New Latin sōrusfrom Greek sōrosheapteuə- in Indo-European roots
American Heritage Dictionary of the English Language, 5th Edition
Sorus Sentence Examples
The sorus is frequently protected by an outgrowth from the surface or margin of the leaf called the indusium.
Among the simplest cases are the sheet-like aggregates of sporogenous hyphae in Puccinia, Uromyces, &c., or of basidia in Exobasidium, Corticium, &c., or of asci in Exoascus, Ascocorticium, &c. In the former, where the layer is small, it is often termed a sorus, but where, as in the latter, the sporogenous layer is extensive, and spread out more or less sheet-like on the supporting tissues, it is more frequently termed a hymenium.
The form of the sorus and the structure of the sporangium are of great systematic importance.
The sporangia arise simultaneously in the sorus, which is borne on the under surface of the ordinary pinna; in those species with large sporangia the latter form a single circle, in others sporangia may also arise from the central part of the receptacle.
The sorus has a somewhat elongated receptacle, on which the sporangia arise basipetally; the indusium may be cup-shaped, bivalve or wanting.