English: Polystichum lonchitis abaxial (lower) leaf surface showing sori and indusia and a scaly rachis, growing near Snoqualmie Pass, Washington State. The tiny black spheres are sporangia (arranged in clusters called sori) and the papery gray covering on each sorus is an indusium. The translucent tan flakes protruding from the rachis (central stem of frond) are called scales.
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