Species description:
Photobiont a lime-green to grass-green alga; upper surface generally greenish, especially when wet (Note: check sheltered lobes); wart-like cephalodia sometimes present over upper or lower surface AND
Cephalodia absent over upper surface; upper surface smooth AND
Thallus attached to substrate at single point along margin; veins darkening, generally highly contrastive with pale interspaces; apothecia present, situated near lobe margins, never sunken

Comments:
The cephalodia of P. venosa may become detached and develop into the tiny, Leptogium-like lobules often found growing at the base of this species.

Contents:
Green phototype: phlebic acid A and B, tenuiorin, zeorin and one unidentified substance (Kurokawa et al.1966); blue-green phototype: no lichen substances reported (Tønsberg and Holtan-Hartwig 1983).

Source:  Lichens of British Columbia

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Illustration By:  Trevor Goward