what is meant by 'mixed sporangia' of pteris?
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Pteris is a homosporous fern. The sorus of Pteris is called coenosorus. Coenosori are marginal, borne continuously on a vascular commissure connected with vein ends. Thus the sporangia of Pteris form a continuous linear sorus along the margin, hence the individuality of sori is lost.
The coenosori are protected by the reflexed margin (false indusium) of the pinnae. Sori are of mixed type intermingled with many sterile hairs in between the sporangia .
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Pteris is a homosporous fern. The sorus of Pteris is called coenosorus. Coenosori are marginal, borne continuously on a vascular commissure connected with vein ends. Thus the sporangia of Pteris form a continuous linear sorus along the margin, hence the individuality of sori is lost.
The coenosori are protected by the reflexed margin (false indusium) of the pinnae. Sori are of mixed type intermingled with many sterile hairs in between the sporangia .
HOPE ITS HELP YOU
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