I think it is plastic as its got a nice seam running around it. This is usually from a molded, ASA board.
I think I have sailed a Powerglide before, and I think I am right in it being plastic.
Have a look at
boardlady.com/anatomy.htm . I think it is one of the 'non-epoxy boards that she shows, the third from the bottom.
edit:
If you get stuck with someone that can repair it down the line and you really want to keep the board, the only things I can think of are:
Hot melt glue the bits of EPS and plastic back into place to restore the rough shape of the nose. Fill the cracks and gaps with a mixture of epoxy and microballoons. Roughen up the existing plastic with coarse sandpaper. Coat the whole nose section plus another couple of inches in epoxy and glass. This could be your new 'integrated' nose protector.
Of course if you find someone that knows what they are doing, feel free to disregard my suggestions.