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Meiosis in spore mother cell of ferns. (A) Botrychium daucifolium (n = 90). (B) Angiopteris helferiana (n = 80). (C) Abrodictyum obscurum (n = 33). (D) Crepidomanes latealatum (n = 36). (E) Dicranopteris linearis (n = 39). (F) Lindsaea heterophylla (n = 92). (G) Microlepia speluncae (n = 43). (H) Pteridium revolutum (n = 52). (I) Adiantum hispidulum (n = 171). (J, K) Adiantum raddianum (n = 57, n = 114). (L) Antrophyum plantagineum (n = 45). (M) Cheilanthes viridis (n = 90). (N) Cheilanthes tenuifolia (n = 56). (O) Doryopteris concolor (n = 30).
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The chromosomal observations were carried out on 66 taxa collected from Kolli Hills belongs to 38 genera and 20 families. Sixty two ferns were studied cytologically for the first time in this study area. The present study has revealed the presence of 32 sexual diploids, 20 sexual tetraploids, 2 apogamous tetraploids, 9 sexual octoploids, 2 apogamou...
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Citations
... India as a mega diversity country has a massive and rich diversity of fern and their allies represented by 1157 species [8]. Kolli hills are a part of Eastern Ghats in Tamil Nadu, India supporting large growth of diverse ferns [9,10]. About four hundred species of pteridophytes occur in south India of which ferns are a part [11]. ...
This is an Open Access Journal / article distributed under the terms of the Creative Commons Attribution License (CC BY-NC-ND 3.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. All rights reserved. The present report is about the study of phytochemicals of some medicinally important fern species collected from Udhagamandalam, the Nilgiri district, Tamil Nadu, India. Standard methods were used to examine the secondary metabolites like alkaloids, proteins, carbohydrates, flavonoids, terpenoids, glycosides phenolic compounds, and tannins in the plant extracts. Using a Soxhlet apparatus, the material was shade dried and powdered fronds (50g) were extracted progressively with 250 ml of methanol, ethanol, acetone, and distilled water for 7 hours at a temperature of 50-65 ºC. (not greater than the boiling point of solvent). Among the forty tested extracts, thirty extracts showed the presence of carbohydrates (75%) and 37 extracts showed proteins and free amino acids 92%), 17 (42%) flavonoids, 21 (52%) phenolic compounds and tannins, 22 (55%) glycosides, 22 (55%) terpenoids, 16 (40%) alkaloids. The findings reported the existence of several bioactive elements that could be utilized for future therapeutic applications. Based on the results of this study, it can be determined that the 10 medicinal ferns chosen contain more bioactive constituents. The potent ferns have the potential to be exploited as bio control agents.
... So far, chromosome numbers are known for ca. 46 species of Adiantum (Mehra & Verma 1960;Roy & Sinha 1961;Abraham et al. 1962;Manton et al. 1970;Irudayaraj & Manickam 1987;Manickam & Irudayaraj 1988;Paris & Windham 1988;Kato et al. 1992;Paris 1993;Wagner & Boydsten 1978;Perwati & dan Purnomo 2002;Tindale & Roy 2002;Nakato & Kato 2005;Pedro et al. 2006;Bir & Verma 2010;Saggoo & Kaur 2016;Vijayakanth et al. 2018). Many more cytotaxonomic studies on this genus are urgently needed to help clarify classification among closely related species, since polyploidization and hybridization are common in the A. caudatum Linnaeus (1771: 308) complex and A. pedatum Linnaeus (1753: 1095) complex (Manton et al. 1970, Nakato & Kato 2005 Wang &F.W. Xing (2017: e0172729) andA. ...
Chromosome traits may differ between closely related ferns growing in different geological landscapes. Adiantum series Gravesiana (Pteridaceae) includes six species, of which, five species are exclusively distributed in Karst landforms, and one, Adiantum juxtapositum, grows on Danxia landform. Additionally, there are some populations or individuals whose morphology are between different species, which may be the results of polyploidization or hybridization. Here we studied chromosome numbers of species in series Gravesiana primarily using crosiers. Results are: A. longzhouensis and A. juxtapositum were diploids with 2n = 60 and 2n = 64, respectively; A. dentatum was deduced to be diploids with 2n = ca. 60; A. mariesii had two cytotypes, 2n = 60 (diploid) and 2n = ca. 120 (tetraploid), respectively; A. gravesii had four cytotypes including 2n = ca. 60 (diploid), ca. 120 (tetraploid), ca. 150 (pentaploid), and ca. 180 (hexaploid). All these different cytotypes suggest polyploidization and hybridization have occurred in A. gravesii and A. mariesii, so we treated these two species as two “complex group”. All chromosome numbers in this study are the first record.
Taxonomic importance of spore morphology of seven taxa of genus Asplenium (Aspleniaceae) from Pakistan is illustrated with SEM. Spore morphology of the taxa were monolete with bilateral symmetry, distal and proximal view were ellipsoidal, spheroidal, equatorial view were hemicircular; perispore surface were alate, costate, costate‐alate, with reticulate and tuberculate ornamentation.
Taxonomic importance of spore morphology of seven taxa of Asplenium (Aspleniaceae, polypodiales) from Pakistan.
Basionym, Synonyms with updated nomenclature.
Spores are monolete, distal and proximal view ellipsoidal, spheroidal, equatorial view hemicircular, perispore with alate, costate, reticulate, and tuberculate surface.
Habitat ecology with specimens examined from different areas of Pakistan and their worldwide general distribution.
The fern genus Tectaria Cav., (Tectariaceae) is one of the largest, morphologically diverse and more complex genera having difficulties in identifying the species and their groups. Since its description, a number of new genera had been separated from it or merged within it created considerable ambiguity. Thus, the main aim of the present review is to provide comprehensive information of the taxonomy, cytology, anatomy, palynology and molecular research carried out so far on the genus Tectaria. Present work is not merely compilation but includes personal observations and is presented here after critical evaluation.
