Isoetes lacustris L.

Isoète des lacs (fr)

Species

Pteridophytes > Isoetales > Isoetaceae > Isoetes

Characteristics

Lvs mostly 5–10(–20) cm × 0.7–2 mm, erect to often recurved, relatively coarse and firm, carrying their width well toward the acute tip, fleshy and brittle, twisted, dark green, generally lacking both stomates and peripheral strands; sporangia 3–5 mm, pale, only rarely spotted, to one-half covered by the velum; megaspores mostly 0.5–0.8 (avg >0.6) mm wide, beset with jagged crests or high ridges that may form an irregular reticulum, varying to rarely (I. hieroglyphica) with a loose reticulum of low rounded ridges or with scattered low mounds; 2n=110. Submersed (0.5–)1–3+ m in cold ponds, lakes, or streams, rooted in gravel; circumboreal, s. to N.J., Mich., Wis., Minn., and Colo.; disjunct in the mts. of Va. and Tenn. (I. macrospora)
Life form perennial
Growth form herb
Growth support aquatic
Foliage retention evergreen
Sexuality
Pollination hydrogamy
Spread hydrochory
Mature width (meter) -
Mature height (meter) 0.09 - 0.22
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Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
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Environment

Light -
Soil humidity 10-12
Soil texture -
Soil acidity -
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Hardiness (USDA) 3-6

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
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Images

Leaf

Isoetes lacustris leaf picture by Gerd Suessbier (cc-by-sa)

Distribution

Isoetes lacustris world distribution map, present in Austria, Belgium, Bulgaria, Belarus, Canada, Switzerland, Czech Republic, Germany, Denmark, Spain, Estonia, Finland, France, United Kingdom of Great Britain and Northern Ireland, Greenland, Japan, Liberia, Lithuania, Latvia, Netherlands, Norway, Poland, Romania, Saint Pierre and Miquelon, Sweden, and United States of America

Conservation status

Isoetes lacustris threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:310437-2
WFO ID wfo-0001108956
COL ID 3Q8Q4
BDTFX ID 36056
INPN ID 103843
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Isoetes lacustris Calamaria lacustris Isoetes rossica Isoetes hieroglyphica Isoetes morei Isoetes lacustris var. lacustris