Book contents
- Frontmatter
- Contents
- Preface to the first edition
- Acknowledgements
- Preface to the second edition
- Second edition acknowledgements
- Introduction
- Abbreviations
- Conspectus of classification
- Artificial key to the genera of British and Irish mosses
- Division Bryophyta
- Class 1 Sphagnopsida
- Class 2 Andreaeopsida
- Class 3 Polytrichopsida
- Class 4 Bryopsida
- Geographical relationships of British and Irish mosses
- Red List of Mosses
- British and Irish vice-counties
- English names for British and Irish mosses
- Glossary
- Bibliography
- Index
Class 3 - Polytrichopsida
Published online by Cambridge University Press: 06 August 2010
- Frontmatter
- Contents
- Preface to the first edition
- Acknowledgements
- Preface to the second edition
- Second edition acknowledgements
- Introduction
- Abbreviations
- Conspectus of classification
- Artificial key to the genera of British and Irish mosses
- Division Bryophyta
- Class 1 Sphagnopsida
- Class 2 Andreaeopsida
- Class 3 Polytrichopsida
- Class 4 Bryopsida
- Geographical relationships of British and Irish mosses
- Red List of Mosses
- British and Irish vice-counties
- English names for British and Irish mosses
- Glossary
- Bibliography
- Index
Summary
Acrocarpous. Plants frequently large, stems simple or branched, tough, with internal anatomical differentiation. Leaves often with broad costa bearing adaxial longitudinal lamellae. Setae long; capsules dehiscent; peristome nematodontous.
The peristome teeth of members of the Polytrichales are not homologous with those of members of the Bryopsida or Tetraphidales which in turn are not homologous with those of the Bryosida.
Polytrichales
Plants large, usually rhizomatous. Stems with central strand with differentiated conducting tissue. Leaves usually differentiated into sheathing base with narrow costa, and blade composed largely of expanded costa bearing longitudinal lamellae on adaxial side, lamina usually narrow, 1–2-stratose; margins toothed or entire, sometimes bordered. Capsules erect to horizontal, spherical to cylindrical, terete or 2–6-angled, hypophysis present or not; annulus absent; peristome nematodontous, with 32 or 64 teeth; columella expanded at top into membranous epiphragm joined to tips of peristome teeth; calyptrae cucullate, glabrous or hairy. A probably ancient group of one family and about 23 genera.
Polytrichaceae
For a conspectus of the genera of the Polytrichaceae see G. L. Smith, Mem. New York Bot. Gard. 21(3), 1–82, 1971. Vegetative propagules unknown but many species readily regenerating from fragments of leaves and stems.
Pogonatum P. Beauv., Mag. Encycl., 1804
Dioicous. Shoots arising from decumbent rhizome-like stems or from persistent protonemata. Leaves with broad sheathing basal part abruptly narrowed into lingulate to narrowly lanceolate blade consisting mainly of costa bearing numerous straight lamellae on adaxial side.
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- Information
- The Moss Flora of Britain and Ireland , pp. 118 - 142Publisher: Cambridge University PressPrint publication year: 2004