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A covering membrane such as the amnion.
An epidermal outgrowth covering the sori in many ferns.
The annulus of certain fungi.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
a small process on the leaf surface of ferns that covers the clusters of sporangia (sori). Indusia develop mainly from the leaf epidermis, from the placenta (on which the sporangia sit), or from the curled edge of the leaf.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.