Practice question

Monilophytes, or fern lineage within Euphyllophyta sensu Kenrick and Crane, comprise Polypodiopsida including true leptosporangiate ferns and Equisetidae horsetails plus historically psilotophytes, sharing megaphyllous fronds with circinate vernation, mesarch or exarch xylem maturation, and common molecular synapomorphies from plastid phylogenomics. They exclude club mosses belonging to Lycophytes, exclude cycads and conifers belonging to gymnosperms within Lignophyta, exclude bryophytes to nonvascular grade. Inclusion of ferns plus Equisetum reflects consensus supporting monophyly of monilophytes sister to seed plants. This structural framework illustrates phylogenetic relationships and adaptive significance highlighted in competitive examinations focusing on comparative plant morphology and systematics.