Petiole sometimes viscid-glandular. Blades thick and leathery, abaxially densely white-farinose and viscid-glandular, adaxially viscid-glandular. Distal pinnae mostly entire. Proximal basiscopic lobes of basal pinnae entire to undulate or crenate. 2 n = 60.

Chaparral, pine and oak woodlands; 50--500 m; largely coastal; Calif.; Mexico in Baja California.

Pentagramma triangularis subsp. viscosa was said to introgress with P . triangularis subsp. triangularis by K. S. Alt and V. Grant (1960), who noted both diploid and tetraploid plants of intermediate morphology at some sites where these two occur together.