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Hildenbrandtia
''Hildenbrandia'' is a genus of thalloid red alga comprising about 26 species. The slow-growing, non-mineralized thalli take a crustose form. ''Hildenbrandia'' reproduces by means of conceptacles and produces tetraspores. Morphology ''Hildenbrandia'' cells are around 3–5 μm in diameter and the filaments are around 50–75 μm in height. The thallus comprises two layers: the hypothallus, which attaches to the rock, and the perithallus, a pseudoparenchymous layer comprising vertical filaments, which unlike coralline red algae is not further differentiated. Growth ''Hildenbrandia'' comprises orderly layers of vertical oblong cells with thick vegetative cell walls, occasionally connected by secondary pit connections with pit plugs in the septal pores. It grows at its margins, away from the centre, and is able to quickly repair any gaps arising by regenerating from a basal layer of cells. As plants become more mature, they become multi-layered and strongl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hildenbrandia Rivularis
''Hildenbrandia rivularis'' is a species of freshwater red algae. It forms red, crusty Thallus, thalli on stones submerged in water, typically in streams and rivers, less commonly in lakes and brackish parts of seas. It occurs in scattered locations on almost all continents. The species was formerly considered an indicator of clean or slightly polluted waters. The scientific genus name is sometimes spelled in various orthographic variants, especially as ''Hildenbrandtia''. The Biological life cycle, life cycle of this species was described by the Polish hydrobiologist . Structure Habit The thallus is in the form of a flat crust closely adhering to the rocky substrate, giving it the appearance of a coating. It grows radially, assuming a rounded, disc-like shape. It is composed of Cell (biology), cells arranged in tightly fused vertical rows, with weakly branching. The lower layer of the thallus adheres to the substrate, without forming rhizoids. The upper layer of the thallus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
