A mycorrhiza (Greek: Î¼ÏÎºÏÏ, mykÃ³s, fungus, and ÏÎ¯Î¶Î±, riza, root, pl. mycorrhizae or mycorrhizas) is a symbiotic association between a fungus and the roots of a vascular host plant. The term mycorrhiza refers to the role of the fungi in the plants' rhizosphere, its root system. Mycorrhizae play important roles in soil biology and soil chemistry.
The dermis consists of a papillary and a reticular layer which serve to protect and cushion the body from stress and strain. Differentiate among the regions of the dermis and the hypodermis. The dermis is divided into a papillary region and a reticular region.
Key Points. 1  The dermis is divided into a papillary region and a reticular region. 2  The primary function of the dermis is to cushion the body from stress and strain, and to also provide: elasticity to the skin, a sense of touch, and heat. 3  The dermis contains hair roots, sebaceous glands, sweat glands, nerves, and blood vessels.