Comments
provided by eFloras
Isoëtes boomii is known only from low, wet woods in Laurens County, Georgia. Early collections bearing only microspores were identified as I. flaccida. These were reported as I. flaccida x piedmontana and as having a velum coverage of 70--90% (B. M. Boom 1982), but recent collections have a velum coverage of less than 50%. The megaspore texture of broken lamellae and a narrow velum coverage do not indicate an I. flaccida influence.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
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Plants aquatic, emergent. Rootstock nearly globose, 2-lobed. Leaves deciduous, bright green, pale toward base, spirally arranged, to 45 cm, pliant gradually tapering toward tip. Velum covering less than 1/2 sporangium. Sporangium wall ± brown-streaked. Megaspores white, 460--610 μm diam., cristate to reticulate with thin ridges; girdle obscure. Microspores light gray in mass, 35--30 μm, papillose. 2n = 66.
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- cc-by-nc-sa-3.0
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Habitat & Distribution
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Spores mature in late summer. Flowering water in low woods; of conservation concern; Ga.
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- cc-by-nc-sa-3.0
- copyright
- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA