cardinal who was not a bishop has participated in recent papal conclaves.

Question: A cardinal who does not hold the title of "bishop" may not do what?
perform the functions reserved solely to bishops, such as ordination