Facts about Small-leaf False Cloak Fern (Argyrochosma microphylla)

Distribution

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Pellaea microphylla Mett. ex Kuhn:
Mexico (Mesoamerica)

SPECIMEN BASED RECORD. Published protolog data. http://www.tropicos.org/Reference/9990002

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Source: Missouri Botanical Garden

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National Distribution

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United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Source: NatureServe

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Morphology

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Argyrochosma microphylla is probably the most distinctive species of Argyrochosma in the flora. Chromosome studies by I. W. Knobloch et al. (1973) suggest that it may include diploid and tetraploid cytotypes.

Flora of North America @ eFloras.org

Source: Missouri Botanical Garden

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Description

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Stem scales brown. Leaves 7--25 cm. Petiole brown, 0.75--1.5 mm diam. Blade deltate to ovate, 3--4-pinnate proximally, leathery, abaxially and adaxially glabrous; rachis flattened or shallowly grooved adaxially. Pinna costae straight to somewhat flexuous, branches rarely arising from prominent angles. Ultimate segments articulate, dark color of stalks stopping abruptly at segment bases; segment margins recurved to revolute, often concealing sporangia; veins obscure adaxially. Sporangia submarginal, borne on distal 1/3 of secondary veins, containing 64 spores. 2 n = 54.