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.
What causes linea nigra? A: According to What to Expect, linea nigra is caused by an influx of the same pregnancy hormones that cause freckles, dark areolas and other pigmentation changes during pregnancy. Linea nigra is a normal symptom of pregnancy and usually fades without any intervention after birth. Continue Reading.