witch's hair

noun3

1. •
   Any of various fruticose or hair-like lichens, especially in the genus Alectoria (e.g. Alectoria sarmentosa) or sometimes Usnea or Gowardia (e.g. Gowardia nigricans).

   • Witch's hair (Alectoria sarmentosa) Branches smoother than in Usnea, with tiny, elongated bumps. Forks in branches […] witch's hair lichens […] — 2014
2. •
   Dodder, any of various plants of the genus Cuscuta.
3. •
   A seaweed, Desmarestia aculeata.