Monographs Details: Lellingeria flexibilis Labiak
Authority: Labiak Evangelista, Paulo H. 2013. Grammitid ferns (Polypodiaceae). I. . Fl. Neotrop. Monogr. 111: 1--130. (Published by NYBG Press)
Family:Polypodiaceae
Description:Latin Diagnosis - Lellingeria flexibilis frondibus longis pendentibusque et rachidi conspicue flexuosa distinguenda. Species haec L. pseudocapillari similis, a qua lamina membranacea, segments longioribus (usque 6 cm longis) et inter se satis distantibus (sinus latitudene plus 4plo segmenta superans) differt.

Species Description - Plants epiphytic; fronds pendent, indeterminate; rhizome short-creeping, dorsiventral, with ventral root insertion, scaly, the scales 1.5-2 x 0.1-0.2 mm, linear-lanceolate, the apex long-attenuate, clathrate, blackish ciliate, the cilia simple, present on scale margins and apex (apical cilia sometimes furcate); petiole 3-5 mm, dark brown, slightly marginate, slightly pubescent, the hairs 0.1-0.2 mm long, spreading, 3- to 4-celled, whitish; lamina 30-40(-5 ) oblanceolate, membranaceous, pinnate, pairs of segments, abruptly reduced at the 5-7 segments shorter than the medial ones, the lowermost auriculiform, slightly decurrent onto petiole base, broadest above the base, not showing periodic constrictions, the apex abruptly reduced, pinnatifid, not ending in a conform or subconform segment; rachis flexuous (strongly so to the apex of the lamina), with dark sclerenchyma visible on both sides, pubescent on both sides, the hairs 0.1-0.2 mm long, 1- to 2-furcate, 2- to 3(-4)-celled, whitish; segments ca. 5-7 x 0.15—0.2 cm, plane, set 30-40° to rachis, asymmetric at the base (slightly constricted just above), long-decurrent basiscopically, cuneate acroscopically, the base attached obliquely on the rachis (i.e., the basiscopic side attaches on the abaxial side, and the acroscopic side on the adaxial side), not lobulate or overlapping the base of the next segment, the apex acute, the margin sinuate, glabrescent, the hairs 0.1 mm long, 1- to 2-furcate, abaxial lamina surface slightly pubescent, the hairs similar to those of the rachis abaxially, adaxial lamina surface glabrous; sinuses more than 4 times broader than the segments; venation pinnate, with 8-12(-15) pairs of veins per segment; costae with blackish sclerenchyma slightly visible abaxially, obscured by laminar tissue adaxially, sparsely pubescent abaxially, the hairs similar to those of the rachis abaxially, glabrous adaxially; veins simple, without blackish sclerenchyma, ending in hydathodes that lack calcareous deposits; sori medial, rounded, sometimes protruding beyond the costa and margin, 10—12(—14) pairs per segment, slightly sunken; sporangial capsules glabrous.

Discussion:Lellingeria flexibilis is readily recognized by the long and pendent fronds with strongly flexuous rachises. It differs from L. pseudocapillaris, the most similar species, by having membranaceous and long-attenuate segments (segments to 6 x 0.2 cm), and sinuses much broader than the segments (usually more than four times as broad). In contrast, L. pseudocapillaris has chartaceous laminae, shorter segments (2-4 x 0.3-0.4 cm), and sinuses only twice as broad as the segments.

This species may be closely related to Lellingeria pseudocapillaris and L. epiphytica. However, phylogenetic studies are needed to assess this relationship.
Distribution:Cusco Peru South America|