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FNA | Family List | FNA Vol. 2 | Pteridaceae | Pellaea

12a. Pellaea glabella subsp. glabella Mettenius ex Kuhn

Pellaea atropurpurea (Linnaeus) Link var. bushii Mackenzie

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

Sporulating summer--fall. Calcareous cliffs and ledges, usually on limestone substrates; 0--1200 m; 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.

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


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