Ctenitis laetevirens (Rosenst.) Salino & Morais (2003: 34)

Viveros, Raquel Stauffer, Rouhan, Germinal & Salino, Alexandre, 2018, A taxonomic monograph of the fern genus Ctenitis (Dryopteridaceae) in South America, Phytotaxa 385 (1), pp. 448-450 : 448-450

publication ID	https://doi.org/ 10.11646/phytotaxa.385.1.1
persistent identifier	https://treatment.plazi.org/id/03FFC963-C669-FFFF-FF65-06B1FC1B9190
treatment provided by	Felipe
scientific name	Ctenitis laetevirens (Rosenst.) Salino & Morais (2003: 34)
status

Treatment

16. Ctenitis laetevirens (Rosenst.) Salino & Morais (2003: 34) View in CoL . Figs. 02C, 06C, 08F, 10C, 21A–B, 23A. Dryopteris laetevirens Rosenstock (1915: 368) . Type:— BRAZIL. Santa Catarina: Hammonia (Ibirama), August 1910, Lüderwaldt 1380 (lectotype SP! designated by Salino & Morais 2003, isolectotypes BM 000937872!, S05-11180!); remaining syntypes:— BRAZIL, Santa Catarina: Blumenau, Haerchen 09 (S-R-1728!); Haerchen 50 (UC!); Goeden 50 (S 05-11179!).

Stems ascending, 0.9–1.8 cm diam., scales 5.8–11.6 × 0.3–0.7 mm, castaneous, subclathrate, linear-lanceolate, entire or slightly denticulate, with or without some short fimbriae laterally; leaves 49–108.5 cm long; petioles 26.5–50.5 cm × 1.8–4.5 mm, with 4 or 5 vascular bundles at base, stramineous, scales 3.3–9.3 × 0.2–0.7 mm, castaneous on petiole base, becoming dark brown to blackish on distal portion, clathrate or subclathrate, not tangled or somewhat tangled on petiole base, becoming appressed towards distal portion, flattish, stiff, linear-lanceolate with truncate or slightly cordate base and filiform apex, entire or slightly denticulate, with or without some short fimbriae laterally, catenate trichomes absent abaxially, glandular trichomes absent; laminae 22.5–58 × 14.2–26.5 cm, width 1/3–1/2 of length or wider, 1-pinnate-pinnatifid basally, medially and apically, lanceolate or ovate, apex confluent; rachises stramineous, scales like those on distal portion of petioles, sparse or absent catenate trichomes abaxially, glandular trichomes absent; pinnae 6–15 pairs, the basal and medial ones stalked to 5.1 mm long, the apical ones sessile, basal pinnae basiscopically and acroscopically somewhat equally developed, the medial 8.7–16.0 × 1.7–3.2 cm, linear-lanceolate, incised 2/3–3/4 of the distance between the segment apex and costa, basal segments shorter on basal pinnae, shorter or as long on medial pinnae, apex attenuate; adaxial pinnae axes very sparse scales on costa, 0.7–2.2 × 0.06 mm, dark brown to blackish, filiform, catenate trichomes dense on costa, rare on costule, bacilliform trichomes absent; adaxial laminar surface between veins glabrous; abaxial pinnae axes with sparse scales on costa and sometimes also on costule, 1.2–3.1 × 0.06–0.2 mm, dark brown to blackish, clathrate, ascending, flattish or twisted, stiff, linear-lanceolate with truncate, rounded or slightly cordate base and filiform apex, entire or slightly denticulate, with some short fimbriae at base, proscales to 0.6 mm long sparse on costule, catenate trichomes absent, bacilliform trichomes absent, glandular trichomes absent, filiform trichomes absent; abaxial laminar surface between veins glabrous; segments 13–17 pairs, 3.8–6.0 mm wide, patent or subfalcate, serrate towards apex, apex apiculate, margin glabrous, the distance from each other is narrower than segments width; veins simple, 6–11 pairs per segment, the basal ones from adjacent segments end at margin somewhat or well above the sinus; sori medial or supramedial, indusia absent; spores aborted.

Selected specimens examined:— BRAZIL. Santa Catarina: Blumenau, 1905, Haerchen 50 ( UC) ; Pouso Redondo, BR 470, próximo à Serra da Santa antes do Morro do Funil , 27 o 16’51’’S, 50º04’03’’W, 530 m, 07 April 2010, Salino et al. 14724 ( BHCB) GoogleMaps ; Vitor Meireles, Pratinha, 06 November 2009, Schimitt et al. 561 ( BHCB) .

Habitat and distribution:— Terrestrial. Endemic to Atlantic Forest , 0–550 m. Only in Santa Catarina state, in Brazil ( Fig. 23A View FIGURE 23 ; Tab. 01) .

VIVEROS ET AL. A TAXONOMIC MONOGRAPH OF CTENITIS IN SOUTH AMERICA

Notes:— Ctenitis laetevirens can be recognized by its scarce indument: sparse dark brown to blackish scales on costa abaxially, which are stiff, flattish or twisted and linear-lanceolate (Figs. 06C, 21B), without any kind of trichomes on abaxial pinnae axes ( Fig. 21A View FIGURE 21 ), both laminar surfaces between veins and on segment’s margins. Ctenitis laetevirens is similar to C. nigrovenia , because both, among the other 1-pinnate-pinnatifid to 1-pinnate-pinnatisect South American species, are the only which segments margin is glabrous. However, in C. nigrovenia , the abaxial laminar surface between veins is with bacilliform trichomes, and on the costa, costule and veins abaxially there are catenate and bacilliform trichomes, the sori usually with indusia, conspicuous, rarely inconspicuous with a tuft of bacilliform trichomes. Specimens of C. laetevirens are usually with dark sori, due to abortive sporangia (Fig. 08F) and consequently their spores are malformed ( Fig. 10C View FIGURE 10 ). Some morphological characters of C. laetevirens are also illustrated in Salino & Morais (2003).