Terms discussed: black line (pl. black lines)
In polypores (so far), a fruiting body consisting of two distinct layers, often separated by a black line. The upper layer usually gives rise to the tomentum (duplex fruiting bodies are usually hairy), and the lower layer gives rise to the pores and is continuous with them (not as in the boletes, where the pores can usually be peeled cleanly from the cap).
Sometimes, a black line is visible in cross-section of the fruiting body, but the context on either side of it can't be cleanly separated from one another; in this case, the fruiting body is not duplex, although the black line is still an important diagnostic character.
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