Pellaea glabella subsp. missouriensis

(G. J. Gastony) Windham

Contr. Univ. Michigan Herb. 19: 39. 1993.

Endemic
Basionym: Pellaea glabella var. missouriensis Gastony Amer. Fern J. 78: 64. 1988
Treatment appears in FNA Volume 2.

Some ultimate segments (especially terminal segments) with hairlike scales abaxially near midrib; sporangia containing 64 spores; spores averaging 38–52 µm diam. 2n = 58.


Phenology: Sporulating summer–fall.
Habitat: Cliffs and ledges, apparently confined to limestone
Elevation: 100–300 m

Discussion

This diploid taxon is currently known only from southeastern Missouri in the Ozark region, but a thorough survey of spore number per sporangium in Pellaea glabella from eastern North America may yield additional localities. Plants of P. glabella subsp. missouriensis occasionally hybridize with P. glabella subsp. glabella; the hybrids are apogamous pentaploids resembling P. glabella subsp. glabella (G. J. Gastony 1988).

Selected References

None.

Lower Taxa

None.
Michael D. Windham +
(G. J. Gastony) Windham +
cordate +, truncate +  and rounded +
Pellaea glabella var. missouriensis +
glabrous +  and pubescent +
linear-oblong +  and ovatelanceolate +
1cm;8cm +
erose-denticulate +
straight +
100–300 m +
yellow +  and white +
obcordate;reniform +
Cliffs and ledges, apparently confined to limestone +
monomorphic +
clustered;widely scattered +
recurved +  and reflexed +
noncircinate +  and circinate +
2 cm20 mm <br />0.02 m <br /> (40 cm400 mm <br />0.4 m <br />) +
? (?) +  and ? (?) +
entire +, erose +  and dentate +
entire +  and denticulate +
pubescent +  and glabrous +
Sporulating summer–fall. +
Contr. Univ. Michigan Herb. +
reddish-brown +
persistent +
occasional +
hairlike +
thin +, 0.1mm +  and 0.3mm +
brown +  and tan +
cristate +  and tetrahedral-globose +
dark colored +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Pellaea glabella subsp. missouriensis +
Pellaea glabella +
subspecies +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
leathery +  and herbaceous +
crescent--shaped +  and roundish +
branched +  and anastomosing +