What are the characteristics of Strobilus of Selaginella?
Strobilus: Spore producing structure Selaginella is heterosporous. The larger spores are megaspores and the smaller spores are microspores. Megaspores are produced in megasporangia and microspores are produced in microsporangia. Both sporangia are borne in the axils of leaves called microsporophyll and megasporophylls.
Is Selaginella Strobilus Homosporous or heterosporous?
Lycopodium is homosporous–all spores are roughly equal in size. Selaginella and Isoetes are heterosporous–spores are of two distinct sizes, microspores and megaspores. Most textbooks portray Selaginella as a delicate plant requiring constant moisture.
Which is Homosporous Lycopodium and Selaginella?
The key difference between Lycopodium and Selaginella is that Lycopodium is a clubmoss which is homosporous (one type of spore) while Selaginella is a spike moss which is heterosporous (two distinct types of spores). Lycopodium is a genus of club mosses while Selaginella is a genus of spike mosses.
What is the classification of Selaginella?
Isoetopsida
Selaginella/Class
What type of vascular arrangement is characteristic of the stem of Selaginella?
S. wallacei stems are characterized by a simple stele consisting of a single vascular segment (Fig. 2d).
What is phylum Lycophyta?
Vascular plant
Lycophyte/Phylum
Is strobilus a sporophyte or gametophyte?
You may recall the term strobilus (plural = strobili) describes a tight arrangement of sporophylls around a central stalk, as seen in pine cones. Some seeds are enveloped by sporophyte tissues upon maturation.
What is Strobilus in selaginella?
Similar to their close relatives, Selaginella plants develop strobili, spike-like reproductive organs that form on fertile branches. …
What is the function of the Strobilus of the horsetail?
Horsetails develop specialized structures known as a strobilus (plural: strobili), containing sporangiophores which develop large numbers of spores (or sporangia). In some species the strobilus develops at the top of the green or vegetative shoot.
What does the word strobilus mean?
Definition of strobilus 1 : an aggregation of sporophylls resembling a cone (as in the club mosses and horsetails) 2 : the cone of a gymnosperm.
What is the difference between Lycopodium and Selaginella?
The Lycophyta, to which Lycopodium (Clubmoss) and Selaginella (Spikemoss) belong, have vascular bundles for the transport of water, minerals and sugars. Thanks to these veins they can become bigger than mosses. The Lycophyta possess small microphyll leaves (microphyll = with a single, unbranched vascular bundle) arranged in a spiral.
What type of plant is Selaginella?
Selaginella. Selaginella is a genus of lycophytes commonly known as spike mosses. The genus includes around 700 species of primitive vascular plants that are found in a wide range of habitats in most regions of the world. Spike mosses are spore producing plants and are most closely related to quillworts.
What is the difference between spike mosses and Selaginella?
Spike mosses are spore producing plants and are most closely related to quillworts. Selaginella is the single remaining genus from the order of plants known as Selaginellales. One species, Selaginella lepidophylla, has a remarkable ability to tolerate drought and has earned the name ‘resurrection plant’.
Is Selaginella homoeophyllum or heterophyllus?
Besides, some species also have rhizophore (Fig.7.46A). Hieronymus (1902) divided the genus Selaginella into two sub-genera viz., Homoeophyllum and Heterophyllum on the basis of general structure of the plant body (Table 7.4). The stem is generally erect and radially constructed in the subgenus Homoeophyllum.