Isoetes occidentalis, the western quillwort,[2] is a species of quillwort in the family Isoetaceae. It can be found in aquatic habitats of coastal Alaska and British Columbia south to California and Colorado. It is frequently found on Vancouver Island and around the Fraser Valley region.[3] It bears 10 to 30 or more rigid, dark green leaves, each 5 to 20 centimeters long. The velum covers one fourth to one third of the orbicular sporangium, which is 5 to 6 millimeters in diameter. The ligule is shaped like a shortened triangle. The white megaspores are 500 to 700 micrometers in diameter and bear sharp ridges and crests. The microspores are 36 to 43 micrometers long.[3] Though the leaves seem to bear resemblance to those of I. lacustris, especially the occasionally occurring reddish base, I. occidentalis is a hexaploid and I. lacustris is a decaploid.
^"NatureServe Explorer 2.0".
^USDA, NRCS (n.d.). "Isoetes occidentalis". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 26 May 2015.
^ abCody, William; Britton, Donald (1989). Ferns and Fern Allies of Canada. Agriculture Canada. ISBN 9780660131023.
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Isoetesoccidentalis, the western quillwort, is a species of quillwort in the family Isoetaceae. It can be found in aquatic habitats of coastal Alaska...
timing of the origin of modern Isoetes is subject to considerable uncertainty. The name of the genus may also be spelled Isoëtes. The diaeresis (two dots over...
float on the surface of water, with members of the group found worldwide. Isoetes is a cosmopolitan genus of lycophyte known as the quillworts. Juncus is...
strigosa Botrychium simplex and Ophioglossum polyphyllum the squillworts Isoetes boryana and I. malinverniana Monocots Alismataceae: Caldesia parnassifolia...
Notes Isoetes bilaspurensis Isoetaceae R Madhya Pradesh Isoetes dixitii Isoetaceae Ex Panchghani Isoetes sampathkumarnii Isoetaceae Ex KA Isoetes divyadarshanii...
†Ischyromys typus †Ischyromys veterior – type locality for species Isoetes †Isoetes trullata – type locality for species †Isoetites †Isoetites horridus...
†Ischyrhiza – or unidentified comparable form †Ischyrhiza avonicola †Ischyromys Isoetes Juglans †Juglans regia – or unidentified comparable form Juniperus †Kerria...
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