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Isoetes howellii
North American species of quillwort From Wikipedia, the free encyclopedia
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Isoetes howellii, or Howell's quillwort, is a species of quillwort, a type of lycophyte. It is an aquatic plant native to North America.
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Distribution
Isotes howelii is found in western North America and grows in wet habitats such as vernal pools.
Description
It produces 5 to 28 pointed, cylindrical, bright green leaves that can reach 30 centimeters in length. The velum covers roughly one third of the spherical sporangia, which is 6 millimeters long. The ligule is in the shape of an elongated triangle. The megaspores are 420 to 610 micrometers in diameter. The coarse microspores are 25 to 30 micrometers long.[1] It is closely related to I. melanopoda and was first thought to be a variation of that species.
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References
External links
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