Polyides rotunda: Difference between revisions
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{{short description|Species of alga}} |
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{{Speciesbox |
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| image = Polyides rotunda Crouan.jpg |
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| genus = Polyides |
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| species = rotunda |
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| authority = C. A. Agardh (1822) |
| authority = C. A. Agardh (1822) |
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'''''Polyides |
'''''Polyides rotunda''''' is a [[species]] of small red marine alga in the [[Family (biology)|family]] [[Polyidaceae]]. |
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==Description== |
==Description== |
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''Polyides |
''Polyides rotunda'' grows to {{convert|20|cm|abbr=on}} in length, its cartilaginous, [[terete]] and branches two or three times dichotomously. The branches are about {{convert|2|mm|abbr=on}} in diameter reaching a uniform height. The [[holdfast (biology)|holdfast]] is disc like. In colour it is purplish red.<ref name="Dixon">Dixon, P.S. and Irvine, L.M. 1977. ''Seaweeds of the British Isles Volume 1 Rhodophyta Part 1 Introduction, Nemaliales, Gigartinales'' British Museum (Natural History) {{ISBN|0-565-00781-5}}</ref><ref>Jones, W.E. 1962. A key to the genera of the British seaweeds. ''Field Studies'' '''1''' (4) pp1 - 32</ref> |
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==Habitat== |
==Habitat== |
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Generally [[Lithophyte|epilithic]] in rock pools in the [[littoral]] and upper sublittoral.<ref name="Dixon"/> |
Generally [[Lithophyte|epilithic]] in rock pools in the [[littoral]] and upper sublittoral.<ref name="Dixon"/> Sand tolerant.<ref>Lewis, J.R. 1964 ''The Ecology of Rocky Shores.'' The English Universities Press Ltd.</ref> |
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==Distribution== |
==Distribution== |
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==Reproduction== |
==Reproduction== |
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''Polyides |
''Polyides rotunda'' is [[Dioecy|dioecious]]. The [[Gametangium#Male|spermatangial]] cells develop in swollen areas near the apices. [[Cystocarp]]s develop near the apices.<ref name="Dixon"/> The [[Red algae#Life cycle|tetrasporangia]] are cruciate, that is cross-shaped.<ref>Newton,L. 1931 ''A Handbook of the British Seaweeds''. British Museum (Natural History)</ref> |
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==Similar species== |
==Similar species== |
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{{Taxonbar|from=Q21060641}} |
{{Taxonbar|from=Q21060641}} |
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[[Category: |
[[Category:Gigartinales]] |
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[[Category:Red algae genera]] |
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[[Category:Taxa described in 1822]] |
[[Category:Taxa described in 1822]] |
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Latest revision as of 12:41, 29 September 2022
| Polyides rotunda | |
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Scientific classification 
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| (unranked): | Archaeplastida |
| Division: | Rhodophyta |
| Class: | Florideophyceae |
| Order: | Gigartinales |
| Family: | Polyidaceae |
| Genus: | Polyides |
| Species: | P. rotunda
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| Binomial name | |
| Polyides rotunda C. A. Agardh (1822)
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Polyides rotunda is a species of small red marine alga in the family Polyidaceae.
Description[edit]
Polyides rotunda grows to 20 cm (7.9 in) in length, its cartilaginous, terete and branches two or three times dichotomously. The branches are about 2 mm (0.079 in) in diameter reaching a uniform height. The holdfast is disc like. In colour it is purplish red.[1][2]
Habitat[edit]
Generally epilithic in rock pools in the littoral and upper sublittoral.[1] Sand tolerant.[3]
Distribution[edit]
Generally distributed around Ireland, Great Britain, the Isle of Man and the Channel Islands.[4]
Reproduction[edit]
Polyides rotunda is dioecious. The spermatangial cells develop in swollen areas near the apices. Cystocarps develop near the apices.[1] The tetrasporangia are cruciate, that is cross-shaped.[5]
Similar species[edit]
Furcellaria lumbricalis (Hudson) Lamouroux is very similar but can be distinguished by the holdfast which has claw-like branches while that of Polyides being disc-like.[6]
References[edit]
- ^ a b c Dixon, P.S. and Irvine, L.M. 1977. Seaweeds of the British Isles Volume 1 Rhodophyta Part 1 Introduction, Nemaliales, Gigartinales British Museum (Natural History) ISBN 0-565-00781-5
- ^ Jones, W.E. 1962. A key to the genera of the British seaweeds. Field Studies 1 (4) pp1 - 32
- ^ Lewis, J.R. 1964 The Ecology of Rocky Shores. The English Universities Press Ltd.
- ^ Bunkern F.StP, D., Brodie, J.A., Maggs, C.A. and Bunker, Ann. R.2017. Seaweeds of Britain and Ireland. Second Edition. Wild Nature Press, Plymouth.UK.ISBN 978-0-9955673-3-7
- ^ Newton,L. 1931 A Handbook of the British Seaweeds. British Museum (Natural History)
- ^ Jones, E.W. 1962. A key to the genera of the British seaweeds. Field Studies volume 1 no 4.pp1 - 32