Parablechnum marginatum (Kuhn) Gasper & Salino Phytotaxa 275(3): 191-227, 2016.

Molino, Sonia, Lafuente, Irene, Rouhan, Germinal & Medina, Rafael, 2022, Morphological and molecular evidence reject conspecificity of Malagasy and Mascarene Parablechnum (Polypodiopsida, Blechnaceae), PhytoKeys 214, pp. 47-60 : 47

Parablechnum marginatum (Kuhn) Gasper & Salino Phytotaxa 275(3): 191-227, 2016.

Blechnum marginatum ≡ Blechnum marginatum Kuhn, Filic. Afr.: 92, 1868; Blechnum montbrisonis C.Chr. Index Filic. 157, 1905, nom. nov. for Lomaria marginata Fée, Mém. Foug., 5. Gen. Filic.: 71, 1852, nom. illeg. hom., non L. marginata Schrad., Gött. Gel. Anz. 871. 1824 [≡ Lomariopsis marginata (Schrad.) Kuhn].

Type.

Habitat in insulâ Borboniâ, no date, de Montbrison s.n. (not found).

Description.

Plants terrestrial; rhizomes erect, sub-erect or slightly creeping, non-stoloniferous, with ovate to lanceolate scales with elongated apex, more or less filiform, concolorous, brownish, membranaceous, up to 2 cm long; fronds dimorphic; sterile fronds with petioles light brown, grooved adaxially, smooth, up to 50 cm long, with scales in basal zone decreasing in density distally, similar to those of the rhizome, laminae 1-pinnate, elliptic-acuminate, up to 1 m long, sometimes longer, rachises light brown, smooth, adaxially grooved, scales similar to those of petiole, more abundant on adaxial side, pinnae up to 30 pairs, alternate or subopposite, slightly smaller at base, lanceolate to oblong, stalked, becoming basiscopically adnate towards apex of frond, ca. 11 × 2 cm, base asymmetric, subcordate to truncate, apex acute or obtuse, margins slightly serrate, with conforming terminal pinna similar to lateral ones, costae light brown, grooved adaxially, prominent abaxially, with scales at base similar to those of rachis; veinlet simple or 1-furcate, patent, catadromous; fertile fronds larger than sterile ones and more erect, petioles similar to sterile fronds, laminae usually up to 50 cm long, lanceolate to oblong, rachises similar to sterile fronds, pinnae usually in more pairs than in sterile ones, linear, narrow, ca. 3.0 × 0.2 cm, slightly broader-based, asymmetrical, cordate, apex acute; aerophores present in both sterile and fertile fronds, tuberculiform, atropurpureus; hydathodes present in both sterile and fertile fronds, rounded or ovate; sori linear, continuous, on both sides of costa forming coenosori; indusia linear, continuous, opening towards costa, dark brown, membranaceous, usually lacerate.

Taxonomical notes.

Christensen (1905) proposed Blechnum montbrisonis as a replacement name, as the name Blechnum marginatum proposed by Kuhn (1868) was based on an illegitimate basionym, Lomaria marginata Feé. This name was proposed by Feé (1852) after this combination had already been used by Scharder (1824) for what is now known as Lomariopsis marginata (Schard.) Kuhn. However, according to the rules of the current Code (see Art. 6.14 Ex. 18; Turland et al. 2018), Blechnum marginatum would be a validly published replacement name for Lomaria marginata Feé and, therefore, Blechnum montbrisonis would be a superfluous name.