Pentagramma triangularis subsp. viscosa

(Nuttall ex D. C. Eaton) Yatskievych

Amer. Fern J. 80: 15. 1990.

Basionym: Gymnogramma viscosa (Kaulfuss) Maxon Ferns N. Amer. 2: 16. 1879
Synonyms: Pityrogramma triangularis var. viscosa (Nuttall ex D. C. Eaton) Weatherby Pityrogramma viscosa
Treatment appears in FNA Volume 2.

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. 2n = 60.

Habitat: Chaparral, pine and oak woodlands
Elevation: 50–500 m


V2 807-distribution-map.gif

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.

Selected References


Lower Taxa

George Yatskievych +  and Michael D. Windham +
(Nuttall ex D. C. Eaton) Yatskievych +
Gymnogramma viscosa +
Largely coastal +, Calif. +  and Mexico in Baja California. +
50–500 m +
Chaparral, pine and oak woodlands +
Amer. Fern J. +
Illustrated +
Pityrogramma triangularis var. viscosa +  and Pityrogramma viscosa +
Pentagramma triangularis subsp. viscosa +
Pentagramma triangularis +
subspecies +