P. endiviifolia usually has green or even blackish-green thalli up to about 1 cm wide, without reddish tinges. In autumn and early winter they develop numerous, narrow (to about 6 mm wide) branches at the tips (see right photograph) which are sometimes so abundant that they obscure the broader thalli on which they have developed. Plants are dioicous. A vertical tube surrounds the female organ. This tube has a closely toothed mouth.