[CentOS] difference between cron and shell invocation.

I have a fairly involved root cron task that I moved verbatim from another server. On the original server, this task ran without problem. On the new server, when this task runs via cron, which I confirm is happening by looking in the cron log, no files are transferred and no error is reported. However, if I copy cron command from roots crontab and paste it into a terminal session on the new server then the task runs to completion and the files are transferred.

This task involves sshfs, fuse, and rsync and employs pki certificates for authentication. The fact that it works from the shell without alteration and yet not from cron is the issue.

Does anyone have any idea where I would start to track down what is going on?