| 词条 | Isoetes tuckermanii |
| 释义 |
| status = | status_system = | regnum = Plantae | phylum = Lycopodiophyta | classis = Isoetopsida | ordo = Isoetales | familia = Isoetaceae | genus = Isoetes | species = I. tuckermanii | binomial = Isoetes tuckermanii | binomial_authority = 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. References1. ^{{PLANTS|id=ISTU|taxon=Isoetes tuckermanii|accessdate=26 May 2015}} {{Taxonbar|from=Q17024204}}{{Lycophyte-stub}}2. ^1 {{cite book| title=Ferns and Fern Allies of Canada| last1=Cody| first1=William| last2=Britton| first2=Donald| year=1989| publisher=Agriculture Canada}} 3 : Isoetes|Flora of Eastern Canada|Flora of the Eastern United States |
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