Both players were issued with notices of complaints by new Scottish Football Association compliance officer Tony McGlennan following off-the-ball incidents in Monday night’s surprise 3-1 defeat to Scottish Championship rivals Hibernian at Ibrox.
They were each accused of “violent conduct” but while Mohsni has accepted his charge, Boyd will now argue his case before a Hampden hearing next Thursday.
Boyd is accused of trying to butt Jordan Foster after the pair went head-to-head in the Hibs box late in the game.
Tunisian Mohsni - who appeared to argue with his own supporters as he headed down the tunnel at half-time - has been cited after he appear to swing an arm at Leith defender Fontaine.
He lashed out after the Hibs defender knocked the ball out of his hands as he raced back to the half-way line following Nicky Law’s 55th-minute consolation goal for the hosts.
The 27-year-old will now miss Saturday’s Scottish Championship clash at Livingston on Saturday as well as Tuesday’s Petrofac Training Cup quarter-final clash with East Fife.
McGlennan is in his first week as the SFA’s new disciplinary chief after replacing Vincent Lunny.