Danaea ampla Keskiniva & Tuomisto
Descripción
Rhizomes creeping, dorsiventral, 2–5 cm in diam., leaf bases in two rows, to 15 cm long. Sterile leaves 56–150 cm long; petioles 26–68 cm long, no nodes, not winged; laminae 29 × 73 cm, (long-)obovate, lanceolate or oblong, imparipinnate, 4–13 pinna-pairs, medial pinnae 4.0–5.0 cm apart, concolorous, light yellowish grey green to green, texture thin to intermediate (border slightly thicker), rachises usually not winged or only winged in distal part of lamina, wings to 1 mm wide; terminal pinnae 14–24 × 3.4–5.0 cm, oblong, elliptic or lanceolate, bases acute, apices 2–4.5 cm long, (long-)acuminate, margins of apices slightly to very sinuate; largest lateral pinnae 14–26 × 3.1–4.9 cm, 2.4–5.6 times as long as wide without apex, parallel-sided or widest above middle, pinna apices symmetrical (acute) or asymmetrical (obtuse proximally, acute distally), apices 1.3–4.1 cm long, (long-)acuminate (rarely cuspidate or caudate), margins of apices entire to clearly sinuate (rarely serrulate at shoulder of pinna); veins 10–15 per cm, mostly forked at costae, sometimes above. Fertile leaves 69–117 cm long; petioles 41–67 cm long, no nodes; laminae 28–50 × 17–21 cm, (long-)obovate to lanceolate, imparipinnate, 4–7 pinna-pairs; terminal pinnae 9–12 × 1.3–2.2 cm, lanceolate, bases acute, apices acuminate to cuneate; largest lateral pinnae 11–18 × 1.4–2.1 cm, long-elliptic, parallel-sided or lanceolate, bases symmetrical (acute to cuneate) or asymmetrical (obtuse proximally, acute distally), apices 1.0–2.5 cm long, acuminate to cuneate, margins of apices entire. Juveniles with elliptic, oblanceolate or oblong pinnae, rather wide, largest simple juvenile 7.5 cm long, smallest observed pinnate juvenile 5 cm long.A
Ejemplar revisado
Veracruz: Los Tuxtlas biological field station, 18°35'N, 95°04'W, 100–150 m, 29 Jun 2017, Tuomisto 17491 (TUR! (6), UC-3!, XAL-4, Z-3!); Los Tuxtlas biological field station, 18°35'N, 95°04'W, 100–150 m, 29 Jun 2017, Tuomisto 17494 (TUR-2!, XAL-3).A
Elevación
100 – 150 mA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Diagnosis — Similar to Danaea nodosa (L.) Sm., but differs in usually fewer pairs of fertile pinnae (4–7 vs (6–)8–16); generally shorter and wider sterile pinnae (medial pinnae 2–6 vs 4–8 times as long as wide without apex); usually oblanceolate pinnae (vs usually oblong); genetically differs in locations 123 (G vs A), 282 (A vs G), 453 (G vs T) of trnL-F reference sequence; 621 (T vs C), 637–639 (gap vs AAA), 642 (A vs C), 673 (A vs G) of rpl32 reference sequence.
Etymology — Ampla is a Latin word for wide, referring to the generally wider, shorter pinnae of Danaea ampla in comparison to D. nodosa, from which it was separated.
Remarks — Danaea ampla is a relatively small species in D. subg. Danaea. It is similar to D. nodosa but has generally shorter and wider pinnae (medial pinnae 2–6 vs 4–8 times as long as wide without apex) that are usually oblanceolate (vs usually oblong). Most remarkably, fertile leaves of D. ampla have only 4–7 pinna-pairs (vs (6–)8–16 in D. nodosa), and the sterile leaves also have generally fewer pinnae (4–13 vs (6–)10–16). Unfortunately, the morphological characters overlap between D. ampla and D. nodosa, and there are cases where DNA is needed for certain identification. We have sequenced specimens of D. ampla from both Mexico and Panama, so it can be assumed that some of the existing specimens from the intervening areas belong to this species, but we have not been able to identify any with confidence.
A
Etymology — Ampla is a Latin word for wide, referring to the generally wider, shorter pinnae of Danaea ampla in comparison to D. nodosa, from which it was separated.
Remarks — Danaea ampla is a relatively small species in D. subg. Danaea. It is similar to D. nodosa but has generally shorter and wider pinnae (medial pinnae 2–6 vs 4–8 times as long as wide without apex) that are usually oblanceolate (vs usually oblong). Most remarkably, fertile leaves of D. ampla have only 4–7 pinna-pairs (vs (6–)8–16 in D. nodosa), and the sterile leaves also have generally fewer pinnae (4–13 vs (6–)10–16). Unfortunately, the morphological characters overlap between D. ampla and D. nodosa, and there are cases where DNA is needed for certain identification. We have sequenced specimens of D. ampla from both Mexico and Panama, so it can be assumed that some of the existing specimens from the intervening areas belong to this species, but we have not been able to identify any with confidence.
A