Diagnosis: Sharp, subparallel furrows, paired or forming groups of up to 5, irregularly spaced with interspaces equaling about 1/3 to 1/2 of one furrow length. Groups of furrows are arranged in straight or meandering lines subparallel to each other, or irregularly distributed over the surface. Each individual furrow is transversely oriented in relation to the line. Most individual furrows are straight, but some are slightly arched