Adiantum raddianum C.Presl

Yañez, A., Marquez, G. J., Berrueta, P. C. & García, R. A., 2021, An urban fern refugium: Municipal Ecological Reserve of Avellaneda (Eco Área) (Buenos Aires, Argentina), Blumea 66 (3), pp. 227-235 : 232

Adiantum raddianum C.Presl — Fig. 3c

Origin — Native. Widely distributed in tropical America from Mexico to Paraguay and Uruguay. In Argentina, it is distributed in the northwest, northeast and central provinces.

Habitat & Ecology — Terrestrial.

Location within the reserve — Mixed forest understory (see Blechnum auriculatum ). It has also been found growing in flooded soil along the banks of a stream, next to Gastoniella chaerophylla populations and under dense Equisetum giganteum populations.

Observations — During the in vitro culture carried out to obtain fertile specimens of G. chaerophylla , gametophytes of A. raddianum were observed growing from the substrate collected in the field. This highlights the importance of natural spore banks present in the soil of protected areas as reservoirs of biodiversity and potential tools for the conservation of native species ( Berrueta et al. 2021).

Illustration and morphological description reference — Giudice (2016)

Studied specimens. ARGENTINA, Buenos Aires,Mun.Avellaneda, Reserva Ecológica Municipal de Avellaneda (Eco Área), Yañez et al. 480 (BA), 18-IX-2018 ; Yañez et al. 487 (BA), 31-V-2019 ; Yañez et al. 570 (BA), 22-XII-2020 .