BRYOPHYTES - g) Antheridia found on terminal shoots,...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
BRYOPHYTES A.Liverworts, Hornworts, and Mosses B.Generally lack vascular tissue 1. No true roots, stems or leaves but functionally similar structures 2. Some mosses do have rudimentary form of xylem and phloem C.Small less than 20 cm D.Gametophyte dominates life cycle and is free living 1. Often mycorrhizal 2. Usually perennial 3. Multicellular gametangia surrounded by protective, sterile sheath cells. a) Antheridia produce biflagellated sperm b) Archegonia produce a single egg 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
E. Sporophyte is short lived and dependent on gametophyte 1. Grows out of archegonia 2. Produces a terminal sporangium 3. Spores have cutinized coat 4. Spores dispersed by wind F. Bryophytes need water for sexual reproduction (Like amphibians) DIVERSITY OF BRYOPHYTES I. MOSSES A.Features 1. Gametophytes a) Radially symmetrical b) “leaves” usually with a midrib c) Leaves one cell thick thus no mesophyll, no stomata, no petiole d) Rhizoids are multicellular e) Most are unisexual f) Archegonia form on end of shoot and have one egg
Background image of page 2
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: g) Antheridia found on terminal shoots, produce many flagellated sperm h) Some species actually have conducting tissues 2. Sporophytes a) Begins with formation of zygote b) Mature sporophyte has three parts (1) Foot - absorbs water, minerals, and food (2) Seta - raises the capsule (3) Capsule - sporangium may have stomata c) Haploid spores grow into gametophyte 3. See life cycle on page 667. 2 II. LIVERWORTS ( Marchantia is really atypical) A.Features 1. Rhizoids are unicellular 2. Gemetophytes usually bilaterally symmetrical 3. Lack a midrib 4. Have pore on upper surface of thallose 5. Sporangia are unstalked 6. Asexual reproduction via gemmae 7. Many are unisexual a) Archegonia form on underside of umbrella-shaped structures called archegoniophors b) Antheridia form on upper surface of disk-shaped cap called antheridiophores 8. See life cycle on page 675 3...
View Full Document

This note was uploaded on 12/25/2011 for the course BOTANY 206 taught by Professor Wood during the Fall '09 term at Broward College.

Page1 / 3

BRYOPHYTES - g) Antheridia found on terminal shoots,...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online