Cyclodium meniscioides (Willd.) C.Presl,

Castro-Aguiar, Pedro Henrique, Fernandes, Rozijane Santos & Zappi, Daniela Cristina, 2025, Ferns of the Parque Nacional das Nascentes do Rio Parnaíba Brazilian Cerrado, Rodriguesia (e 00612024) 76, pp. 1-24 : 10

6.1. Cyclodium meniscioides (Willd.) C.Presl, Tent. Pterid. 85, t.2, f.20 (1836). Fig. 3i

Plants terrestrial or rupicolous. Stem short to long-creeping, linear-lanceolate scales, 6–14 mm long, pale brown to blackish. Fronds dimorphic, 1-pinnate, fronds sterile 74–111 cm long, fronds fertile 84–108 cm long; petiole paleaceous to pale brown, adaxially sulcate, with scales similar to those on the stem at the base, petiole of sterile fronds 23–52 cm long, petiole of fertile fronds 26–65 cm long; rachis paleaceous to brown, adaxially sulcate, laminae lanceolate, sterile laminae 42–58 cm long, fertile laminae 32–42 cm long; pinnae 5–7 pairs, lanceolate, chartaceous to coriaceous, slightly ascending, median sterile pinnae 11.3–16 cm long, median fertile pinnae 6–8.5 cm long, with scales and micro-scales abaxially, margins crenate to serrate, base acute to cuneate, apex acute to acuminate; veins anastomosing, with 4–7 areoles between the costa and the pinnae margin. Sori rounded; indusia rounded, peltate.

Examined material: Alto ParnaÍba , PNNRP, Cachoeira do Sussuapara , 10°09’56’’S, 45°55’38’’W, 425 m, 21.IV.2022, P. H. C. Aguiar et al. 29 ( CCAA); P. H. C. Aguiar et al. 41 ( CCAA); 15.XII.2022, P. H. Castro-Aguiar et al. 160 ( CCAA, UB); P. H. Castro-Aguiar et al. 161 ( CCAA, UB) .

Cyclodium meniscioides has a South American distribution, from the Guianas region to Argentina ( Bohn et al. 2020). In Brazil, it occurs in the Amazon, Cerrado, and Atlantic Rainforest biomes ( Bohn et al. 2023). In the study area, this species was found forming large populations in arenitic soil near the waterfall margins.

Cyclodium meniscioides is characterized by dimorphic and, 1-pinnate fronds, anastomosed veins, and peltate indusia with minute hairs at the margin. Resembles Cyclodium pubescens Bohn & Labiak due to the 1-pinnate frond with conforming apex, and anastomosed veins, though C. pubescens differs with the presence of aciculate hairs, multicellular and translucent on the lamina, costae and rachis, while C. meniscioides has scales and microscales abaxially of the lamina ( Bohn et al. 2020).

Figures

Figure 3 – a. Anemia buniifolia – habit. b. Anemia oblongifolia - habit. c. Anemia presliana – habit. d-e. Blechnum areolatum – habit. f.Blechnum asplenioides – habit. g. Telmatoblechnum serrulatum – habit. h. Pteridium esculentum var.harpianum – habit. i. Cyclodium meniscioides – habit. (a. P.H. Castro-Aguiar et al. 280; b. P.H. Castro-Aguiar et al. 290; c. P.H. Castro-Aguiar et al. 170; d. P.H.C. Aguiar et al. 21; e. P.H. Castro-Aguiar et al. 171; f. P.H. Castro-Aguiar et al. 168; g. P.H.C. Aguiar et al. 05; h. P.H. Castro-Aguiar et al. 243; i. P.H. Castro-Aguiar et al. 160).