Parablechnum glaziovii (Christ) Gasper & Salino

Dittrich, Vinícius Antonio De Oliveira, Salino, Alexandre, Monteiro, Reinaldo & Gasper, André Luís De, 2018, The fern genera Lomaria, Lomariocycas, and Parablechnum (Blechnaceae, Polypodiopsida) in southern and southeastern Brazil, Phytotaxa 362 (3), pp. 245-262 : 256

Parablechnum glaziovii (Christ) Gasper & Salino in Gasper et al. (2016: 216)

Blechnum glaziovii Christ (1899: 42) . Lectotype (designated here):— BRAZIL. Rio de Janeiro, Petrópolis, 1885, A.F.M. Glaziou 15717 (P00347404). Isolectotypes: P00347401, P00347402, P00347403, BM000769809, K000633399, RB00543443). Fig. 2 D–E .

Plants lithophytic, rarely terrestrial; rhizomes erect, the scales narrowly triangular, tan, concolorous, 12–13 × 1.5–2.6 mm, margins entire, with few denticules; fronds dimorphic, the fertile ones shorter or longer than the sterile, 27–32 cm long, the sterile 24–67cm long; stipes atropurpureous to stramineous, at the base with scales similar to those on rhizomes, towards the apex with scales similar to those on rachis, longer on fertile fronds, of sterile fronds 10.1–12.2 cm long, 1.3–2.6 mm diam., of fertile fronds 16–30 cm long; sterile blades 12–27 × 9.4–16 cm, papyraceous to coriaceous, pinnate, adaxially glabrous, abaxially glabrous or scaly on the costa and veins, ovate to widely ovate, truncate at the base, without vestigial pinnae, truncate at the apex, terminal pinna conform; fertile blades 11–16 × 8.3–10 cm, pinnate, widely ovate or obtrullate, truncate at the base, without vestigial pinnae, truncate at the apex, terminal pinna conform; rachises glabrous or especially at the junction with the pinnae with a few narrowly triangular with expanded bases or linear, tan scales, margin entire or with long projections; bulbils absent; aerophores absent or slightly developed abaxially at the pinnae bases; sterile pinnae 2–12 pairs, 6.1–10 × 1.3–1.7 cm, strongly to slightly ascendant, rarely patent, petiolulate, lanceolate, margins entire or serrulate, plane or revolute, apices acute to acuminate, bases cuneate on both sides, the abaxial costa glabrous or with tan, concolorous scales with expanded bases and filiform apices, on veins with tiny, almost filiform scales with long lateral expansions, otherwise similar to those on the rachis, with or without sparse multicellular hairs on the blade between veins; fertile pinnae 4–7 pairs, 65–88 × 2.1–3.0 mm, linear, strongly contracted, with no green tissue beyond the indusium; veins free, simple or once forked, with strongly clavate ends on the margin.

Distribution and habitat:— Brazil (Amazonas [first record], Minas Gerais, Rio de Janeiro, and São Paulo). Endemic to Brazil, known so far only from southeastern Brazil. Specimens of this species grow on rocks and, sometimes, on soil, in montane areas bordering streams, in well-lit places, between 800 m and 1500 m (outside the study region to 2,060 m), in areas in the realm of Cerrado (campos de altitude or rupestrian fields and riparian forests) and of the Atlantic Forest (tropical rainforest). A relatively common species, not threatened.

Comments: —In the study region, the closest species to P. glaziovii are P. cordatum and P. usterianum . Parablechnum glaziovii is differentiated from the first by the clearly petiolulate and cuneate pinnae (with some degree of adnation at least on the distal pinnae of P. cordatum and with the pinnae bases cordate or subcordate). Also, it is almost restricted to creek edges or on boulders (and clearly a rheophyte). See under P. usterianum for differences from that species.

Christ (1899) cited only a collection (Glaziou 15717) in the protologue of Blechnum glaziovii , and did not designate a holotype. Consequently, we chose the best specimen at P (where the original colletions of Glaziou are housed), annotated as “ holotype ” by T.C. Chambers, as the lectotype.

Additional specimens examined:— BRAZIL. Minas Gerais: Belo Vale, 20°26’37”S, 43°56’10”W, 1300 m, 23 October 2001, Salino 7672 & Carvalho ( BHCB, HRCB) ; Jaboticatubas, Serra do Cipó , 07 August 1972, Hatschbach 30042 ( MBM) ; Lima Duarte, Parque Estadual de Ibitipoca, R.F. Novelino et al. 476 (CESJ, MBM); Mariana, Parque Estadual do Itacolomi, Cibrão , 20°28’04”S, 43°28’50”W, 680 m, 13 February 2006, Rolim 267 & Silva (UB – photo) ; Minduri , Chapada das Perdizes, 21°36’09”S, 44°34’38”W, 1530 m, 31 August 2013, Dittrich 1862 ( CESJ) ; Rio Preto, Serra Negra , 22 January 2006, Souza et al. 147 ( CESJ) ; Santana do Riacho, Estrada de Lagoa Santa a Conceição do Mato Dentro , Serra do Cipó , Alto Palácio, ca. 19°20’S, 43°40’W, 02 February 1987, Prado et al. 77 ( SPF) ; idem, Serra do Cipó, próx. à estátua do Juquinha , 19°15’30”S, 43°33’04”W, 1500 m, 05 July 2001, Souza et al. 25199 ( ESA, HRCB) ; Santo Antônio do Itambé, Parque Estadual do Pico do Itambé, Cachoeira do Neném e trilha entre a cachoeira e Capivari, 18°25’27”S, 43°18’56”W, 1090 m, 04 October 2006, Almeida et al. 517 ( CESJ) ; São Roque de Minas, Parque Nacional da Serra da Canastra, 14 July 1997, Salino 3223 ( BHCB). Unknown municipality: Serra do Cipó , km 132 (ca. 153 km N of Belo Horizonte), 1400 m, 17 February 1968, Irwin et al. s.n. ( MBM 72524 ). São Paulo: Natividade da Serra , Parque Estadual da Serra do Mar , Núcleo Santa Virgínia , base de Vargem Grande, trilha para Cachoeira da Boneca , 23°25’57”S, 45°12’36”W, ca. 800 m, 10 August 2001, Dittrich et al. 908 ( HRCB) ; Salesópolis, Reserva da USP, 23°39’21”S, 45°53’34”W, 870 m, 10 April 2007, Prado & Labiak 1672 (NY – photo) ; São Luís do Paraitinga, Parque Estadual da Serra do Mar , Núcleo Santa Virgínia, trilha da Pirapitinga, ca. 800 m, 29 October 2001, Dittrich et al. 973 ( HRCB) ; São Paulo, Parque Estadual da Serra do Mar, Núcleo de Curucutu, trilha do rio Mambu , ca. 23°59’38”S, 46°46’31”W, ca. 800 m, 13 April 2001, Salino 6552 ( BHCB, ESA, HRCB). Amazonas: Santa Isabel do Rio Negro , Parque Nacional do Pico da Neblina , igarapé Cuiabixi, 0°47’18”N, 66°01’15”W, 2060 m, 20 November 2012, Forzza et al. 7217 (RB, photo) .

Figures

FIGURE 2. A–C. Parablechnum cordatum. A. Habit. B. Scale of sterile frond, abaxial surface of costa. C. Rhizome scale. D–E. Parablechnum glaziovii. D. Habit. E. Rhizome scale. (A–C from Dittrich et al. 1615, CESJ; D–E from Dittrich 1862, CESJ).