Lindsaea divaricata Klotzsch,

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 : 14-15

10.1. Lindsaea divaricata Klotzsch, Linnaea 18(5): 547 (1845). Fig. 4f

Plants terrestrial. Stem short-creeping, with lanceolate scales, 1.3–1.9 cm long, pale brown to dark brown.Fronds 16.5–70 cm long, monomorphic, 2-pinnate, erect; petiole 9.7–43.4 long, dark brown to reddish-brown throughout, cylindrical abaxially, with two adaxial paleaceous wings distally, glabrous adaxially, with scales similar to those on the stem only at the base; rachis cylindrical abaxially, wings pale adaxially; laminae 7–27 × (3.2–) 9–19.7 cm, triangular; pinnae 5.7–17.5 × 1.5–3.5 cm, 1-pinnate, 1–4 pairs, terminal pinnae conform, usually larger than the lateral pinnae; pinnules 0.8–2 × 0.4–0.7 cm, dimidiate, chartaceous, glabrous on both sides, margins denticulate to crenate, apex rounded; veins free. Sori linear along the acroscopic margin of the pinnules; indusia linear.

Examined material: MARANHÃO: Alto ParnaÍba , PNNRP, Povoado Curupá , 09°53’05’’S, 45°53’20’’W, 380 m, 19.IV.2022, P. H. C. Aguiar et al. 8 ( CCAA, UB); 10°10’09’’S, 45°55’27’’W, 21.IV.2022, P. H. C. Aguiar et al. 34 ( CCAA); Cachoeira do Sussuapara , 10°09’56’’S, 45°55’38’’W, 425 m, 21.IV.2022, P. H. C. Aguiar et al.25 ( CCAA); P. H. C. Aguiar et al. 33 ( CCAA); P. H. C. Aguiar et al. 35 ( CCAA); 15.XII.2022, P. H. C. Aguiar et al. 169 ( CCAA, UB); P. H. C. Aguiar et al. 178 ( CCAA); trilha em direção a Cachoeira do Sussuapara , 10°10’10’’S, 45°55’27’’W, 407 m, 15.XII.2022, P. H. Castro-Aguiar et al. 175 ( CCAA, UB); Fazenda do Merval , próxima a casa de serraria, 09°49’22’’S, 46°16’14’’W, 373 m, 19.VII.2023, P. H. Castro-Aguiar et al. 318 ( CCAA, UB). PIAUÍ: Barreiras do PiauÍ, PNNRP, Cachoeira do Pintado , 10°11’26’’S, 45°51’08’’W, 436 m, 13.XII.2022, P. H. Castro-Aguiar et al. 64 ( CCAA); P. H. Castro-Aguiar et al. 66 ( CCAA); Cachoeira do Urubu , 10°11’45’’S, 45°47’48’’W, 470 m, 14.XII.2022, P. H. Castro-Aguiar et al. 100 ( CCAA, UB); Cachoeira Várzea Grande , 10°12’11’’S, 45°47’58’’W, 474 m, 14.XII.2022, P. H. Castro-Aguiar et al. 112 ( CCAA); Margem do Rio Curriola , 10°08’15’’S, 45°49’42’’W, 408 m, 13.XII.2022, P. H. Castro-Aguiar et al.80 ( CCAA); P. H. Castro-Aguiar et al. 81 ( CCAA); 14.XII.2022, P. H. Castro-Aguiar et al. 159 ( CCAA, UB).

Lindsaea divaricata has a Neotropical distribution, occurring from Costa Rica to South America and in the Caribbean region ( Rojas-Alvarado & Tejero-DÍez 2017). In Brazil, it is recorded for the Amazon, Cerrado, and Atlantic Rainforest biomes ( Pena et al. 2023). In the study area, it was recorded occurring in a wide range of habitats, growing along the margins of rivers, within gallery forests, around waterfalls, and in veredas.

Lindsaea divaricata is characterized by dark-chestnut to reddish-brown petioles, with two adaxial paleaceous wings distally, 1–2-pinnate fronds, ascendant pinnae, and pinnules 2–2.4 times as long as wide, dimidiate and ascendant.

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).