Lindsaea angustipinna A.Rojas & Tejero, 2017

Rojas-Alvarado, Alexander Francisco & Tejero-Díez, José Daniel, 2017, Novelties and notes in Lindsaea (Lindsaeaceae) from Mexico and Central America, Phytotaxa 296 (2), pp. 147-160 : 149-150

Lindsaea angustipinna A.Rojas & Tejero , sp. nov. ( Fig. 1 )

Lindsaea angustipinna is similar to Lindsaea falcata but differs in having trapezoidal (vs. falcate) pinnae with apices that are perpendicular to the rachis in the middle and ending portion (vs. arching down to apex). Additionally, the terminal pinnae are lanceolate (vs. ovate) and 2–3 times longer than wide (vs. 1–1.8 times in L. falcata ).

Type: — COSTA RICA. Guanacaste: Liberia, Parque Nacional Guanacaste, sendero al volcán Cacao, parte alta, 10°55 ʹ 58 ʺ N, 85°27 ʹ 41 ʺ W, 350–1300m, 7 August 2007, A. Rojas & G. Araya 7752 (holotype CR!, isotypes MO!, USJ!).

Perennial terrestrial herb, rhizomes short-creeping, 1–2 mm in diameter, with fronds 1–3 (5) mm between them; rhizome scales 1–1.5 × 0.2–0.3 mm, dark brown to reddish-brown, entire, crisped in the middle portion; fronds 17–30 cm long, with vertical stipes, arching or inclined in the blades; stipes 9–21 cm long, at least the basal half atropurpureous; blades 9–19 × 2.5–4.3 cm, 1-pinnate, lanceolate-oblong to oblong; rachises stramineous or sometimes basally dark, quadrangular, with stramineous wings; pinnae 1.2–2.1 × 0.6–0.9 cm, commonly 2.5–3.5 times longer than wide, (5–)13–20 pairs, trapezoidal, perpendicular to rachis, continuous to distant a half of pinna broad (rarely more distant at blade base), the apical segments 2–3 times longer than wide, hastate and lanceolate; sori continuous along acroscopic and distal sides of pinnules, indusia 0.2–0.3 mm broad, dark brown, entire to lobulate.

Distribution: —Mesoamerican endemic, actually known from Volcán Maderas in Nicaragua and Guanacaste and Tilarán mountains in Costa Rica at 1000–1350 m elevation.

Etymology: —The name refers to the characteristic narrow pinnae.

Additional specimens examined (paratypes):— NICARAGUA. Rivas: Isla de Ometepe, NW slope of volcán Maderas, to rim somewhat E of highest point, ca. 11°26–27 ʹ N, 85°30–31 ʹ W, 1000–1350 m, 24 February 1978, W. Stevens & B. Krukoff 6515 (CR!, MO).

COSTA RICA. Alajuela: San Ramón, Alto de La Palma , 1300 m, 30 November 1922, A. Brenes 3823 (129) ( CR!), ibidem, A. Brenes 7147 (161) ( CR!) ; ibidem, 10 October 1924, A. Brenes 7377 (4107) ( CR!). Guanacaste: La Cruz, Santa Cecilia, ca. 5 km de la Estación Pitilla, fila Orosilito , camino del campamento a los nacientes del río Mena , 10°58 ʹ 35 ʺ N, 85°27 ʹ 00 ʺ W, 1100–1200 m, 7 April 2008, A. Rojas 8338 ( CR!, USJ). Heredia: Barva, Transect Trail between Volcán Barva and Finca La Selva, 10°16 ʹ 34 ʺ N, 84°04 ʹ 56 ʺ W, 900 m, 2003, J. Kluge 3063 ( CR) .

Notes: —Specimens of this species have been previously identified as Lindsaea lancea or L. arcuata . Lindsaea angustipinna differs from L. lancea by stipes being at least in lower half atropurpureous (vs. completely stramineous), 1- pinnate (vs. 2-pinnate) blades and segments 2.5–3.5 times longer than wide (vs. 1.8–2.5 times). Lindsaea angustipinna is easy to separate from L. arcuata , besides the colour of the stipe, by the presence of an apical subconform segment in the blade (vs. apex gradually reduced). Furthermore, L. angustipinna differs from L. mesoamericana (here described) and L. leprieurii Hooker (1846: 208) , by pinnae (= ultimate segments) that have straight basiscopic sides (vs. falcate or arching).

Figures

FIGURE 1. Lindsaea angustipinna (A. Rojas & G. Araya 7752, CR). A. General aspect of type specimen. B. Abaxial blade detail.