sorus

[ sawr-uhs, sohr- ]

Phonetic (Standard)IPA

noun

, plural so·ri [sawr, -ahy, sohr, -ahy].

sorus

/ ˈsɔːrəs /

sorus

/ sôr′əs /

, Plural sori sôr′ī

A cluster of sporangia borne on the underside of a fern frond. A sorus is sometimes covered by an indusium.
Also called fruitdot
A reproductive structure consisting of masses of spores, characteristic of certain fungi such as rusts and smuts.

Origin of sorus¹

1825–35; < New Latin < Greek sōrós heap

Origin of sorus¹

C19: via New Latin from Greek sōros a heap

The indusium arises from a vein to which the sorus is attached.

The sorus is circular and is covered with an indusium which is notched or kidney-shaped.

Synangium, si-nan′ji-um, n. an arterial trunk: the boat-shaped sorus of certain ferns.

Commonly the spore-cases occupy only detached spots or lines, each of which is called a Sorus, or in English merely a Fruit-dot.

In this case the sorus is always near to the margin of the leaf, and the indusium or covering is cup-shaped.

April 19, 2024tortuous

[tawr-choo-uhs ]

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