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Perennial herb, in soil or on or among rocks; rhizome creeping to erect, scaly. Leaf: generally all ± alike (or of 2 kinds, fertile, sterile), generally < 50 cm, often < 25 cm; stipe generally thin, wiry, often dark, ×-section with vascular strands generally 1–3, less often many in circle; blade generally pinnate or ± palmate-pinnate (see Adiantum), often >= 2-compound, abaxially often with glands, ± powdery exudate, hairs, or scales; segments round, oblong, fan-shaped, or other, veins generally free. Sporangia: in sori or not, marginal, submarginal, or along veins, covered by recurved, often modified segment margins (false indusia) or not; true indusia 0; spores spheric, sides flat or not, scar with 3 radiating branches.
± 40 genera, 500 species: worldwide, especially dry areas. [Windham 1993 FNANM 2:122–186] California members of Cheilanthes moved to the distantly related Myriopteris; Pellaea breweri to be moved as well, from a to-be-redefined Pellaea; traditional, often untenable limits of genera outside California also being clarified using molecular phylogenetics. —Scientific Editors: Alan R. Smith, Thomas J. Rosatti.
Key to Pteridaceae
Plant in soil or rock crevices; rhizome short-creeping, scales lance-linear, tan to ± red. Leaf: < 40 cm; hairs 0; scales 0; stipe cylindric, dark, glabrous or ± scaly at base; blade 2–5-pinnate, segments stalked, generally < 5 mm, round to oblong, blue- to gray-green, generally thick, veins obscure; axes, blades covered with ± white exudate abaxially or not. Sporangia: along veins for outer 1/3–2/3 of segments; segment margin unmodified, often only ± recurved; spores tan, coarsely ridged.Key to Argyrochosma
± 20 species: America. (Greek: silver ornament) Closer to Pellaea than to Notholaena.
Unabridged references: [Windham 1987 Amer Fern J 77:37–41]
Leaf: 5–15 cm; stipe dark brown; basal pinna stalk < 5 mm; pinnule stalk 0–1.5 mm; segments generally 2–5 mm. Sporangia: 64-spored.
2n=54,108. Generally calcareous rock crevices, cliff bases; 400–1800 m. s High Sierra Nevada, Outer South Coast Ranges, San Gabriel Mountains, White and Inyo Mountains, Desert Mountains; to southwestern Utah, Arizona. [Online Interchange]
Previous taxon: Argyrochosma
Next taxon: Argyrochosma limitanea subsp. limitanea
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Dec 22 2014
Citation for this treatment: [Author of taxon treatment] 2013. Argyrochosma, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=14137, accessed on Dec 22 2014
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© 2003 James M. Andre
|Geographic subdivisions indicated for the distribution of Argyrochosma jonesii|| Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).
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