Myriopteris intertexta

Flora of Oregon

[Originally published in Flora of Oregon as Cheilanthes intertexta.]

Stems ascending or shortly creeping in rock crevices, much-branched and forming a caudex; scales dense and persistent, mostly bicolored with a well-defined, dark, central stripe and pale narrow margins.

Leaves short, seldom over 15 cm, produced in clusters from the caudex, non-circinate when young.

Petioles slender, up to about half of the leaf length; petiole and rachis dark brown, with a sparse indumentum of hairs and scales.

Blades (broadly) lanceolate, up to about 8 × 3 cm, 3-pinnate, pinnae on proximal half of blade more or less equal in length, distal pinnae reduced in size apically.

Ultimate segments oblong, convex, dark green, bead-like, and more or less glossy adaxially, concave, red-brown, and almost bowl-like abaxially with the leaf margin strongly recurved and arching, the edge thin and white, forming a false indusium; abaxial indumentum very dense, red-brown, extending to the leaf margin, composed of multilayered small scales and branched hairs; scales graduated, those appressed to the leaf surface deeply divided into narrow segments, outer scales narrowly ovate, margins ciliate near the base; adaxial leaf surface glabrous or with sparse hairs and scales.

Sporangia submarginal.

Rocky places. 700–1400 m. Sisk. CA, NV. Native.

Flora of North America

as described under Cheilanthes intertexta

Stems short-creeping, usually 3--7 mm diam.; scales usually bicolored, with broad, well-defined, dark, central stripe and narrow, light brown margins, linear-lanceolate, straight to slightly contorted, strongly appressed, persistent. Leaves clustered, 4--25 cm; vernation noncircinate. Petiole dark brown, rounded adaxially. Blade lanceolate to ovate-deltate, usually 3-pinnate at base, 1--4 cm wide; rachis rounded adaxially, with scattered scales and sparse monomorphic pubescence. Pinnae not articulate, dark color of stalk continuing into pinna base, basal pair not conspicuously larger than adjacent pair, usually equilateral, appearing glabrous to sparsely pubescent adaxially. Costae green adaxially for most of length; abaxial scales multiseriate, ovate-lanceolate, deeply cordate at base, with overlapping basal lobes, conspicuous, the longest 0.4--1 mm wide, imbricate, often concealing ultimate segments, long-ciliate, cilia usually confined to proximal 1/2. Ultimate segments oblong to ovate, beadlike, the largest 1--3 mm, abaxially densely covered with branched hairs and small, ciliate scales, adaxially with scattered branched hairs or glabrescent. False indusia marginal, weakly differentiated, 0.05--0.25 mm wide. Sori ± continuous around segment margins. Sporangia containing 64 spores.Sporulating late spring--fall. Rocky slopes and ledges, usually on igneous substrates; 500--2800 m; Calif., Nev., Oreg.Preliminary isozyme analyses support D. B. Lellinger's (1985) suggestion that Cheilanthes intertexta is a fertile allotetraploid hybrid between C . gracillima and C . covillei . It is morphologically most similar to the latter parent (see comments under C . covillei ), but it is occasionally confused with C . gracillima , with which it apparently hybridizes to form sterile intermediates that have been called C . gracillima var. aberrans M. E. Jones. Cheilanthes intertexta may also be confused with C . clevelandii , with which it is partially sympatric. In addition to the characters given in the key, C . intertexta is distinguished from closely related sexual species by having larger spores averaging more than 55 µm in diameter.

Herbarium specimens

https://www.pnwherbaria.org/images/thumbnail.php?Image=SOC07811.jpg
https://www.pnwherbaria.org/images/thumbnail.php?Image=SOC00187.jpg
https://www.pnwherbaria.org/images/thumbnail.php?Image=SOC18155.jpg
https://www.pnwherbaria.org/images/thumbnail.php?Image=HPSU014444.jpg
https://oregonflora.org/imglib/OSU_V/OSC-V-009/OSC-V-009303_tn.jpg