Indusium is a fragile membranous construction that protects the sporangium or sorus inwards pteridophytes
Based on the origin, Indusium may last truthful or false.
True indusium:
2. Originates from the lower side of the pinnae equally an epidermal outgrowth
3. Specialized construction formed on the lower side of pinnae for protection of sorus
4. Seen inwards Dryopteris
False indusium:
In the figure, corporation red circle –false indusium originating from the margins 1. It is formed yesteryear the curving of margins of the pinnae or leaflet that protects the marginal sorus.
2. Originates from the upper side of the pinnae.
3. Formed yesteryear the curving of margins of pinnae.
4. Seen inwards Pteris, Adiantum
Based on the origin, Indusium may last truthful or false.
True indusium:
In the figure, corporation red circle – True indusium
1. Influenza A virus subtype H5N1 fragile membranous construction arises from the lower side in addition to covers the sorus of sporangia (refer figure)2. Originates from the lower side of the pinnae equally an epidermal outgrowth
3. Specialized construction formed on the lower side of pinnae for protection of sorus
4. Seen inwards Dryopteris
False indusium:
In the figure, corporation red circle –false indusium originating from the margins2. Originates from the upper side of the pinnae.
3. Formed yesteryear the curving of margins of pinnae.
4. Seen inwards Pteris, Adiantum
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