Isoetes tuckermanii
Isoetes tuckermanii, or Tuckerman's quillwort,[1] is a tetraploid species of plant in the family Isoetaceae. It can be found in shallow water in Newfoundland, Nova Scotia, New Brunswick, and south through the New England states to Maryland.[2] It bears 10 to 45 long bright green to yellow green leaves that are 4 to 25 centimeters long, usually erect, but sometimes recurved. The velum covers one fourth or less of the sporangium, which is usually unspotted, 5 millimeters long, and 3 millimeters wide. The white spherical megaspores are 400 to 650 micrometers in diameter, and bear rough-crested ridges that form a hexagonal honeycomb shape. The kidney shaped microspores are 24 to 33 micrometers long, bearing tubercles.[2] It is very similar to I. macrospora, only reliably distinguishable by cytology or through careful megaspore measurement.
| Isoetes tuckermanii | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Lycophytes |
| Class: | Lycopodiopsida |
| Order: | Isoetales |
| Family: | Isoetaceae |
| Genus: | Isoetes |
| Species: | I. tuckermanii |
| Binomial name | |
| Isoetes tuckermanii A.Br. | |
References
- "Isoetes tuckermanii". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 26 May 2015.
- Cody, William; Britton, Donald (1989). Ferns and Fern Allies of Canada. Agriculture Canada.