Eusporangiate ferns are vascular spore plants, whose sporangia arise from several epidermal cells and not from a single cell as in leptosporangiate ferns. Typically these ferns have reduced root systems and sporangia that produce large amounts of spores (up to 7000 spores per sporangium in Christensenia).
There are four extant eusporangiate fern families, distributed among three classes. Each family is assigned to its own order.[1][2]
Class Psilotopsida
Order Psilotales, family Psilotaceae – Whisk ferns (2 genera, about 17 species)
Order Ophioglossales, family Ophioglossaceae – Adder's-tongues (5 genera, about 80 species)
Class Equisetopsida
Order Equisetales, family Equisetaceae – Horsetails (1 genus, about 15 species)
Class Marattiopsida
Order Marattiales, family Marattiaceae – Marattoid ferns (6 genera, about 500 species)
The following diagram shows a likely phylogenic placement of eusporangiate fern classes within the vascular plants.[3][4]
Eusporangiateferns are vascular spore plants, whose sporangia arise from several epidermal cells and not from a single cell as in leptosporangiate ferns...
Ferns are defined here in the broad sense, being all of the Polypodiopsida, comprising both the leptosporangiate (Polypodiidae) and eusporangiate ferns...
the eusporangiateferns comprising the marattioid ferns (Marattiidae, Marattiaceae), the horsetails (Equisetiidae, Equisetaceae), and whisk ferns and...
largest known fronds of any fern. The Marattiaceae is one of two groups of ferns traditionally known as eusporangiateferns, meaning that the sporangium...
one of the groups traditionally known as eusporangiateferns. Members of the family differ from other ferns in a number of ways. Many have only a single...
July 2022. Murdock, Andrew G. (2008). "A taxonomic revision of the eusporangiatefern family Marattiaceae, with description of a new genus Ptisana". Taxon...
Marattia is a small genus of primitive, large, fleshy eusporangiateferns. It is the type genus of the family Marattiaceae, order Marattiales and class...
known as the leptosporangiate ferns, while the remaining three groups (subclasses) are referred to as eusporangiateferns. The Polypodiidae have been divided...
2021-12-30. Murdock, Andrew G. (2008). "A taxonomic revision of the eusporangiatefern family Marattiaceae, with description of a new genus Ptisana". Taxon...
Danaea is a fern genus of approximately 50 species in the eusporangiatefern family Marattiaceae. They are small to intermediately large ferns with erect...
Ptisana is a genus in the eusporangiatefern family Marattiaceae, comprising species historically treated in the genus Marattia. The establishment of this...
thick tapetum nourishes the developing spores, as is typical of eusporangiateferns like Psilotaceae. In the molecular phylogenetic classification of...
including horsetails (Equisetaceae), whisk ferns (Psilotaceae), and all eusporangiate and all leptosporangiate ferns. Historically both lycophytes and monilophytes...
As in other members of the family Ophioglossaceae, this species is eusporangiate, the sporangia derived from more than one initial cell and having sporangial...
informally referred to as eusporangiateferns, in contrast to the largest subclass, Polypodiidae or leptosporangiate ferns. The two orders, Ophioglossales...
PMID 21632388. Murdock, Andrew G. (2008). "A taxonomic revision of the eusporangiatefern family Marattiaceae, with description of a new genus Ptisana". Taxon...
May 2024. Murdock, Andrew G. (2008). "A taxonomic revision of the eusporangiatefern family Marattiaceae, with description of a new genus Ptisana". Taxon...
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