Up Ordinary epidermis Guard cells Thick cuticle Thicker cuticle Thin cuticle Parasitic plant Petal epidermis Sclerified epidermis Papillose epidermis Sculptured cuticle Elaborate cuticle Cuticular horns Radial walls Cuticle proper No epidermis Epidermal peels Cycad peel Paradermal Typical stoma Sunken stoma Stomatal orientation 1 Unusual orientation 2 Artifact Stomata and fibers Stomatal crypts Crypts, mag. Crypt margin Non-crypt Water lily Stomatal channels Groove, hi mag Subsidiary cells Ledges Papillae Trichome Uniseriate hair Peltate hair, mag Peltate, lo mag Branched hairs Trichome base Lithocyst, Ficus Lithocysts, hemp Bulliform cells Grass epidermis Multiple epi Uniseriate? Peperomia
| |
Fig.
10.4-1. Transverse section of milkweed petal (Asclepias
tuberosa). Compare the upper and lower epidermises of this petal – the
epidermis cells on the lower side have a rather ordinary shape, but those
on the upper side each bulge outward as a large papilla. You can see
that the papilla is formed as the outer wall and the protoplast bulge outward;
this same surface texture could also be created by having a round protoplast
with a thickened wall or an ordinary protoplast and wall with a thickened
cuticle. Papillose epidermis cells are quite common on petals, giving them a
velvety appearance.
|