Isoetes tuckermanii
Isoetes tuckermanii | |
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Scientific classification | |
Kingdom: | Plantae |
Phylum: | Lycopodiophyta |
Class: | Isoetopsida |
Order: | Isoetales |
Family: | Isoetaceae |
Genus: | Isoetes |
Species: | I. tuckermanii |
Binomial name | |
Isoetes tuckermanii A. Br. | |
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
- ↑ "Isoetes tuckermanii". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 26 May 2015.
- 1 2 Cody, William; Britton, Donald (1989). Ferns and Fern Allies of Canada. Agriculture Canada.