What are the characteristics of Lycopsida?
Lycopods are characterized by dichotomizing branches; spores borne in spore cases (sporangia) on the upper side of the fertile leaves (sporophylls), which are sometimes organized into cones; and ‘microphyllous’ leaves, i.e. with a single strand of vascular tissue proceeding unbrokenly (without a ‘leaf gap’) from the …
What is an example of Lycophyte?
Selaginella
LepidodendronIsoetalesSigillariaceaeHuia
Lycophyte/Lower classifications
Are ferns Lycopsids?
… vascular plants include the seedless lycophytes and ferns (both groups are considered lower vascular plants) and the two groups of seed plants, the gymnosperms and angiosperms. In the genus Lycopodium, the club mosses, the sporangia are closely associated with the leaves.
What is meant by Lycopsida?
: a subdivision of Tracheophyta coextensive with the class Lycopodineae comprising vascular plants (as the club mosses and related forms) with small leaves, sessile and adaxial sporangia, and no leaf gaps in the primary vascular cylinder — compare psilopsida , pteropsida , sphenopsida.
Why Lycopsida are known as club mosses?
Lycopodium (from Greek lukos, wolf and podion, diminutive of pous, foot) is a genus of clubmosses, also known asground pines or creeping cedar, in the family Lycopodiaceae, a family of fern-allies (see Pteridophyta). The club-shaped appearance of these fertile stems gives the clubmosses their common name.
How do you identify a lycophyte?
The distinguishing features of the lycophytes are the arrangement of their vascular tissues and their leaves—microphylls with only a single vascular strand. The sporangia on the modern plants are kidney-shaped, like those of the ancestral forms, and borne on sporophylls clustered in strobili.
Is Selaginella a lycophyte?
One amazingly resilient lycophyte, Selaginella lepidophylla, is commonly known as the resurrection plant because it can become completely dry and brown but is able to be resurrected and resume full growth with the addition of water.
What are Sphenopsids?
Definition of sphenopsid : any of a class or division (Sphenopsida or Sphenophyta) of primitive vascular plants characterized by jointed ribbed stems, small leaves usually in whorls at distinct stem nodes, and sporangia in sporangiophores and made up of the horsetails and extinct related forms.
What type of leaves do lycophytes have?
The leaves of lycophytes are microphylls. The leaves of the Lycophyta each have a single unbranched vein, or strand of vascular tissue, which supplies the leaf with water and distributes manufactured nutrients to other portions of the plant.
Do lycophytes have true roots?
The living lycophytes are widely distributed but reach their greatest species diversity in the tropics. The lycophytes are similar to the higher vascular plants—the gymnosperms and angiosperms—in having vascular tissue and true leaves, stems, and roots.
Which one comes under Lycopsida?
Plant body shows differentiation into root, stem and leaves. Leaves are microphyllous (small) having a single unbranched vein in the midrib region. Sporangia are borne in the axil of the fertile leaves.
Do lycopsid leaves have phloem?
Lycopsid leaves, also known as microphylls, contain only a single bundle of vascular tissue with little if any phloem. (In contrast, the leaves of ferns and seed plants, also known as megaphylls, contain multiple vascular strands and considerable amounts of phloem.)
What is a lycopsid?
The earliest known lycopsid, Baragwanathia, is known from the Middle or Late Silurian of Australia as well as the Early Devonian of Euramerica. It’s a herbaceous plant that appears to be most closely related to the modern day club mosses (e.g., Lycopodium ). Club mosses are homosporous (they produce uniformly-sized bisexual spores).
How are Lycopodiopsida distinguished from other vascular plants?
The Lycopodiopsida are distinguished from other vascular plants by the possession of microphylls and by their sporangia, which are lateral as opposed to terminal and which open (dehisce) transversely rather than longitudinally. In some groups, the sporangia are borne on sporophylls that are clustered into strobili.
Are there any arborescent lycopsids?
A lycopsid from Kazakhstan, Atasudendron, was estimated to be 2-3 m high and had a greater differentiation of stem tissues that did the Chinese species. Heterospory was found in Chamaedendron and the reproductive organ of a lycopsid from Kazakstan. Early arborescent lycopsids have also been reported from Euramerica.