Pleuromeiales †
Mesozoic clubmoss with cormose base
Mesozoic clubmoss with cormose base
Ecology & Form
Ecology & Form
Stems
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
Leaves
Lycophylls or microphylls are long and grass-like
Helically arranged
Roots
Roots
Lobed, cormose with stigmarian-type appendages
Reproduction
Reproduction
Terminal cones with sporangia
Sporangia on adaxial (top) surface
Homosporous and heterosporous forms
Classification
Classification
└Pleuromeiales †
Geologic Range
Geologic Range
Diversity
Diversity
Pleuromeia †
Cylostrobus †
Ferganodendron †
Lycostrobus †
Nathorstiana †
