Aug 7, 2018 · There are three main types of sori: simplices where all sporangia mature simultaneously; gradatae where sporangia mature basipetally from distal to proximal ends; and mixtae which are a mixed aggregation of young and old sporangia.

Jul 5, 2024 · The sori, or curvature, of Japanese blades reveals their production time. Learn the different types of sori and how they are examined in sword appraisal.

Mar 22, 2025 · Fern - Spore, Sorus, Reproduction: Sori are complex aggregations of sporangia. The indusium protects the sporangial cluster. About one-third of fern species have paraphyses. The chromosome base numbers range from approximately 20 to 70. Ferns overall have relatively high levels of polyploidy, but these are all of relatively recent origin.

Sori refers to the type of curvature in a Japanese blade. The sori in a blade is found by determining the deepest point of the curve along the mune between the munemachi and the extreme tip of the kissaki (point section).

There are three types of sori based on pattern of maturation of sporangia: Simple sori, Gradate or basipetal sori and Mixed sori. Simple sori: The maturation of spores occurs at the same stage of development. Simple sori mature and develop at the same stage. Example: Gleicheniaceae, Marattiaceae. Gradate or basipetal sori:

These differences can be useful for identifying ferns. However, depending on the time of year, sori and indusia may not be useful characters because they may be too immature or too mature to be diagnostically useful. The following are some of the more common kinds of sori.

Jun 2, 2014 · Sori form a yellowish or brownish mass on the edge or underside of a fertile frond. Different ferns have different sorus patterns, the shape, arrangement, and location of sori are used in the identification of fern taxa.

Jan 30, 2023 · Sori means the curve of a katana sword. In this guide we will introduce the history of Sori, how the sori was formed during the katana making process, and different types of sori. Sori makes Katana cutting move more efficiently, and it provides aesthetic value to the sword.

There are bascially three types of sori - the one pictured above is known as Toori sori and is the most common, with the curvature deepest in the middle of the blade. A sword with the deepest point of the curvature towards the tip is 'sakisori' while one with the curvature towards the handle is called 'koshisori'.

Mar 17, 2019 · Describes three types of sori: simple, gradate, and mixed, detailing their characteristics and examples. Explains indusial protection, distinguishing between true indusium and pseudo indusium to protect sporangia. Details the positioning of sori in various ferns, highlighting different arrangements and characteristics.