Pellaea glabella subsp. glabella

Some ultimate segments (especially terminal segments) with hairlike scales abaxially near midrib; most sporangia containing 32 spores; spores averaging 60–72 µm diam. n = 2n = 116, apogamous.

Phenology: Sporulating summer–fall.
Habitat: Calcareous cliffs and ledges, usually on limestone substrates
Elevation: 0–1200 m

Distribution

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Ont., Que., Ark., Conn., Ill., Ind., Iowa, Kans., Ky., Md., Mass., Mich., Minn., Mo., Nebr., N.Y., Ohio, Okla., Pa., Tenn., Tex., Vt., Va., W.Va., Wis.

Discussion

G. J. Gastony (1988) has shown that this apogamous tetraploid was derived from Pellaea glabella subsp. missouriensis by an autopolyploid increase in chromosome number.

Selected References

None.

Lower Taxa

None.