2b. var. missouriensis Gastony
P. glabella ssp. missouriensis (Gastony) Windham
Spores 38–52 mm
in diameter, 64 per sporangium. 2n=58 (sexual).
Known thus far only from Carter, Dent, Jefferson, and Pulaski
Counties (endemic to Missouri). Limestone and dolomite bluffs.
The diploid, sexual variety of this species was first reported for the state by
Wagner et al. (1965). It is the rare progenitor of the more common, apomictic,
tetraploid var. glabella. Although it appears endemic to the Missouri
Ozarks, this easily overlooked taxon eventually may be found in other portions
of the species' range. For discussion of the hybrid between var. glabella
and var. missouriensis, see the treatment of the latter variety. For a
discussion of the hybrid between var. missouriensis and P.
atropurpurea, see the treatment of that species.