Pentagramma triangularis subsp. semipallida

(J. T. Howell) Yatskievych

Amer. Fern J. 80: 16. 1990.

Endemic
Basionym: Pityrogramma triangularis var. semipallida J. T. Howell Leafl. W. Bot. 9: 223. 1962
Treatment appears in FNA Volume 2.

Petiole glabrous, not viscid-glandular. Blade thin and herbaceous, sometimes thick (but not leathery), not viscid-glandular, abaxially densely white-farinose, adaxially glabrous. Distal pinnae mostly regularly lobed. Proximal basiscopic lobes of basal pinnae pinnatifid, often deeply so.


Habitat: Chaparral, pine and oak woodlands
Elevation: 100–900 m

Discussion

Pentagramma triangularis subsp. semipallida, as here treated, remains heterogeneous. Diploid (based on spore size) populations occur in the foothills of the Sierra Nevada in Butte County, California. Tetraploids (based on spore size) of similar morphology are apparently restricted to Santa Barbara County, California, including the adjacent Channel Islands. The relationship between these two variants has not been studied in detail.

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

George Yatskievych +  and Michael D. Windham +
(J. T. Howell) Yatskievych +
Pityrogramma triangularis var. semipallida +
glabrous +  and white-farinose +
pinnatifid +, 1-2-pinnate-pinnatifid +  and triangular-pentagonal +
100–900 m +
yellow adaxially bright green +  and yellowish green +
glabrous +  and glandular +
obcordate;reniform +
Chaparral, pine and oak woodlands +
monomorphic +
recurved +  and reflexed +
noncircinate +  and circinate +
5 cm50 mm <br />0.05 m <br /> (40 cm400 mm <br />0.4 m <br />) +
not recurved +
chestnut-brown;dark-brown +
nearly +  and rounded +
Amer. Fern J. +
bicolored with black +
persistent +
tan +  and brown +
trigonal +, globose +  and globose-tetrahedral +
ascending +, erect +  and short-creeping +
Pityrogramma triangularis +
Pentagramma triangularis subsp. semipallida +
Pentagramma triangularis +
subspecies +
crescent--shaped +  and roundish +