Isoetes tuckermanii
| Isoetes tuckermanii | |
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| Species: | I. tuckermanii
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| Isoetes tuckermanii A. Br.
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Isoetes tuckermanii (Tuckerman's quillwort)[1] is a tetraploid species of quillwort in the Isoetaceae family. 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.
References
- ^ USDA, NRCS (n.d.). "Isoetes tuckermanii". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 26 May 2015.
- ^ a b Cody, William; Britton, Donald (1989). Ferns and Fern Allies of Canada. Agriculture Canada.