Definitions for sorusˈsɔr əs, ˈsoʊr-; ˈsɔr aɪ, ˈsoʊr aɪ
This page provides all possible meanings and translations of the word sorus
Random House Webster's College Dictionary
so•rusˈsɔr əs, ˈsoʊr-; ˈsɔr aɪ, ˈsoʊr aɪ(n.)(pl.)so•ri
one of the clusters of sporangia on the back of the fronds of ferns.
a similar spore mass in certain fungi and lichens.
Origin of sorus:
1825–35; < NL < Gk sōrós heap
a spore-producing structure in certain lichens and fungi
cluster of sporangia usually on underside of a fern frond
Any reproductive structure, in some lichens and fungi that produces spores
A cluster of sporangia on the edge or underside of a fern frond
one of the fruit dots, or small clusters of sporangia, on the back of the fronds of ferns
A sorus is a cluster of sporangia. 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.
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