Isoëtes maritima

L. Underwood

Bot. Gaz. 13: 94. 1888..

Common names: Maritime quillwort
Synonyms: Isoëtes beringgensis Komarov Isoëtes echinospora subsp. maritima (L. Underwood) A. Löve Isoëtes echinospora var. maritima (L. Underwood) A. A. Eaton Isoëtes macounii
Treatment appears in FNA Volume 2.

Plant usually aquatic, occasionally emergent. Rootstock nearly globose, 2-lobed. Leaves ± deciduous, bright green, pale toward base, spirally arranged, to 12 cm, pliant, gradually tapering toward tip. Velum covering less than 1/2 of sporangium. Sporangium wall ± brown-streaked. Megaspores whtie, 380–600 μm diam., echinate to short-cristate with stout blunt spines and crests; girdle densely echinate. Microspores gray to brown in mass, 30–40 μm, papillose. 2n = 44.


Phenology: Spores mature late summer.
Habitat: Lakes and streams

Discussion

Isoëtes maritima hybridizes with I. echinospora and I. occidentalis [ = I. truncata (A. A. Eaton) Clute].

Selected References

None.

Lower Taxa

None.
... more about "Isoëtes maritima"
several +  and 1 +
W. Carl Taylor +, Neil T. Luebke +, Donald M. Britton +, R. James Hickey +  and Daniel F. Brunton +
L. Underwood +
Maritime quillwort +
alternating +
B.C. +, Alaska +  and Wash. +
Lakes and streams +
pale +  and bright green +
straight +
deciduous +
recurved;erect;spreading +
tapering +
0 cm0 mm <br />0 m <br /> (12 cm120 mm <br />0.12 m <br />) +
deltate;cordiform +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
membranous +
short-cristate +
gray +  and brown +
Spores mature late summer. +
branched +  and simple +
2-lobed +  and globose +
0.3 cm3 mm <br />0.003 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Isoëtes beringgensis +, Isoëtes echinospora subsp. maritima +, Isoëtes echinospora var. maritima +  and Isoëtes macounii +
Isoëtes maritima +
Isoëtes +
species +
brown-streaked;completely brown +
ephemeral +, evergreen +  and perennial +