A taxonomic monograph of the fern genus Ctenitis (Dryopteridaceae) in South America Author Viveros, Raquel Stauffer Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Departamento de Botânica, Caixa Postal 486, 30123 - 970, Belo Horizonte, Minas Gerais, Brazil Author Rouhan, Germinal Muséum National d’Histoire Naturelle, UMR 7205 CNRS-MNHN-UPMC-EPHE, Institut de Systématique, Evolution, Biodiversité - ISYEB, Sorbonne Universités, Herbier National, 16 rue Buffon, CP 39, F- 75231 Paris cedex, France Email: raquel. s. viveros @ gmail. com raquel.s.viveros@gmail.com Author Salino, Alexandre Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Departamento de Botânica, Caixa Postal 486, 30123 - 970, Belo Horizonte, Minas Gerais, Brazil text Phytotaxa 2018 2018-01-23 385 1 448 450 http://dx.doi.org/10.11646/phytotaxa.385.1.1 journal article 10.11646/phytotaxa.385.1.1 1179-3163 13705270 6. Ctenitis christensenii R.S. Viveros & Salino (2015: 2) . Figs. 02B, 03A, 09E, 16 B. Type :— BRAZIL . Espírito Santo : Sooretama , Reserva Biológica de Sooretama , região da Lagoa do Macuco , 38 m , 19º01’36”S , 39º56’10”W , 15 May 2008 , Salino , Heringer , Dittrich & Viveros 13408 ( holotype BHCB 026912 !, isotype UC!, P!). Stems erect or ascending, 0.8–1.6 cm diam., scales 1.0–7.0 × 0.1–0.6 mm , castaneous, subclathrate, linear-lanceolate, entire or slightly denticulate, without fimbriae; leaves (25) 30–87 cm long; petioles (11) 16–47 cm × 0.9–2.3 mm , with 4 vascular bundles at base, stramineous, scales 1.6–5.5 × 0.1–0.6 mm , castaneous, subclathrate, not tangled on petiole base, patent or ascending, flattish, flaccid, linear-lanceolate with truncate, rounded or slightly cordate base and filiform apex, entire or slightly denticulate, with some short fimbriae at base and laterally, sparse catenate trichomes abaxially, rare or absent glandular trichomes; laminae 14–40 × 9–18 cm , width ca. 1/2 of length or wider, 1-pinnate-pinnatisect basally, 1-pinnate-pinnatifid medially and apically, lanceolate or ovate, apex confluent; rachises stramineous, scales like those on distal portion of petioles, sparse catenate trichomes abaxially, rare or absent glandular trichomes; pinnae (4) 7–11 pairs, the basal and medial ones stalked to 1.6 mm long or sessile, the apical ones sessile, basal pinnae basiscopically and acroscopically somewhat equally developed, the medial 4.0–8.5 × 1.0– 2.2 cm , lanceolate, incised more than 3/4 of the distance between the segment apex and costa, basal segments somewhat shorter than the next, apex attenuate or acuminate; adaxial pinnae axes scales absent, catenate trichomes dense on costa, sparse on costule and veins, bacilliform trichomes absent; adaxial laminar surface between veins glabrous; abaxial pinnae axes with sparse scales on costa, 0.5–1.8 × 0.05–0.20 mm , castaneous, subclathrate or clathrate, ascending, flattish, flaccid, linear-lanceolate with truncate or rounded base and filiform apex, entire or slightly denticulate, without fimbriae, proscales to 0.6 mm long sparse on costa and costule, catenate trichomes sparse on costa, costule and veins, bacilliform trichomes sparse on costule and veins, glandular trichomes absent or rare on costa, filiform trichomes absent; abaxial laminar surface between veins glabrous or with sparse filiform trichomes and bacilliform trichomes; segments 11–15 pairs, 3.2–5.8 mm wide, patent or subfalcate, entire or crenate, apex obtuse, margin with catenate trichomes, the distance from each other is narrower than segments width; veins simple, (3) 6–9 pairs per segment, the basal ones from adjacent segments end at margin well above the sinus; sori medial or supramedial, indusia conspicuous, entire, with bacilliform trichomes; spores with inflated folds and large tubercles. A TAXONOMIC MONOGRAPH OF CTENITIS IN SOUTH AMERICA Phytotaxa 335 (1) © 2018 Magnolia Press • 35 Selected specimens examined :— BRAZIL . Bahia : Jussari , RPPN Serra do Teimoso , 15º09’15.8”S , 39º31’24.2”W , 2 October 2002 , Salino 8200 ( BHCB ) ; Espírito Santo : Cachoeiro do Itapemirim , Floresta Nacional de Pacotuba , 115 m , 20°44'19" S , 41°16'39" W , 27 October 2009 , Salino & Viveros 14573 ( BHCB ) ; Castelo , Parque Estadual Mata das Flores , 120 m , 20°36'49" S , 41°10'05" W , 24 June 2008 , Salino et al. 13469 ( BHCB ) ; Itarana , Jatiboca. Fazenda do Sr. Stur , 274 m , 19°57'30" S , 40°53'09" W , 26 August 2009 , Salino et al. 14476 ( BHCB ) ; Linhares , Floresta Nacional de Goytacazes , 15 m , 19°26'07" S , 40°04'26" W , 14 May 2008 , Salino et al. 13367 ( BHCB ) ; Nova Venécia , APA da Pedra do Elefante , Fazenda Neblina , 300 m , 18°47'13" S , 40°26'44" W , 15 January 2009 , Labiak et al. 5122 ( RB ) ; Pinheiros , Reserva Biológica do Córrego do Veado , 50 m , 18°22'13" S , 40°09'26" W , 9 June 2009 , Salino et al. 14281 ( BHCB ) ; Sooretama , Reserva Biológica de Sooretama , 20 m , 19º01’21”S , 39º58’28”W , 12 May 2008 , Salino et al. 13326 ( BHCB ) ; Minas Gerais : Governador Valadares , Campo de Sementes , 26 November 1941 , Magalhães 825 ( BHCB ) ; Juiz de Fora , Fazenda Boa Esperança , 29 September 1937 , Brade 15912 ( RB ) ; Marliéria , Parque Estadual do Rio Doce , 6 December 1996 , Salino 2856 ( BHCB ) ; São José do Mantimento , Margens do Rio José Pedro , 340 m , 19°59'08" S , 41°43'21" W , 5 September 2009 , Almeida et al. 2073 ( BHCB ) ; Sobrália , Fazenda Santa Luzia , 145–150 m , 19º12’34.2”S , 42º11’54.3”W , 7 September 2004 , Salino 9698 ( BHCB ) ; Tombos , Fazenda da Cachoeira , 10 July 1935 , Mello Barreto 1526 ( RB ) ; Rio Pomba , June 1909 , unknown, s.n. ( OUPR ) ; Rio de Janeiro : Cambuci , Três Irmãos , 10 May 1949 , Alameida s.n. (R); Campos dos Goytacazes , Morro do Coco , Mata da Solidão , 6 December 2005 , Mynssen et al. 875 ( RB ) ; Saquarema , 20 August 2014 , Bello et al. 113 ( RB ) . Habitat and distribution :—Terrestrial or rarely epipetric in semideciduous forest and rainforest, especially “tabuleiro” forest, 15–790 m . Endemic to northeastern and southeastern Brazil ( Viveros & Salino 2015 ; Fig.16B ; Tab. 01). Notes :— Ctenitis christensenii can be recognized mainly by its sparse castaneous linear-lanceolate scales on costa abaxially with truncate or rounded base, laminar surface between veins abaxially glabrous or with sparse bacilliform and filiform trichomes, adaxially glabrous, and indusia entire with bacilliform trichomes. Such morphological characters of C. christensenii and comparison notes with the most similar species ( C. bigarellae and C. paranaensis ) to it are in Viveros & Salino (2015) . See also the notes about C. bigarellae .