I don't think perldoc can recursively search the PATH directories. It does have a -r switch which can recursively search the @INC directories: 
perldoc -h

    -r   Recursive search (slow)

[download]
If you really need this, I guess you could append all the PATH dirs to @INC.

See also perldoc -D

In reply to Re: perldoc PATH by toolic
in thread perldoc PATH by Anonymous Monk

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