Fig.
10.2-12.
Transverse section of leaf of yew (Taxus). These epidermis cells have a
complex shape: each has 2 or 3 large, horn-like
projections that are so uniformly red that they are probably pure
cutin. But the lower, central part of each horn (diagonal arrow) is darker red,
which may (or may not) indicate that the outer wall also is projecting up as
part of each papilla. The vertical arrow indicates an area where the microtome
knife cut the cell between two papillae (just a hint of a papilla in either the
background or the foreground).