((a)) ** .—** The Secretary may—

((1)) accept and use funds that may be donated in order to consolidate Federal land ownership within the existing boundaries of any System unit; and

((2)) encourage the donation of funds for that purpose, subject to the condition that donated funds are to be expended for purposes of this section only if Federal funds in an amount equal to the amount of the donated funds are appropriated for the purposes of this section.

((b)) ** .—** There are authorized to be appropriated for each fiscal year not more than $500,000 to match funds that are donated for those purposes.