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.
Nigra Arborvitae. The Nigra Arborvitae, also known as the 'Dark Green' Arborvitae, is a hardy, low maintenance tree. It's a great choice as a privacy screen, and perfect as a hedge or natural fence. It is one of the best varieties for cold climates. Unlike some evergreens, 'Nigra' will keep its dark green color all winter long.