• monolete
• tight or loose perine

Lycopodium obscurum (clubmoss)

• trilete
• without perine
• with positive sculptual elements
• sculptural elements elongated
  parallel to surface
• reticulate
• muri with vertical walls
• reticulum not extending well
  onto proximal surface
• laesurae about 2/3 spore radius
• lumina small (up to 7 µm)

Pteridium aquilinum (bracken fern)

• without perine
• psilate/scabrate
• <45 µm
• laesurae simple, exine <1.5 µm thick

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GLOSSARY