The large frond of Cycadites represented in fig.
They consist of a so-called "frond" - a flattened green more or less oval structure which emits branches similar to itself from lateral pockets at or near the base.
The nest is always firmly attached to seaweed, and sometimes suspended from an over-hanging frond.
E, Vertical section of frond of the complicated Siphoneous Green Alga Halimeda.
Professor Nathorst, as the result of a more recent examination of Heer's specimen, found that the segments of the frond are characterized by the presence of two parallel veins instead of a single midrib, with a row of stomata between them; for this type of Cycadean leaf he proposed the generic name Pseudocycas.