The Cardinals reportedly could be without lefthander Mark Mulder and center fielder Jim Edmonds for the rest of the season. The web site of the St. Louis Post Dispatch reported Wednesday that Mulder will undergo an MRI and further testing on his ailing left shoulder after lasting just 1 2/3 innings in Tuesday's start. In a separate story, the website also reported that Edmonds, who has been suffering from post-concussion syndrome, also will undergo tests this week. The Cardinals are uncertain whether he will return this season.