Contains 4 accepted taxa overall.
Characteristics
Classification
Citation
ISOETES Linnaeus, Sp. Pl. 1100. 1753.
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TYPE: Isoetes lacustris Linnaeus
Species
Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
---|---|---|---|---|
Isoetes appalachiana | APPALACHIAN QUILLWORT | Native Endangered-State OBL (NWPL) OBL (DEP) | ||
Isoetes boomii | BOOM'S QUILLWORT | Native Endangered-State OBL (NWPL) OBL (DEP) | ||
Isoetes flaccida | FLORIDA QUILLWORT | Native OBL (NWPL) OBL (DEP) | ||
Isoetes hyemalis | WINTERGREEN QUILLWORT | Native Endangered-State OBL (NWPL) OBL (DEP) |
Identification Key
1. Megaspores of variable size, shape, and ornamentation; sterile hybrids
1. Megaspores of uniform size, shape, and ornamentation; fertile species
2
2. Velum covering 80-100 percent of sporangium; megaspores 250-500 um wide, with low, broad tubercles or ridges, girdle smooth; 2n=22
3
2. Velum covering 10-30(50) percent of sporangium; megaspores 400-610 um wide, cristate to reticulate with thin ridges, girdle obscure; 2n=44 or 66
4
3. Leaves 1.25-1.5 mm wide; megaspores ca. 500 um wide, with dense ornamentation pattern of small tubercles
3. Leaves ca. 1.0 mm wide; megaspores 250-450 um wide, with coarse ornamentation pattern of broad tubercles or loosely interconnected vermiform mounds
4. Megaspores (460)575-610 um wide, cristate to reticulate with thick-walled reticulate ornamentation; 2n=66
4. megaspores 400-580 um wide, distinctly reticulate with dense pattern of tall, short-crested, almost echinate muri; 2n=44
5
5. Leaves 1-2.5 mm wide at mid-length, dark green to bright green or dull olive-green with whitish to pale brownish green bases; megaspore ornamentation moderately to evenly reticulate with few or no stand-alone short muri or tubercles, usually with equatorial band absent or a plain band with few spines
5. Leaves 0.5-1.5 mm wide at mid-length, blackish-green to olive green in age or upon drying; megaspore ornamentation broken-reticulate to almost spiny with numerous tubercles often with short, mostly stand-alone muri or with broken ridges, usually with an equatorial band of numerous spines
Genus Synonyms
Synonym | Full Citation | Basionym | Type |
---|---|---|---|
Calamaria | Calamaria Boehmer, in Ludwig, Def. Gen. Pl., ed. 3. 500. 1760. | TYPE: = Isoetes Linnaeus 1753. | |
Cephaloceraton | Cephaloceraton Gennari, Comment. Soc. Crittogam. Ital. 1: 111. 1862. | TYPE: Cephaloceraton histrix (Bory) Gennari (Isoetes histrix Bory) | |
Isoetella | Isoetella Gennari, Comment. Soc. Crittogam. Ital. 1: 114. 1862. | TYPE: Isoetella duriei (Bory) Gennari (Isoetes duriei Bory |