Cheilanthes arizonica

(Maxon) Mickel

Phytologia 41: 433. 1979.

Common names: Arizona lip fern
Basionyms: Cheilanthes pyramidalis subsp. arizonica Maxon Amer. Fern J. 8: 116. 1918
Synonyms: Cheilanthes pyramidalis var. arizonica (Maxon) Broun
Treatment appears in FNA Volume 2.

Stems short-creeping, usually 4–8 mm diam.; scales uniformly dark-brown or with poorly defined, dark, central stripe, narrowly lanceolate, straight to slightly contorted, loosely appressed, usually persistent. Leaves clustered, 8–25 cm; vernation circinate. Petiole dark-brown, grooved most of length adaxially. Blade elongate-pentagonal, 3-pinnate-pinnatifid to 4-pinnate at base, 4–10 cm wide; rachis grooved adaxially, lacking scales, with minute, widely scattered hairs. Pinnae not articulate, dark color of stalk continuing into pinna base, basal pair conspicuously larger than adjacent pair, inequilateral, proximal basiscopic pinnules enlarged, glabrous adaxially. Costae green adaxially for most of length; abaxial scales absent. Ultimate segments elliptic to linear-oblong, not beadlike, the largest 4–10 mm, abaxially with reddish, scattered, sessile glands, adaxially glabrous; false indusia marginal to obscurely inframarginal, strongly differentiated, 0.25–0.50 mm wide. Sori ± continuous around segment margins. Sporangia containing 32 spores. n = 2n = 90, apogamous.


Phenology: Sporulating summer–fall.
Habitat: Rocky slopes and ledges, on quartzite or igneous substrates
Elevation: 1900–2400 m

Distribution

V2 670-distribution-map.gif

Ariz., Mexico, Central America in Guatemala, Honduras

Discussion

The distinctive Cheilanthes arizonica is an apogamous triploid of unknown parentage. In the flora, it is known from about seven localities, all of which are situated within 50 km of the Mexican border.

Selected References

None.

Lower Taxa

None.

"wide" is not a number.

... more about "Cheilanthes arizonica"
Michael D. Windham +  and Eric W. Rabe +
(Maxon) Mickel +
cuneate +, truncate +  and rounded +
Cheilanthes pyramidalis subsp. arizonica +
scaly rarely glabrous adaxially pubescent +  and glabrous +
3-pinnate-pinnatifid +  and 4-pinnate +
4cm;10cm +
Arizona lip fern +
Ariz. +, Mexico +, Central America in Guatemala +  and Honduras +
1900–2400 m +
yellow +  and white +
obcordate;reniform +
Rocky slopes and ledges, on quartzite or igneous substrates +
minute +
monomorphic +
clustered;widely scattered +
recurved +  and reflexed +
noncircinate +  and circinate +
8 cm80 mm <br />0.08 m <br /> (25 cm250 mm <br />0.25 m <br />) +
circinate +
denticulate +  and entire +
glabrous +, scaly +  and pubescent +
flattened +  and rounded +
Sporulating summer–fall. +
not articulate +
conspicuously larger +
enlarged +
inequilateral +
with poorly defined , dark , central stripe;dark-brown +
straight +
persistent +
lanceolate +
yellowish +, brown +  and black or gray +
cristate +  and tetrahedral-globose +
dark colored +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
ascending +  and horizontal +
Cheilanthes pyramidalis var. arizonica +
Cheilanthes arizonica +
Cheilanthes +
species +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0 cm0 mm <br />0 m <br /> (?) +  and 0.4 cm4 mm <br />0.004 m <br /> (?) +
crescent--shaped +  and roundish +
branched +  and anastomosing +