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Flora of Scotts Creek Watershed

Fern Frond Pattern

Adiantum jordanii - California Maidenhair Fern

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Family Name: Pteridaceae

Common Name: California Maidenhair Fern

Origin: Native to California

Habitat: Moist woods and rocky canyons, shaded hillsides. Below 1200 m.

Life Form and Duration: Perennial Fern, 20-50 cm

Comments on overall growth: Fronds crowded, stipes 1-5 mm apart at attachment to rhizome. Rhizomes creeping, slender, 2 mm diameter, light brown lanceolate scales.

Foliage Type: Dormant in summer and dry periods

Foliage Description: Stipes (stem below laminae) and rachises (within laminae) shiny reddish-brown to black to purplish-black, 5-20 cm long, scaly at base. Laminae (divided blade of frond) twice pinnate, pinnae (primary divisions / forks) along main axis, overall lanceolate shape, 7-27 cm long, 2-13 cm wide. Pinnae with 3-10 pinnules (secondary division, ultimate segment) that are broadly fan shaped, symmetrical but no central axis, 5-15 mm long, 7-28 mm wide, apex rounded with margins of fertile segments narrowly incised (deeply cut) and sterile segments lobed a quarter of the way to base, generally 4 irregular lobes.

Indusia and Sori Description: Sori nearly continuous along margin, elongated to linear. Covered by folded over margin of blade segment as a false indusia, elongated to linear, 3-10 mm. Interrupted with 1-3 sori and false indusia per segment.

Spore Production: Early spring to mid-summer

Common Associates: Found under Arbutus menziesii, Lithocarpus densiflorus, Umbellularia californica, Quercus ssp.