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This image shows the cross-section of the outer cells of a leaf of pine. S, stoma; E, epidermis; C, cuticle; ST, stereome; and M, Mesophyll Cells.

Pine Leaf

This image shows the cross-section of the outer cells of a leaf of pine. S, stoma; E, epidermis; C,…

"a, Scales of Chionaspis pinifoliae upon pine-leaves, natural size; b, scale of male, enlarged; c, straight scale of female, enlarged; d, curved scale of female, enlarged." -Whitney, 1911

Pine Needle Scale

"a, Scales of Chionaspis pinifoliae upon pine-leaves, natural size; b, scale of male, enlarged; c, straight…