A Study on the Gametophytic Germination (Prothallial Stages) of Pityrogramma calomelanos L. Link in Kerala, South India


Authors : Sruthy Krishnan G; Shiney Jacob

Volume/Issue : Volume 9 - 2024, Issue 1 - January

Google Scholar : http://tinyurl.com/mr3hcfcj

Scribd : http://tinyurl.com/yjb64a32

DOI : https://doi.org/10.5281/zenodo.10629001

Abstract : Pityrogramma belonging to the pteridaceae commonly known as Dixie silverback fern is characterised as the terrestrial herb with erect, densely scaly rhizome 4×2 cm. scales 2.6×0.2- 0.5mm, brownish, linear, entire. Fronds 80-100×20-22cm, bipinnate, stipe 40-50cm, dark pinkish brown, polished, lamina triangular in outline, pinnae 11×2.5cm, lanceolate, acuminate, in outline, pinnules 1.5×0.7cm, rhomboid to lanceolate, acute. Lobed to serrate, pinnae and pinnules progressively reduced to apex, rachis and costa grooved above, raised below, lower surface of the pinnules were white crusted. Sori acrostichoid, sporangial capsule 275-312.5×250 μm, globose, stalk 250μm long. Spores are 50×50μm triangular in outline, yellowish with pinkish thickening (Easa 2003). Prothallus of the fern is an essential part in their life. Spores with proper care and maintenance, the various stages of prothallial germination can be noticed.

Keywords : Pityrogramma calomelanos, Prothallus, Gametophyte, Spore.

Pityrogramma belonging to the pteridaceae commonly known as Dixie silverback fern is characterised as the terrestrial herb with erect, densely scaly rhizome 4×2 cm. scales 2.6×0.2- 0.5mm, brownish, linear, entire. Fronds 80-100×20-22cm, bipinnate, stipe 40-50cm, dark pinkish brown, polished, lamina triangular in outline, pinnae 11×2.5cm, lanceolate, acuminate, in outline, pinnules 1.5×0.7cm, rhomboid to lanceolate, acute. Lobed to serrate, pinnae and pinnules progressively reduced to apex, rachis and costa grooved above, raised below, lower surface of the pinnules were white crusted. Sori acrostichoid, sporangial capsule 275-312.5×250 μm, globose, stalk 250μm long. Spores are 50×50μm triangular in outline, yellowish with pinkish thickening (Easa 2003). Prothallus of the fern is an essential part in their life. Spores with proper care and maintenance, the various stages of prothallial germination can be noticed.

Keywords : Pityrogramma calomelanos, Prothallus, Gametophyte, Spore.

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