#ferns

• Acrogenous — Regarding plants or structures; developing, growing, or originating exclusively at the tip, apex, or upper extremity, typical of vascular cryptogams like ferns.
• Acrostichum — A genus of large, massive, and vibrant ferns belonging to the Pteridaceae family, characterized by their unique structural adaptation to saline environments, being the only ferns that grow natively in mangrove swamps and tropical and subtropical intertidal coastal zones. The genus is distinguished by large, pinnate, leathery (coriaceous) fronds and by the fact that fertile sporangia are not grouped into distinct sori but cover uniformly and densely the entire lower surface of the terminal pinnae.
• Adiantopsis — A genus of terrestrial ferns in the Pteridaceae family, Cheilanthoideae subfamily, structurally distributed primarily throughout the tropical and subtropical regions of South and Central America. These plants are recognized for their short, often erect rhizomes and elegant leaves, divided in a pedate, digitate, or pinnate manner, which feature marginal false indusia (sori protected by the reflexed leaf margin), possessing resilient structural adaptations in rocky habitats or forest edges.
• Anogramma — A genus of small, terrestrial ferns in the Pteridaceae family, characterized by finely dissected fronds and an annual or ephemeral lifecycle unusual for pteridophytes. The best-known species is Anogramma leptophylla, a unique structural plant that survives from year to year primarily as a perennial tuberous gametophyte, colonizing damp, shaded, rocky soils in Mediterranean and temperate climates.
• Genus Asplenium — A major taxonomic genus of ferns in the Aspleniaceae family, popularly known as spleenwort; it comprises over 700 cosmopolitan species, either epiphytic or terrestrial, adapted to shaded environments, limestone rocks, and tropical tree bark. It is characterized by short rhizomes, often leathery leaves (either entire or divided), and elongated sori arranged obliquely along the secondary veins, globally cultivated as hardy ornamental plants.
• Asplenium dimorphum — A rare species of perennial fern in the Aspleniaceae family, endemic to Norfolk Island in the Pacific Ocean, popularly known as the two-branched spleenwort. It stands out due to its spectacular structural phenomenon of foliar dimorphism, developing two completely different types of fronds on the same plant: the sterile ones are broad, glossy, and partially divided, while the fertile fronds, which bear the spores, are finely dissected into thread-like segments, giving the plant a highly distinctive exotic look.
• Athyrium — A widespread genus of terrestrial ferns in the family Athyriaceae, distributed globally but predominantly found in temperate and mountainous regions of the Northern Hemisphere. They are characterized by elegant, finely divided fronds and sori arranged along the veins, often protected by a comma-shaped, horseshoe-shaped, or crescent-shaped indusium.