Isoetes mississippiensis
species of Lycopodiopsida
Isoetes mississippiensis, the Mississippi quillwort, is a small aquatic pteridophyte from the family Isoetaceae.
Distribution and habitat
The species can be found in the southern part of Mississippi in the tributaries of the Pearl River. Isoetes mississippiensis occurs in persistent, sluggish streams in the southern part of Mississippi. Other plants that occupy the same habitat include the graminoids such as rushes and panicgrass. Isoetes mississippiensis only occurs in two known locations, neither of which is in a protected area.
Description
The rootstock of Isoetes mississippiensis is brown, bilobed, subglobose, and measures between 0.5 and 1.0 cm long and 1.0-1.5 cm wide. The sporophylls are a bright green which darkens with age and becomes pale towards the base. The sporophylls are also spirally arranged and can grow to 40 cm long and 2.0mm wide at the mid-length. Its sporangium are ovate, with most being between 4-10mm long and 4-5mm wide. It is distinct from other Isoetes species due to it having a chromosome count of 2n=22, the presence of laevigate megaspore ornamentation, and the differences of its habitat in comparison to similar species in the genus.
Begin with the source’s own compact description: “Isoetes mississippiensis” is species of Lycopodiopsida. The dossier treats that line as a proposition to test through Isoetes, mississippiensis and species, not as a finished interpretation.
Why this record matters
The phrase “species of Lycopodiopsida” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Mar 25, 2026. The linked authority identifier is Q28771438. None of the 0 selected statements returned an explicit reference.
A general summary may omit uncertainty, sample limits or methodological disagreement that is explicit in the technical record. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Isoetes mississippiensis” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.