Lycophytes Flashcards
5 characteristics of early vascular plants
- naked stem
- epidermis with cuticle and stomata
- annularly thickened tracheids
- terminal sporangia
- equally bifurcated branching
Example of an early vascular plant
Rhynia
3 characteristics of rhynia
- possess vascular tissues to stand tall
- at the tips, homosporous sporangium exists
- perfectly bifurcates
What did lycophytes evolve from?
early vascular plants
What is enation?
similar to leaves, but not true leaves because no vascular tissue, possessed by lycophytes
What kind of sporangium do lycophytes have?
lateral sporangium, not terminal
How do vascular tissues run in lycophytes?
vascular tissues go from roots to stem, with no vascular tissues going to “leaves”
what are cones?
Densely aggregated sporangia found in lycophytes
What period were lycophytes common?
Carboniferous era
What do lycopodium look like? (2)
- true roots
- rhizomes and short upright branches
What do lycopodium microphylls look like?
small, scalelike microphylls
What kind of spores do lycopodium produce?
homosporous spores that develop into bisexual gametes
How do lycopodiums get nutrients?
some are photosynthetic, others are heterotrophic, nourished by fungi
What do selaginella look like (2?)
- long, creeping rhizomes with dichotomous branching
- roots are dichotomous as well
What do selaginella microphylls look like?
overlapping, scalelike microphylls
