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Image #   23415E
Name:   Moss spore capsule with operculum
Copyright:   Copyright 2007 Dennis Kunkel Microscopy, Inc.
Description:   Caption: Moss spore capsule with operculum (Pyrrhobryum spiniforme). Mosses commonly occur in wet moorlands and woodlands. They primarily reproduce asexually by means of spores during the sporophyte life cycle stage. Spores are produced in spore capsules that are borne on thin stalks that grow from the plant-like thallus. The sporophyte is composed of a thin stalk, called a seta, and a capsule capped by an operculum. The capsule and operculum are in turn sheathed by a calyptra. Mosses are bryophytes, or non-vascular plants. They have clearly differentiated simple stems and leaves but lack deeply lobed or segmented leaves and the absence of leaves arranged in three ranks. Mosses have a gametophyte (dominant) life cycle (the plant's cells are haploid for most of its life cycle). The sporophyte stage (the diploid body stage) is short-lived and dependent on the gametophyte. They do not have flowers or seeds, and their simple leaves cover the thin stems.
Magnification*: x30
Type: SEM
    *(Magnifications are based on a 35mm slide image of 24mm in the narrow dimension.)
Keywords:   plants moss fruiting structure Seattle SEM plant bryophyte bryophytes Bryophyta mosses asexual reproduction sporophyte sporophyte stage spore spores spore capsule sporophyte stalk stalk seta moss seta moss capsule operculum calyptra non-vascular plant non-vascular plants simple leaf simple leaves simple stem simple stems moss gametophyte gametophyte haploid diploid plant thallus thalloid thallus seed capsule seed capsules moss seed capsule moss seed capsules moss sporophyte moorland moorlands woodland woodlands wet moorland wet moorlands wet woodland wet woodlands 10.01.07 23415E moss sporangia moss sporangium Pyrrhobryum spiniforme

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