Jump to content

Polysiphonia elongella

From Wikipedia, the free encyclopedia

Polysiphonia elongella
Illustration of "Polysiphonia elongella"
Illustration of Polysiphonia elongella
Scientific classification Edit this classification
Clade: Archaeplastida
Division: Rhodophyta
Class: Florideophyceae
Order: Ceramiales
Family: Rhodomelaceae
Genus: Polysiphonia
Species:
P. elongella
Binomial name
Polysiphonia elongella
Harvey

Polysiphonia elongella Harvey in W.J. Hooker [1] is a branched species of marine red algae in the genus in the Polysiphonia in the Rhodophyta.

Description

[edit]

This marine alga grows as small cylindrical thalli branching to about 10 cm long. It grows as an erect axis attached by a disk-like holdfast. The main axis is unbranched towards the base but bears lateral branches higher up. Each erect axes is composed of a polysiphonous axis with a central row of cells surrounded[2] 4 perixial cells all of the same length.[3] The branches, unlike Polysiphonia elongate, are only slightly constricted at their base.[3][4][5] Cortication filaments grow downwards in the grooves between the periaxial cells and lower down these form a complete cortication. Trichoblasts are borne near the apices.[3]

Reproduction

[edit]

Globose cystocarps and bisporangia are recorded, the tetrasporangia are sparse.[3]

Habitat

[edit]

Grows below low-water on sheltered shores.[1][6]

Distribution

[edit]

The species is recorded from Ireland, Great Britain, including the Isle of Man, the Shetland Islands and the Channel Islands.[1] The few records from Northern Ireland are old and require confirmation.[7][3] Also recorded from France and the Mediterranean.[3]

References

[edit]
  1. ^ a b c Hardy, F.G. and Guiry, M.D. 2003 A Checklist and Atlas of the Seaweeds of Britain and Ireland. The British Phycological Society. ISBN 0-9527115-16
  2. ^ Jones, E. 1962 A key to the genera of British seaweeds reprinted from Field Studies Volume 1 (4) p23
  3. ^ a b c d e f Maggs, C.A. and Hommersand, M.H. 1993. Seaweeds of the British Isles Volume 1 Rhodophyta Part 3A Ceramiales The Natural History Museum London ISBN 0-11-310045-0
  4. ^ Newton, L. 1931. A Handbook of the British Seaweeds. British Museum London
  5. ^ Harvey, W.H. 1841. A Manual of the British Algae. London
  6. ^ Morton, O. 2003 The marine macroalgae of County Donegal, Ireland. Bulletin of the Irish Biogeographical Society no.27
  7. ^ Morton, O. 1994. Marine Algae of Northern Ireland. Ulster Museum ISBN 0-900761-28-8