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A sorus (pl.: sori) is a cluster of sporangia (structures producing and containing spores) in ferns and fungi. A coenosorus ( pl. : coenosori ) is a compound sorus composed of multiple, fused sori. Etymology
The mature sporangia have a wall that is just a single cell thick, [8] and are typically covered with a scale called the indusium, which can cover the whole sorus, forming a ring or cup around the sorus, or can also be strongly reduced to completely absent.
The ferns (Polypodiopsida or Polypodiophyta) are a group of vascular plants (plants with xylem and phloem) that reproduce via spores and have neither seeds nor flowers.They differ from mosses by being vascular, i.e., having specialized tissues that conduct water and nutrients, and in having life cycles in which the branched sporophyte is the dominant phase.
They contain serous acini, a grouping of serous cells that secrete serous fluid, isotonic with blood plasma, that contains enzymes such as alpha-amylase. Serous glands are most common in the parotid gland and lacrimal gland but are also present in the submandibular gland and, to a far lesser extent, the sublingual gland .
The feeding form has a stiff, rounded body with cellular extensions used in feeding. Cells can transform into mobile flagellated cells with stiff tripartite hairs typical of the Stramenopiles. Cells can also grow and divide to form a cluster of cells which may become a sorus that produces biflagellated zoospores.
sorus (pl. sori) sp. (abbr. for species; pl. spp.) species. specific resistance (syn. vertical resistance) spermagonium (pl. spermagonia; syn. pycnium for rust fungi) spermatium (pl. spermatia; syn. pycniospore for rust fungi) spicule. spiroplasma – helical, motile, cell wall-less bacterium; member of genus Spiroplasma in class Mollicutes ...
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These cells lack dictyosomes, are thick-walled and thought to increase pressure within the neck of the stalk. [1] As pressure increases, the encysted cells will then come up from the apex and come together and form a large ball called the sorus. [2] The majority of the cells within the source have successfully developed into spores.