Observations on indusia in Adiantum L. (Pteridaceae : Vittarioideae) of North-East India

Abstract

The present paper highlights the indusial character in eight (8) species of Adiantum L. (PteridaceaeVittarioideae) found in North East India. These include A. capillus-veneris L., A. caudatum L., A. edgeworthii Hook., A. flabellulatum L., A. incisum Forssk., A. peruvianum Klotzsch, A. philippense L. and A. raddianum C. Presl. Data on the morphology of indusia, spore size and exine ornamentation are studied in order to assess their systematic significance. A key to species based on indusial characters is also incorporated.

Taxonomy and spore morphology of genus Adiantum (Vittarioideae; Pteridaceae) from Pakistan

“…The spore of A. incisum subsp. incisum were trilete, triangular in proximal and distal view, spheroidal, hemicircular in equatorial view, size 36–42 × 40–45 μm, perispore dark brown, with granulose and tuberculate, faintly rugulose surface, that agrees with the previous studies of (Nayar & Devi, 1967; Tryon & Lugardon, 1991, 2012); while Yumkham et al (2017) reported spore size 35 × 40 μm, with densely verrucate surface. The spore of A. pedatum subsp.…”

“…The spore of Adiantum capillus‐veneris was trilete, triangular at distal side, contains triangular laesura arms in proximal view, equatorial side hemispherical with equatorial flange at the middle, surface tuberculate, size 35–42 × 38–45 μm, perispore dark brown, translucent, with faintly granulose surface, that agrees with the earlier results of (Jiaxi, 1997; Nayar & Devi, 1967). Salimpour, Nazi, and Mazooji (2011) reported spore size 35.4 × 41.4 μm, with circular shape and rugulate‐gemmate ornamentation from Iran; Mazooji and Salimpour (2014) reported spore size 38 × 44.5 μm, with circular shape, trilete aperture, and rugulate ornamentation from Iran; while Yumkham, Singh, and Khomdram (2017) reported spore size 42 × 57 μm, with granulose surface from North‐East India; Murtaza et al (2006) reported spore size 37 × 47 μm from Pakistan. The spore of A. incisum subsp.…”