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Discovering Bryophytes: The Oldest Land Plants

Explore the world of bryophytes, the oldest land plants that have been preserved to the present day. Learn about their structure, life cycle, importance, and occurrence all over the Earth. Delve into the unique characteristics of mosses and liverworts with detailed explanations and illustrations.

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Discovering Bryophytes: The Oldest Land Plants

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  1. BRYOPHYTES (Mosses) Výukový materiál OR 03 - 82 Tvůrce: Mgr. Alena Výborná Tvůrce anglické verze: ThMgr. Ing. Jiří Foller Projekt: S anglickým jazykem do dalších předmětů Registrační číslo: CZ.1.07/1.1.36/03.0005 Tento projekt je spolufinancován ESF a SR ČR

  2. BRYOPHYTES • the oldest land plants • they have been preserved to the present day • the oldest resembled today's liverworts • they do not have a conductive tissue • they do not grow up to great heights • absence of conducting and supporting tissues • they are divided on mosses and liverworts

  3. BRYOPHYTES – structure of a moss plant • small stalk • leaf • attaching threads (attached to a substrate, it leads partially nutrients and water) • after fertilization, bristle with a capsule is developing • the capsule is closed with a lid - spores

  4. BRYOPHYTES – structure of a moss plant

  5. BRYOPHYTES - liverworts • LAMELLAR • flat • bowed • grown firmly to the substrate • FOLIATE • two rows of sessile leaves disposed • on the stem in one plane

  6. BRYOPHYTES - liverworts

  7. BRYOPHYTES – life cycle

  8. BRYOPHYTES– life cycle

  9. BRYOPHYTES– life cycle • spore germinates in moist environment • from the spore is created richly branched protonema • from the protonema of moss plant • there are on it: • gametangia (egg cells) • female antheridia • humidity is important for fertilization • from the fertilized egg cell grows bristle and capsule

  10. BRYOPHYTES – occurrence • all over the Earth • part of communities of higher plants • they predominate in the northern areas • they colonize places inhospitable for higher plants

  11. BRYOPHYTES– importance • they quickly colonize the newly exposed soil • it prevents soil erosion • they are involved in the formation of humus • they keep water • they contribute to the maintenance of the landscape and higher humidity in the meadows and the woods • indicator of air pollution

  12. REVISION: • 1) What is the importance of bryophytes? • 2) Describe the picture. • 3) Where the mosses occur? • 4) Describe the metagenesis of bryophytes. • 5) Liverwort include……..

  13. Source of texts and pictures : • DOBRORUKA, Luděk J. Přírodopis pro 7. ročník základní školy. 1. vyd. Praha: Scientia, 1998, 152 s. ISBN 80-718-3134-4

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