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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]
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.
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.
Some conceptacles form by the centripetal expansion of a hole near the thallus surface; in such cases, a roof forms by nearby filaments arching over and establishing themselves as short (often 1–9 cells long) [10] [11] filaments that cover the chamber, leaving a central pore through which the spores can escape. [12]
Pinnularia is a predominantly fresh-water algae usually found in ponds and moist soil. [2] They can also be found in springs, estuaries , sediments , and oceans. Members of this genus are most commonly found in 40 cm (16 in) of water, at 5 °C (41 °F).
Desmarestiales Desmarestia aculeata Scientific classification Domain: Eukaryota Clade: Diaphoretickes Clade: SAR Clade: Stramenopiles Phylum: Gyrista Subphylum: Ochrophytina Class: Phaeophyceae Subclass: Fucophycidae Order: Desmarestiales Setchell & Gardner Families Arthrocladiaceae Desmarestiaceae Desmarestiales is an order in the brown algae (Phaeophyceae). Members of this order have terete ...
A byssoid lichen has a wispy, cottony or teased wool appearance due to the loosely woven hyphae in its thallus. [13] It has no outer cortex. [14] Lichens with this growth type can be split into two types. In one type, the thallus is dominated by fungal hyphae, with a photobiont – typically a coccoid green alga – sprinkled throughout. In the ...
Several kelp laminae. The lamina or blade in macroscopic algae, like seaweed, is a generally flattened structure that typically forms the principal bulk of the thallus. [1] It is often developed into specialised organs such as flotation bladders and reproductive organs.