t are a source of the dye archil and of litmus) S: (n) Usnea, genus Usnea (widely distributed lichens usually having a greyish or yellow pendulous freely branched thallus) member holonym member meronym direct hypernym / inherited hypernym / sister term S: (n) Evernia, genus Evernia (lichens of the family Usneaceae having a pendulous or shrubby thallus) S: (n) Ramalina, genus Ramalina (shrubby lich