What are phaephyceae? (3)
-Like diatoms, chryosphyta, and synurophyta they are members of division Chromophyta
-Brown algae (like kelp!)
-Most are marine species that live attached to rocks or other substrate
General morphology (3)
-ONLY FILAMENTOUS! No unicellular or colonial forms
-advanced forms either have very densely packed cells (parenchymatous) or tightly woven filaments (pseudoparenchymatous) while more simple forms are just branching filaments
-most advanced forms differentiated cells
Differentiated cells (2)
-Cortex: Outer layers of photosynthetic cells
-medulla: inner layers of non-pigmented cells used for storage and transport
parenchymatous from components (4)
picture Kelp
-Blade: the leaf-like structure that is shed each year (deciduous)
-Stipe: stem-like region of the thallus
-holdfast: modified base region used to attach to substrate
-pnematocysts (air bladders): expanded areas of the thallus that contain gas used for buoyancy
Thallus growth strats (2)
-Diffuse: cells produced throughout the thallus
-Meristematic: new cells produced in the meristem
Meristem (3)
-site of active cell division where cells are used for growth repair etc.
-Meristematic cells are like stem cells for plants and algae
-Meristem locations all have different names
Meristem locations (4)
-Apical: end/tips of branches
-intercalary: within branches
-Thrichothallic: base of filaments or hairs
-meristodermal: on the surface of the thallus (increases GIRTH)
