Does Lycopodium have strobilus?
In Lycopodium, the strobili are made up of modified leaves (sporophylls), each of which bears a sporangium on its adaxial (upper) surface (Fig. 1). Look for the sporangia on the adaxial surface of the leaves. Also look closely at the sporangia; they are open and the spores have been released.
How does the xylem of some species of Selaginella differ from Lycopodium?
Selaginella species are mostly tropical; they are similar in structure to Lycopodium but rather more delicate and they usually grow in damp places. A big difference from Lycopodium is that they are heterosporous.
Which group of lycophytes has strobili?
Lycophytes. Some members of both of the two modern classes of Lycopodiophyta (Lycopodiopsida and Isoetopsida) produce strobili. In all cases, the lateral organs of the strobilus are microphylls, bearing sporangia. In other lycophytes, ordinary foliage leaves can act as sporophylls, and there are no organized strobili.
What is Strobilus in Lycopodium?
The plant bearing strobilus is the sporophytic phase of the life cycle. Strobilus bears spirally arranged sporophylls with sporangium which produces numerous spores. The spores come out from the sporangium and germinate in the soil to form a small top shaped prothallus. This is the gametophytic phase of the life cycle.
Do Lycopodium have microphylls?
3: A closer view of the Lycopodium sporophyte shown above. The branches occur in Y-formations, showing dichotomous branching. There are many small, thin leaves (microphylls).
What features group Lycopodium and Selaginella in same phylum?
what feature groups Lycopodium and Selaginella in the same phylum? some species of horsetail have whorled branches at each node, and other species are unbranched. both types have small, scalelike leaves or microphylls arranged in a whorl at the nodes.
What are the characteristics of Lycophyta?
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 ligule present in Lycopodium?
Note: In Lycopodium there is a ligule, a strange tongue-like outcrop from the surface of the leaf at the base of the leaf. Leaves of Lycopodium and Selaginella can be distinguished on this basis. The ligule, which occurs very early in the growth of the leaf, is surprisingly complex at maturity.
What is strobilus of Equisetum?
Members of the genus Equisetum, horsetails are a type of hollow-stemmed plant that exhibits an extensive creeping root system. Sometimes alternatively known as horse pipes, mare’s tail, or snake grass, horsetails thrive best in damp environments, such as swamps, bogs, and stream banks.
Where are the strobilus of Lycopodium?
The kidney-shaped (reniform) spore-cases (sporangia) contain spores of one kind only, (isosporous, homosporous), and are borne on the upper surface of the leaf blade of specialized leaves (sporophylls) arranged in a cone-like strobilus at the end of upright stems.
Where are strobili found in Lycopodium?
Usually the leaves near the apical portion of the branches bear sporangia and are called sporophylls. Depending upon the species the sporophylls may or may not be differentiated from the ordinary leaves. These sporophylls usually form a condense structure at the apex of the branches which are known as strobili.
Does Lycophyta contain megaphylls?
Contrary to vascular plants from higher divisions, lycophytes have leaves with a single vascular bundle called microphylls instead of leaves with a more complex network of vasculature called megaphylls (Doyle, 2013; Kenrick, 2013).
What is Selaginella Strobilus?
The genus Selaginella is classified in the division Lycophyta, which includes the numerous plants commonly known as clubmosses and spike mosses. Similar to their close relatives, Selaginella plants develop strobili, spike-like reproductive organs that form on fertile branches.
How many types of Prothalli are present in Lycopodium?
There is great diversity in form and structure of mature gametophytes in the different species of Lycopodium. There are three main types of mature prothalli.
What does ligule mean?
Definition of ligule : a scalelike projection especially on a plant: such as. a : a thin appendage of a foliage leaf and especially of the sheath of a blade of grass. b : a ligulate corolla of a ray floret in a composite head.