Despite the common names ringworm and dermatophyte, the disease is caused by a fungus, not a worm or plant. Trichophyton, Microsporum, and Epidermophyton are the most common genera that cause ringworm in humans. These organisms feed on keratin, the major structural component of hair, skin and nails.
Thuja occidentalis 'Nigra'. Naturally broad, pyramidal evergreen shrub displays deep green, scalelike needles arranged in flat sprays. New light green needles emerge in spring, deepening in color as they mature. Deep green color adds contrast to winter landscape.
Even if the river birch (Betula nigra) grew only an inch per year, it would have a loyal fan club. It boasts all the beauty and grace of the birch family, with its shiny, peeling bark and delicate leaves that turn brilliant colors in autumn, blended with the easy-care ways of a native species.