Isoëtes georgiana

Luebke

Amer. Fern. J. 82: 24. 1992.

Common names: Georgia quillwort
Treatment appears in FNA Volume 2.

Plants aquatic, emergent. Rootstock nearly globose, 2-lobed. Leaves deciduous, olive green, pale toward base, spirally arranged, to 40 cm., pliant, gradually tapering toward tip. Velum covering less that 3/4 of sporangium. Sporangium wall ± brown-streaked. Megaspores white, 450–650 μm diam., cristate to reticulate with broad, jagged ridges; girdle obscure. Microspores light-brown in mass, 23–33 μm, papillose. 2n = 66.


Phenology: Spores mature late summer.
Habitat: Creeks

Discussion

Isoëtes georgiana is known only from Worth County, Georgia. An early collection from this locality was reported by B. M. Boom (1982) to be I. engelmannii x piedmontana, but the broad velum and bold texture of the megaspores suggest a possible involvement of I. flaccida.

Of conservation concern.

Selected References

None.

Lower Taxa

None.
... more about "Isoëtes georgiana"
several +  and 1 +
W. Carl Taylor +, Neil T. Luebke +, Donald M. Britton +, R. James Hickey +  and Daniel F. Brunton +
Luebke +
Georgia quillwort +
alternating +
Creeks +
pale +  and olive green +
straight +
deciduous +
recurved;erect;spreading +
tapering +
0 cm0 mm <br />0 m <br /> (40 cm400 mm <br />0.4 m <br />) +
deltate;cordiform +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
membranous +
Spores mature late summer. +
Amer. Fern. J. +
branched +  and simple +
2-lobed +  and globose +
0.3 cm3 mm <br />0.003 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Isoëtes georgiana +
Isoëtes +
species +
brown-streaked;completely brown +
ephemeral +, evergreen +  and perennial +