Notholaena aschenborniana

Klotzsch

Linnaea 20: 417. 1847.

Illustrated
Synonyms: Cheilanthes aschenborniana (Klotzsch) Mettenius Chrysochosma aschenborniana (Klotzsch) Pichi-Sermolli
Treatment appears in FNA Volume 2.

Stem scales concolored, margins black, undifferentiated, thick, ciliate. Leaves 8–35 cm. Petiole black, much shorter than blade, rounded adaxially, covered with ciliate and stellate scales. Blade lanceolate, usually 2-pinnate, 3–6 times longer than wide, abaxially with whitish or yellowish farina completely concealed by overlapping ciliate and deeply dissected stellate scales, adaxially with scattered stellate scales; basal pinnae equal to or slightly smaller than adjacent pair, ± equilateral, proximal basiscopic pinnules not greatly enlarged. Ultimate segments sessile to subsessile, narrowly adnate to costae; segment margins slightly recurved, rarely concealing sporangia. Sporangia containing 32 spores. n = 2n = 90, apogamous.


Phenology: Sporulating summer–fall.
Habitat: Rocky slopes and cliffs, apparently confined to limestone
Elevation: 300–1900 m

Discussion

Although Notholaena aschenborniana is often described as nonfarinose, the abaxial glandular farina characteristic of all species of Notholaena as defined here is present beneath the dense covering of scales. All individuals examined chromosomally by M. D. Windham (unpublished data) were apogamous triploids that apparently arose through autopolyploidy. Further investigation is necessary to determine whether or not 64-spored, diploid populations of N. aschenborniana are still extant.

Selected References

None.

Lower Taxa

None.
... more about "Notholaena aschenborniana"
Michael D. Windham +
Klotzsch +
slightly smaller +
rounded +  and truncate or cuneate +
lanceolate +
Ariz. +, Tex. +  and Mexico +
300–1900 m +
yellowish +  and whitish +
glandular-farinose +
obcordate;reniform +
Rocky slopes and cliffs, apparently confined to limestone +
monomorphic +
recurved +  and reflexed +
noncircinate +  and circinate +
8 cm80 mm <br />0.08 m <br /> (35 cm350 mm <br />0.35 m <br />) +
undifferentiated +
entire +, denticulate +  and ciliate +
Sporulating summer–fall. +
enlarged +
scattered +  and overlapping +
bicolored;black +
persistent +
dissected +
Illustrated +
black +  and dark-brown +
tetrahedral-globose +  and globose +
granulate +
dark-colored +
ascending +  and horizontal +
Cheilanthes aschenborniana +  and Chrysochosma aschenborniana +
Notholaena aschenborniana +
Notholaena +
species +
0 cm0 mm <br />0 m <br /> (?) +  and 0.4 cm4 mm <br />0.004 m <br /> (?) +
1 +  and several +
crescent--shaped +  and roundish +