Dark-green moss
From MUME
Dark-green moss is used by the dwarven dye-maker to create the dye required for the elven weaver's quest. It grows on an isolated ridge on the bank of the Nan Duin that can only be reached by rope bridge.
A small patch of dark-green moss grows in the deepest shade. >examine moss This moss is much darker than most varieties, appearing nearly black in some places. It has an odd, almost oily sheen that seems to both absorb and reflect light simultaneously. >consider moss It is some dark-green moss. It weighs a few ounces.