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The thallus (tissue) consists of fine branched filaments each with a central axial filament supporting pericentral cells. [7] The number of these pericentral cells (4–24) is used in identification. [8] [9] [10] Polysiphonia elongata [11] shows a central axial cell with 4 periaxial cells with cortical cells growing over the outside on the ...
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.
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 ...
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.
In a classification presented by van den Hoek, Mann and Jahns (1995), based on the level of organization of the thallus, there are seven orders: Order Chloramoebales (e.g., Chloromeson) - flagellate organisms; Order Rhizochloridales (e.g., Rhizochloris, Myxochloris) - ameboid organisms
The thallus is perennial with an irregular or disc-shaped holdfast or with haptera. [1] The erect portion of the thallus is dichotomous or subpinnately branched, flattened and with a distinct midrib. Gas-filled pneumatocysts (air-vesicles) are present in pairs in some species, one on either side of the midrib.
The size of the lichen body, or thallus, usually ranges from a few millimetres to about 10 cm (4 in) in diameter. [6] Typical thallus colours are greenish, brownish, grey, or black. [37] The medulla is the internal layer of fungal hyphae below the cortex and the algal layer; three types occur in the Verrucariaceae.
There are many long rhizoids on the underside of the thallus but no ventral scales. [4] Pellia epiphylla is monoicous, with both male and female sex organs on the same thallus. The small male organs are scattered along the midrib while the female organs grow near the tip of the thallus and are surrounded by a flap. [3]