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Desmarestiales is an order in the brown algae (Phaeophyceae). Members of this order have terete or ligulate (flat) pinnately branched thalli attached by discoid holdfasts.They have a sporophytic thallus usually aggregated to form a pseudo-parenchyma. [1]
A kelp, for example, may have its thallus divided into three regions. The parts of a kelp thallus include the holdfast (anchor), stipe (supports the blades) and the blades (for photosynthesis). [2] The thallus of a fungus is usually called a mycelium. The term thallus is also commonly used to refer to the vegetative body of a lichen.
Siphonocladus tropicus showing segregative cell division. Siphonocladus is a small genus of green algae in the family Siphonocladaceae. [1] [2] The algal body is composed of long, club-shaped cells that divide by segregative cell division, followed by the formation of branches that break through the mother cell.
Caulerpa is coenocytic, meaning it has a multinucleate thallus organization. It is also siphonous, meaning unlike other algae, the thallus and the nuclei are not separated by cell walls. They are instead one long mass of protoplasm surrounded by a single cell wall. [12]
Ectocarpus is a genus of filamentous brown alga that includes a model organism for the genomics of multicellularity. [1] [2] Among possible model organisms in the brown algae, Ectocarpus was selected for the relatively small size of its mature thallus and the speed with which it completes its life cycle.
Male conceptacles tend not to sit as deep within the thallus as female conceptacles; their size is similar although their shape tends to differ. [8] Cells within circular regions within the perithallus lengthen to form sexual conceptacles, [ 8 ] leaving long, wefty cells around the walls of the conceptacle. [ 14 ]
Brown algae have many unique characteristics in terms of their metabolism and cell biology. Ergo, brown algae and in particular, E. siliculosus, are often used for explorative research. Its genome was the first brown macroalgal genome to be sequenced, with the expectation that E. siliculosus will serve as a genetic and genomic model for brown ...
It attaches to the ground and has a thallus which grows in a fan shape, hence its nickname—mermaid's fan algae. The algae attaches to sand or mud with a system of rhizoids, root-like structures that form a hold fast. [3] It lacks a stem, leaves, roots and a vascular system, but does have a stem-like feature called a stipe. The thallus is ...