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Spiny Spored Quillwort

Isoetes echinospora Dur.

Comments

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North American plants of Isoëtes echinospora, which bear stomata, have been called I. muricata or I. echinospora var. braunii to distinguish them from European plants of I. echinospora, which do not have stomata.

Isoëtes echinospora is a distinct species but has considerable variation, especially in size, color, and form of leaves. It is the most commonly encountered quillwort in oligotrophic, noncalcareous lakes and ponds of northeastern North America.

Isoëtes echinospora hybridizes with I. bolanderi; I. engelmannii [ = I. x eatonii Dodge (later synonym = I. x gravesii A. A. Eaton)]; I. lacustris [ = I. x hickeyi Taylor & Luebke]; I. maritima; I. riparia [ = I. x dodgei A. A. Eaton]; and I. tuckermanii.

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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Flora of North America @ eFloras.org
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Flora of North America Editorial Committee
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Description

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Plants usually aquatic, occasionally emergent. Rootstock nearly globose, 2-lobed. Leaves ± deciduous, bright green to reddish green, pale toward base, spirally arranged, to 25(--40) cm, pliant, gradually tapering toward tip. Velum covering less than 1/2 of sporangium. Sporangium wall ± brown-streaked. Megaspores white, 400--550 μm diam., echinate with thin, sharp spines; girdle obscure. Microspores gray to light brown in mass, 20--30 μm, smooth to spinulose. 2n = 22.
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
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eFloras

Habitat & Distribution

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Spores mature in late summer. Emergent or in shallow, cool, oligotrophic water of slightly acidic lakes, ponds, and streams; Greenland; Alta., B.C. Man., N.B., Nfld., N.W.T., N.S., Ont., P.E.I., Que., Sask., Yukon; Alaska, Calif., Colo., Conn., Idaho, Maine, Mass., Mich., Minn., Mont., N.H., N.J., N.Y., Ohio, Oreg., Pa., R.I., Utah, Vt., Wash., Wis.; circumboreal.
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
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eFloras

Synonym

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Isoëtes braunii Durieu; I. echinospospora subsp. muricata (Durieu) A. Löve & D. Löve; I. echinospora var. boottii Engelmann; I. echinospora var. braunii (Durieu) Engelmann; I. echinospora var. muricata (Durieu) Engelmann; I. muricata Durieu; Isoëtes setacea Lamarck subsp. muricata (Durieu) Holub
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cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
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eFloras

Isoetes echinospora

provided by wikipedia EN

Isoetes echinospora, also known as spiny quillwort,[1] spiny-spored quillwort[2] or spring quillwort[3] is a species of quillwort in the Isoetaceae family, and is the most abundant species in Canada.[4] It can be found in shallow aquatic environments from Labrador and Newfoundland to Alaska, and south to Pennsylvania, Wisconsin, Colorado, and California. In Germany it is found in only two locations: the Feldsee and Lake Titisee, both in the High Black Forest.[5]

It bears 10–30 green to yellow leaves and a two-lobed corm. The velum covers one to three quarters of the sporangium, which are 10 millimetres (0.39 in) long. Round white megaspores are about 480 micrometres (0.019 in) in diameter and are covered with spines. Kidney-shaped microspores are about 26 micrometres (0.0010 in) long with smooth, fine spines.[4] European populations of the plant lack the stomata present in North American populations.

Isoetes muricata and Isoetes echinospora var. braunii refer to the North American plants, but are often considered synonyms of Europe's I. exhinospora.[2]

References

  1. ^ "Spiny Quillwort". West Highland Flora. Retrieved 2015-08-26.
  2. ^ a b "Isoetes echinospora", Flora of North America
  3. ^ "Isoetes echinospora". Online Atlas of the British and Irish Flora. Retrieved 2015-08-26.
  4. ^ a b Cody, William; Britton, Donald (1989). Ferns and Fern Allies of Canada. Agriculture Canada.
  5. ^ Information Board at the Feldsee. Recorded on 26 Aug 2015.
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Isoetes echinospora: Brief Summary

provided by wikipedia EN

Isoetes echinospora, also known as spiny quillwort, spiny-spored quillwort or spring quillwort is a species of quillwort in the Isoetaceae family, and is the most abundant species in Canada. It can be found in shallow aquatic environments from Labrador and Newfoundland to Alaska, and south to Pennsylvania, Wisconsin, Colorado, and California. In Germany it is found in only two locations: the Feldsee and Lake Titisee, both in the High Black Forest.

It bears 10–30 green to yellow leaves and a two-lobed corm. The velum covers one to three quarters of the sporangium, which are 10 millimetres (0.39 in) long. Round white megaspores are about 480 micrometres (0.019 in) in diameter and are covered with spines. Kidney-shaped microspores are about 26 micrometres (0.0010 in) long with smooth, fine spines. European populations of the plant lack the stomata present in North American populations.

Isoetes muricata and Isoetes echinospora var. braunii refer to the North American plants, but are often considered synonyms of Europe's I. exhinospora.

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