How can I fetch text info from related form in email notification?

How can I fetch text info from related form in email notification?

Hello 

My trouble is as title.

Form2 has a lookup field(dropdown) to Form1.
In email notification of Form2, I'd like to tell the selected item's name to the person who input data.

When I tried like "<%=Form1%> ",
only ID of Form1 record appears in notification email.
Is there a good way to fetch info of Form1 record in Form2 notification email?

Thanks 
Tadashi