Stratum basale epidermidis. Definition. noun. Latin term for basal cell layer of epidermis, the innermost layer composed of basal cells that lies at the base of the epidermis or above the dermis.Supplement. The cells of this layer are actively dividing to provide new cells to replenish lost skin from normal shedding.tratum basale epidermidis. Definition. noun. Latin term for basal cell layer of epidermis, the innermost layer composed of basal cells that lies at the base of the epidermis or above the dermis.
Lichens Contribute to Soil Formation. Lichens thrive in undisturbed sites where nothing else will grow. They grow on rocks, barren soil and the bark of dead or live trees. Lichens are not parasitic when they grow on trees, they just use the tree bark as a home. They enrich the soil by trapping water, dust and silt. When lichens die they contribute organic matter to the soil, improving the soil so that other plants can grow there. Lichens Fix Nitrogen
The types of organisms living in soil and the decomposition products of plant and animal tissues and wastesâor âhumusââin turn affect soil color. Organisms and humus also affect and the size and shape of the clumps of particles, called âpeds,â that make up the soilâs structure. Soils also differ from one another thanks to the shape of the landscape, or relief. Soils on slopes, for example, often experience more erosion and thus are shallower than soils on the top of a hill. Soils at the bottom of the slope are often much deeper due to the deposition of the eroded soil from the slope above.