SWES 475/575 Class Notes – Tuesday, February 10, 2004
Green Algae III & IV– Chapter 19 & 21
Chapter 19 – Trebouxiophyceans
Phycobionts – lichen algae
Harold Bold – popularized algae as food
"Soylent Green" movie with Charleton Heston
Can be phycobiont w/ sponges
Chapter 21 – Charophyceans
Ancestor of land plants – 470 million yrs ago
Have mitotic division like land plants
desmids
lakes, ponds, ditches, streams
conjugation tubes for reproduction – fusion to zygote, gametes
Covered with mucous secreted from inside
Ecology- freshwater habitats, ubiquitous
not too conspicuous
Mainly filaments on pseudoparenchymatous
plasmodesmata – transfer nutrients (starch, lipids)
meiosis, mitosis, 8-12 haploid products
nuisance weeds – good aquatic habitat, thallus up to 2 meters
food for waterfowl, common in Central Arizona Project canals
very branched filaments
multi-celled
colorless rhizoids
antheridia (male) oogonium like land plants