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.
Red anthocyanin pigment in cells on the lower surface give a red underside that is frequently seen (Fig. D). When viewed from above, the leaf is dark green or may even have a purple-black color (Fig. E). Symmetrical patterns of white and green are due to the absence of chlorophyll in some tissues (Fig. F, G).