BryophytesMini-Lab #1

Mini Lab Activity #1• Three Slides Capsule (sporangia) CS

Gametangia (antheridia, archegonia) CSProtonemia CS

One Sample - Moss sample (draw on back) DS

• Need TWO more Circle on the BACK-use petri dishes• Draw The Entire field of vision• Use digital camera, cell phone, etc for future• Be sure to write a title above each circle indicating what the sample

is. Look at the slide label• Magnification must be written below your drawing• Include the following labels in your drawings:

– Sample (sporophyte & gametophyte, seta, capsule, calyptera, annulus, operculum, peristome.

– Protonema: spore & filamentous cells– Gametangia: antheridia (sperm) or archegonia (egg)– Capsule: annulus, peristome, spores (use the chart posted)

Life Cycle of Bryophyta (pg. 581)

Bryophytes “Non-Vascular plants”• Evolved over 450-500 mya• Over 15,000 species• Includes: Liverworts (Hepatophyta)

Hornworts (Anthocerophyta)Mosses (Bryophyta)Peat Moss (Sphagnum)

• Grow very small: No lignin (short stature)

• Exists close to the water’s edge• No vascular tissue• Gametophyte generation is dominant (haploid)• Sperm is flagellated (must swim to the female)• Reproductive structures form in these gametangia:

Male: antheridium Female: archegonium

Key Structures to know for the Moss (pgs. 580-581)• Protonema: filament of highly branched cells

– developed from a germinated spore– large surface area for absorbing water

• Rhizoids: long, tubular cells that anchor the plant– not considered roots (lack vascular,conductive cells)– Most of it doesn’t absorb water or nutrients

• Sporophyte: Foot, seta (stalk), annulus, and capsule• Calyptera: protective cap over the operculum & annulus• Peristome: tooth-like structure that gradually releases the spores from the

capsule. (50 million per capsule)• Specific Genus Examples: (see pg. 582)

– Sphagnum (peat mosses)– Marchantia (liverworts)– Anthoceros (hornwort)

Antheridia & Archegonia(Gametangia)

Protonema Filaments (germinated spores)

Capsule & Spores