Plage (mycology) From Wikipedia the free encyclopedia A plage is a discrete, smooth and flat to concave patch near the former point of attachment to a basidium on otherwise textured spores. Click image. A plage is a clear, unornamented area on the basal area of an otherwise ornamented spore. It is characteristic of spores from the euagaric genus Galerina. External links[edit] Images[edit] [1] - line drawing [2] - photo This Agaricales-related article is a stub. You can help Wikipedia by expanding it.vte