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A sorus (pl. ''sori'') is a cluster of sporangia (structures producing and containing spores) in ferns and fungi. This New Latin word is from Ancient Greek σωρός (''sōrós'' ‘stack, pile, heap’). In fungi and lichens, the sorus is surrounded by an external layer. In some red algae it may take the form of a depression into the thallus. In ferns, these form a yellowish or brownish mass on the edge or underside of a fertile frond. In some species, they are protected during development by a scale or film of tissue called the indusium, which forms an umbrella-like cover. Sori occur on the sporophyte generation, the sporangia within producing haploid meiospores. As the sporongia mature, the indusium shrivels so that spore release is unimpeded. The sporangia then burst and release the spores. The shape, arrangement, and location of the sori are often valuable clues in the identification of fern taxa. Sori may be circular or linear. They may be arranged in rows, either parallel or oblique to the costa, or randomly. Their location may be marginal or set away from the margin on the frond lamina. The presence or absence of indusium is also used to identify fern taxa. == Gallery == Image:Scattered-sori.jpg|Scattered sori Image:Linear sori.jpg|Linear sori Image:Dense sori.jpg|Sori covering a frond's entire underside Image:Immature sorus.jpg|Fern sorus with immature sporangia Image:Round sori.jpg|Circular sori with mature sporangia Image:Rumohra adiantiformis sori 01.jpg|Sori with indusia at different stages of development. File:Triphragmium ulmariae, Meadowsweet Rust.jpg|Fungal sori of the Meadowsweet Rust gall. File:Large Sori (fern).JPG|Large sori File:Polypodium vulgare, sores (Matthieu Gauvain).JPG|''Polypodium vulgare'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sorus」の詳細全文を読む スポンサード リンク
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