PHAEOPHYCEAE: Diversity and Systematics!
@12 Orders based on! • Thallus organization: haplostichous vs. polistichous! • Growth mode: diffuse vs. meristematic! • Sexual reproduction: Iso-, aniso- or oogamy! • Life history: Isomorphic, Heteromorphic or monophasic!
ORDER ECTOCARPALES! Thallus type: Uniseriate branched filaments! Cells with one to several band-shaped plastids with a stalked pyrenoid! Growth mode: Diffuse! Life-history type: Isomorphic!
Plurilocs!
Unilocs! ECTOCARPALES LIFE CYCLE! A. Algae crustose: Family Ralfsiaceae" 1. Ralfsia! B. Algae in tufts: Fam. Ectocarpaceae! !Ectocarpus: plastids band shape!
Ralfsia!
Ectocarpus! C. Algae ribbonlike, cylindrical and hollow or solid, or saccate: Fam. Scytosiphonaceae ! Petalonia, bladelike & solid" Scytosiphon, unbranched tubular " Hydroclathrus, perforated " Colpomenia, globose & hollow" Rosenvingea, branched cylindrical!
Petalonia! Scytosiphon! ORDER SPHACELARIALES! Family Sphacelariaceae" Thallus type: Multiseriate filaments! Sphacelaria! Growth mode: Apical cell! Sexual reproduction: " !Iso-, aniso- or oogamy! Life-history type: Isomorphic!
Epiphytic! Propagules! ORDER DICTYOTALES! Thallus type: Parenchymatic! Growth mode: Apical (single or !marginal)! Sexual reproduction: Oogamy! Life-history type: Isomorphic! Family Dictyotaceae! Dictyota, single apical cell" Dictyopteris, group of apical cells, with midrib" Padina, curled margin of apical cells!
Dictyopteris! ORDER LAMINARIALES or KELPS