WebTwo living genera, Psilotum and Tmesipteris, with only two species of the former and less than 30 of the latter, constitute the entire phylum.Both genera are weeds in the tropics and subtropics. Tmesipteris is confined to the islands of the South Pacific, including Australia and New Zealand whereas Psilotum is more widespread, reaching parts of the southern … http://www.nou.ac.in/econtent/Msc%20Botany%20Paper%20IV/MSc%20Botany%20Paper-IV%20Unit-9a.pdf
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WebOct 12, 2014 · Psilotum. 1692 Views Download Presentation. Psilotum. This seedless vascular plant has only stems. It does not have any leaves or roots. The small green extensions on the stems are scales, simple flaps … WebPsilopsida: Distribution, distinguishing characters, morphology and anatomy of sporophyte and gametophyte of Psilotum (1) Lycopsida : Distribution, distinguishing characters, affinities, morphology and anatomy of sporophyte and gametophyte of Lycopodiales, Selaginellales, Isoetales and their life cycle pattern (4) hypophosphites
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WebApr 28, 2014 · (a) Protoplast filaments from Psilotum nudum cell extract contain condensed-Ms (3 small arrows) that enlarge as spheroid protoplasts (short arrow) and Aureobasidium pullulans conidia (long arrow). (b and c) A. pullulans hyphae cultured 14 months in distilled water + erythromycin (Ms longevity test) produced condensed-Ms that … Psilotum superficially resembles certain extinct early vascular plants, such as the rhyniophytes and the trimerophyte genus Psilophyton. The unusual features of Psilotum that suggest an affinity with early vascular plants include dichotomously branching sporophytes, aerial stems arising from horizontal rhizomes, a simple vascular cylinder, homosporous and terminal eusporangia and a lack of roots. Unfortunately, no fossils of psilophytes are known to exist. A careful study of the morph… WebMay 29, 2024 · Taxonomy and spore morphology of genus Adiantum (Vittarioideae; Pteridaceae) from Pakistan is illustrated with scanning electron microscopy images based upon the specimens examined in herbaria of Pakistan, United Kingdom, and United States. A total of five species viz. Adiantum capillus-veneris, A. incisum subsp. incisum, A. … hypophyllus obscurellus