Tags: Fern.
The Pteridales are ferns that have their sori in linear strips under the edge of the leaf tissue usually with the edge of the lamina reflexed over.This order is considered a family under the Smith classification. However this group a natural clade is clearly the most basal offshoot of the entire polypodioid line and if any portion of that clade is segregated as a separate order this would be the obvious one.
