Pleuromeiales †

Ecology & Form

Stems

• Herbaceous or pseudoherbaceous

Morphology

• Upright and unbranched; 30 cm long and 2-3 cm wide in the earliest species to around 2 m long in later species

Anatomy

• Lacks secondary tissues

Leaves

• Lycophylls or microphylls are long and grass-like

• Helically arranged 

Roots

• Lobed, cormose with stigmarian-type appendages

Reproduction

• Terminal cones with sporangia 

  • Sporangia on adaxial (top) surface 

• Homosporous and heterosporous forms