Thallus: Fruticose, composed of slender (up to 1 mm wide) cylindrical branches with numerous fine side branches.  When stretched (Fig. A), the outer part of the thallus breaks into short segments strung on an elastic inner core.  Exterior dull greenish-yellow, covered with minute warts. (Fig. C)(Useahandlens).  Attached to the bark by a black constricted base.

Apothecia:  Rare.

Soredia:  Often present; formed in circular soralia on themajor branches (Fig. B) (Use a hand lens).

Isidia:  Present.

Comments: The cylindrical thallus with an elastic inner core and a black base distinguishes this species from other common fruticose lichens on twigs.