Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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PTERIDACEAE

BRAKE FAMILY

Alan R. Smith and Thomas Lemieux

Perennial, in soil or on or among rocks; rhizome creeping to erect, scaly
Leaves generally all ± alike (or of 2 kinds, fertile and sterile), generally < 50 cm, often < 25 cm; petiole generally thin, wiry, often dark, in transverse section with vascular strands generally 1–3, less often many in a circle; blade generally pinnate or ± palmate-pinnate (see Adiantum ), often 2 or more compound, lower surface often with glands, ± powdery exudate, hairs, or scales; segments round, oblong, fan-shaped, or otherwise, veins generally free
Sporangia in sori or not, marginal, submarginal, or along veins, sometimes covered by recurved, often modified segment margins (false indusia); true indusia 0; spores spheric, sides sometimes flat, scar with 3 radiating branches
Genera in family: ± 40 genera, 500 species: worldwide, especially dry areas. Definition of Cheilanthes and related genera problematic; traditional limits often untenable.

PENTAGRAMMA

GOLDBACK or SILVERBACK FERN

Plant in soil or rock crevices; rhizome short-creeping-decumbent, generally 3–5(8) mm wide, scales linear-lanceolate, with darker mid-stripe
Leaf: petiole 5–20(32) cm, 0.5–2(3) mm wide; blade generally 2–3-pinnate, 2–8(15) cm, triangular or generally 5-sided, with white or yellow exudate on lower surface, with or without exudate on upper surface, main axis shallowly to deeply grooved on upper surface; lowermost 1° leaflets each strongly asymmetric (more developed on basal surface); veins free
Sporangia along veins ± throughout; segment margins unmodified, recurved or not
Species in genus: 2 species: w North America. A puzzling complex of intergrading chemical, chromosomal, and morphological variants (see Yatskievych et al. 1990 Amer Fern J 80:9–17); for these we prefer the rank of var. but have used subsp. here because combinations at that rank already exist
Horticultural information: DFCLT.

Native

P. pallida (Weath.) Yatsk., Windham & E. Wollenw.

Rhizome tip, including scales, covered with white exudate
Leaf: petiole dark brown to generally blackish, with white exudate; blade 2–8(12) cm, pale to olive green, upper surface with white exudate, lower densely covered with white exudate; lower 1° leaflets 2–6(8) cm
Chromosomes: 2n=60
Ecology: Generally in or near granitic soil, rock, boulders
Elevation: 100–1200 m.
Bioregional distribution: Sierra Nevada, Inner South Coast Ranges
Synonyms: Pityrogramma triangularis (Kaulf.) Maxon var. p. Weath

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bioregional map for PENTAGRAMMA%20pallida being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Pentagramma pallida
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