Pentagramma triangularis has a distribution from British Columbia south to Washington, Oregon, California and Nevada, Arizona and Baja California. Specific occurrences within the California Floristic Province and the Modoc Plateau (caves in Lava Beds National Monument), East of Sierra Nevada, as well as the Desert Mountains.

Canada

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

Pentagramma triangularis occurs in rock crevices and at the base of overhanging boulders in drainages and on slopes and roadbanks. Occasional plants in which the farina is nearly absent may be encountered. These have been described as Pityrogramma triangularis var. viridis Hoover, a name of uncertain application that appears to refer to misshapen-spored hybrids of various parentage within the Pentagramma triangularis complex.

Petiole chestnut brown to dark brown, somewhat shiny, glabrous or sometimes viscid-glandular or rarely somewhat white-farinose proximally. Blade thin and herbaceous to thick and leathery, abaxially densely farinose, farina white or yellow, adaxially bright green to yellowish green when fresh, glabrous to glandular or viscid.

Gymnogramma triangularis Kaulfuss, Enum. Filic., 73. 1824; Pityrogramma triangularis (Kaulfuss) Maxon

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Species: 1
Species With Barcodes: 1

Rounded Global Status Rank: G5 - Secure

Canada

Rounded National Status Rank: NNR - Unranked

United States

Rounded National Status Rank: NNR - Unranked

Comments: Kartesz' 1994 checklist spelled the genus name "Pentagrama", but he corrected the spelling to "Pentagramma" in his August 1997 draft dataset, which agrees with the spelling in various other sources (Hickman, 1993; Flora of North America, 1993).