Isoëtes virginica
Claytonia 3: 29. 1937.
Common names: Virginia quillwort
Synonyms: Isoëtes virginica var. piedmontana N. E. Pfeiffer Isoëtes piedmontana
Treatment appears in FNA Volume 2.
Revision as of 23:25, 29 July 2020 by imported>Volume Importer
Plants becoming terrestrial. Rootstock nearly globose, 2-lobed. Leaves deciduous, dull green, pale to dark-brown toward base, spirally arranged, less than 30 cm, pliant, gradually tapering to tip. Velum covering less than 1/3 of sporangium. Sporangium wall brown-streaked to completely brown. Megaspores white, 400–480 μm diam., boldly tuberculate to rugulate with cristate, occasionally branched to anastomosing ridges; girdle obscure. Microspores light-brown in mass, 27–33 μm, spinulose. 2n = 22, 44.
Phenology: Spores mature late in spring–early summer.
Habitat: Mud flats and depressions on and around granite outcrops
Distribution
Ala., Ga., S.C., Va.
Discussion
Short plants with 15 to 50 leaves and a tendency toward lower and more open megaspore ornamentation have been called Isoëtes virginica var. piedmontana Pfeiffer.
Selected References
None.
Lower Taxa
None.
... more about "Isoëtes virginica"
separating +
Virginia quillwort +
alternating +
vascular +
surrounding +
vascular +
obscure +
several +
Present +
septate +
longitudinal +
simple +
arranged +
straight +
deciduous +
pliant +
recurved;erect;spreading +
surrounding +
tapering +
deltate;cordiform +
membranous +
exposed +
endosporic +
white +
globose +
9-celled +
monolete +
spinulose +
light-brown +
reniform +
textured +
brownish +
several +
fibrous +
hardened +
converging +
Claytonia +
1937 +
arising +
cormlike +
brown +
proliferous +
hardened +
multitailed +
Isoëtes virginica +
Isoëtes +
species +
covering +
brown-streaked;completely brown +
terrestrial +
heterosporous +