Dawsonia (plant) lamella – chains of small cells on the upper surface of the leaves analogous to the mesophyll cells of vascular plant leaves. They increase the surface area of cell walls available for CO uptake, while at the same time maintaining layers of moist air between lamellae, reducing water loss. Lamella margins have a surface wax layer which prevents water from flooding into the interlamellar spaces. Dawsonia (plant) Dawsonia is a genus of acrocarpous mosses. "Dawsonia", along with other members of the order Polytrichales, are taller than most mosses and have thicker leaves. Their sporophytes have conducting systems analogous to those
Photoreceptor cell across different cone types. The process of phototransduction occurs in the retina. The retina has many layers of various cell types. The best-known photoreceptor cells ("rods" and "cones") form the outermost layer. They are the photoreceptors responsible for sight. The middle layer contains bipolar cells, which collect neural signals from the rods and the cones and then transmit them to the innermost layer of the retina, where the neurons called retinal ganglion cells (RGCs), a small percentage of which are themselves photosensitive, organize the signals and send them to the brain. Activation of rods and cones is actually hyperpolarization; when