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
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Lycophytes
Class:	Lycopodiopsida
Order:	Isoetales
Family:	Isoetaceae
Genus:	Isoetes
Species:	I. tuckermanii
Binomial name
Isoetes tuckermanii A.Braun ex Engelm.[2][3]
Synonyms[2]
Calamaria tuckermanii (A.Braun ex Engelm.) Kuntze Isoetes tuckermanii var. borealis A.A.Eaton