Isoetes tuckermanii

Isoetes tuckermanii, or Tuckerman's quillwort,[4] is a tetraploid species of plant in the family Isoetaceae.[2] It can be found in shallow water in Newfoundland, Nova Scotia, New Brunswick, and south through the New England states to Maryland.[5] 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.[5] 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
Synonyms[2]

Calamaria tuckermanii (A.Braun ex Engelm.) Kuntze
Isoetes tuckermanii var. borealis A.A.Eaton

References
  1. Maiz-Tome, L. (2016). "Isoetes tuckermanii". IUCN Red List of Threatened Species. 2016: e.T64315234A67729801. doi:10.2305/IUCN.UK.2016-1.RLTS.T64315234A67729801.en. Retrieved September 26, 2020.
  2. "Isoetes tuckermanii A.Braun ex Engelm". Plants of the World Online. The Trustees of the Royal Botanic Gardens, Kew. n.d. Retrieved September 26, 2020.
  3. "Isoetes tuckermanii A. Braun ex Engelm". World Flora Online. The World Flora Online Consortium. n.d. Retrieved September 26, 2020.
  4. "Isoetes tuckermanii". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 26 May 2015.
  5. Cody, William; Britton, Donald (1989). Ferns and Fern Allies of Canada. Agriculture Canada.


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.