Trichomanes pilosum Raddi,

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 : 13

9.1. Trichomanes pilosum Raddi, Opusc. Sci. 3: 296 (1819). Fig. 4d

Plants terrestrial or rupicolous. Stem ascending, decumbent or short-creeping, with dark-brown to blackish hairs. Fronds 5–24.7 cm long, monomorphic, pinnatifid; petiole 1.8–8.8 cm long, dark-brown to black, not alate, with pale brown hairs; rachis alate, with pale brown to slightly dark-brown hairs on both sides, without rooting apex; laminae 4–19.3 × 2.8–3.9 cm, lanceolate to arched; pinnae 1.1–1.7 × 0.3–0.7 cm, linear, membranaceous, with pale brown hairs on both sides, margins crenate, adnate to subsessile, apex rounded, contiguous to imbricate; veins free, false veins absent. Sori on the margin of the pinnae; indusia immersed in the laminar tissue.

Examined material: MARANHÃO: Alto ParnaÍba, PNNRP, 10°10’09’’S, 45°55’27’’W, 21.IV.2022, P. H. C. Aguiar et al. 22 ( CCAA); Cachoeira do Sussuapara , 10°09’56’’S, 45°55’38’’W, 425 m, 21.IV.2022, P. H. C. Aguiar et al. 27 ( CCAA, UB); P. H. C. Aguiar et al. 32 ( CCAA); 15.XII.2022, P. H. Castro-Aguiar et al. 176 ( CCAA); P. H. Castro-Aguiar et al. 238 ( CCAA, UB). PIAUÍ: Barreiras do PiauÍ, PNNRP, Cachoeira do Pintado , 10°11’28’’S, 45°51’12’’W, 436 m, 21.IV.2022, P. H. C. Aguiar et al. 45 ( CCAA); 10°11’26’’S, 45°51’08’’W, 436 m, 13.XII.2022, P. H. Castro-Aguiar et al. 59 ( CCAA); P. H. Castro-Aguiar et al. 65 ( CCAA, UB); P. H. Castro-Aguiar et al. 68 ( CCAA); P. H. Castro-Aguiar et al. 72 ( CCAA); Cachoeira do Urubu , 10°11’45’’S, 45°47’48’’W, 470 m, 14.XII.2022, P. H. Castro-Aguiar et al. 95 ( CCAA); P. H. Castro-Aguiar et al. 96 ( CCAA); P. H. Castro-Aguiar et al. 102 ( CCAA); Cachoeira Várzea Grande , 10°12’11’’S, 45°47’58’’W, 474 m, 14.XII.2022, P. H. Castro-Aguiar et al. 111 ( CCAA); P. H. Castro-Aguiar et al. 116 ( CCAA); P. H. Castro-Aguiar et al. 117 ( CCAA). TOCANTINS: São Félix do Tocantins, PNNRP, Cachoeira do Prata , 10°12’22’’S, 46°28’35’’W, 16.III.2023, P. H. Castro-Aguiar et al. 252 ( CCAA, UB).

Trichomanes pilosum has South American distribution occurring in Bolivia, Brazil, Paraguay, and Uruguay ( Windisch 2014). In Brazil, it occurs in all biomes, except the Pampa ( Gonzatti & Windisch 2023). In the study area, it was recorded growing on the soil or rocks, close to the edges of waterfalls, streams, and inside the gallery forest.

Trichomanes pilosum resembles T. cristatum Kaulf. due to the presence of involucrae subtended by lateral veins, stems decumbent to ascendant, and hairs light-chestnut to lightly dark-chestnut on the rachis. Meanwhile, T. cristatum differs principally in its erect linear to lanceolate 15–55 cm long fronds, whilst in T. pilosum the laminae are arched to lanceolate, reaching 25 cm long at most ( Windisch 1992; Kessler & Smith 2017).

Figures

Figure 4 – a.Elaphoglossum scalpellum – habit.b-c.Dicranopteris flexuosa – b. habit; c. sori on the abaxial surface.d.Trichomanes pilosum – habit. e. Trichomanes pinnatum – habit. f. Lindsaea divaricata – habit. g. Lindsaea lancea – habit. h-i. Metaxya parkeri – h. babit; i. sori on the abaxial surface. (a. P.H. Castro-Aguiar et al. 172; b-c. P.H. Castro-Aguiar et al. 67; d. P.H. Castro-Aguiar et al. 238; e. P.H. Castro-Aguiar et al. 173; f. P.H.C. Aguiar et al. 8; g. P.H.C. Aguiar et al. 28; h-i. P.H. Castro-Aguiar et al. 165).