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Indusium

   Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
indusium [in′dü·zē·əm]
(anatomy)
A covering membrane such as the amnion.
(botany)
An epidermal outgrowth covering the sori in many ferns.
(mycology)
The annulus of certain fungi.
Indusium 

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.
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Megalastrum crenulans is nearly unique in the region by having a large persistent indusium (Fig.
Megalastrum (Dryopteridaceae) in Brazil, Paraguay, and Uruguay by Moran, Robbin C.; Prado, Jefferson; Labiak, Paulo H. / American Fern Journal
Indusium absent; stem diameter 1-4 mm; rachis winged throughout 2.
Pteridophytes of southeast Alabama: Dichotomous keys, illustrations ... by Woods, Michael; Diamond, Alvin R., Jr / Journal of the Alabama Academy of Science
Sporangia borne from the costa to the margin, acrostichoid sorus, without indusium.
Resurrection of the fern name Trachypteris gilliana (Baker) Svenson ... by Giacosa, J.P. Ramos; Giudice, G.E.; Morbelli, M.A. / American Fern Journal
 
 
 
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