- more or less alveolated surface due to adventitious,
erect, hard, more or less anastomosed lamellae;
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- erect (often entire), sometimes thorny margin;
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- uniporate, slightly raised (hemispherical)
to sunken tetrasporangial conceptacles;
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- anatomical structure of lamellae
(longitudinal section): dorsiventral organization.
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tab. 24
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