Tectaria wigmanii (Racib.) S.Y. Dong (2014: 227)

Dong, Shi-Yong, 2022, The new combination Tectaria colaniae and notes on the synonymy and distribution of Tectaria wigmanii (Tectariaceae), Phytotaxa 566 (2), pp. 245-248 : 247

Tectaria wigmanii (Racib.) S.Y. Dong (2014: 227) .

Basionym:— Aspidium wigmanii Raciborski (1902: 61) .

= Dryopteris wigmanii (Racib.) Christensen (1905: 301) ; Heterogonium wigmanii (Racib.) Holttum (1955: 271) .

Type:— INDONESIA. Java: Bogor, Cult. Hort. Bot. 2K.XI.13 (lectotype, BO, designated by Holttum 1975: 216, not seen; isolectotype, L-0051702!), original from Aru Islands , Indonesia .

Other synonym:— Dryopteris sagenioides var. gurupahensis Christensen (1922: 95) .

= Dryopteris gurupahensis (C. Chr.) Christensen (1934: 45) ; Heterogonium gurupahense (C. Chr.) Holttum (1955: 272) .

Type:— INDONESIA. North Sulawesi (formerly Celebes): Gurupahi, Bolaang-Mongondou , in primary forest, 600 m, 7 April 1917, W. Kaudern 18 (lectotype, designated here, S-P-10859!; isolectotype, BM-001048664!) .

When publishing Dryopteris sagenioides var. gurupahensis, Christensen (1922: 95) cited two numbers of Kaudern’s collections, 17 and 18, as the type; these two are syntypes according to Art. 9.6 of the ICN ( Turland & al. 2018). The syntype Kaudern 18 kept in S (barcode S-P-10859) is here designated as the lectotype. As the type of this taxon agrees with the type of T. wigmanii (then named Heterogonium wigmanii ), Holttum (1975) treated them as representatives of a single species.

As mentioned by Holttum (1975), T. wigmanii is morphologically very similar to T. sagenioides but differs by the larger size of fronds, which are up to 50–75 (versus 30–40) cm long. The two species are thought to have different distribution, namely, T. wigmanii is confined to Sulawesi and Maluku, Indonesia, whereas T. sagenioides occurs in Philippines, West Malesia, and northwards to Indochina and Hainan Island ( Holttum 1975, 1991). So Heterogonium gurupahense recorded in Thailand ( Tagawa & Iwatsuki 1988) and in Vietnam ( Phan 2010) should be corrected to be T. sagenioides . It seems to me that there is no significant difference between T. wigmanii and T. sagenioides besides the larger frond size and the clear dimorphism (fertile fronds obviously contracted) in T. wigmanii . Further studies, especially chromosome counting and molecular phylogenetic analyses, are needed to confirm the taxonomic identity of T. wigmanii .