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
This soil food web is the basis of healthy, living soil. Significant soil organisms involved in the soil food web include: 1) bacteria, 2) fungi, 3) protozoa, 4) nematodes, 5) arthropods, and 6) earthworms. 1  Bacteria â Bacteria are simple, single-celled microorganisms.2  Bacteria inhabit a wide variety of habitats, including soil. The bacteria contain more nitrogen than the protozoa can utilize and some ammonium (NH4) is released to plants. 2  Protozoa also prevent some pathogens from establishing on plants and function as a food source for nematodes in the soil food web. 3  Nematodes â Nematodes are small, unsegmented round worms.