Diploblechnum rosenstockii (Copel.) Gasper & V.A.O.Dittrich, 2016

Gasper, André Luís De, Dittrich, Viníciusantonio De Oliveira, Smith, Alan R. & Salino, Alexandre, 2016, A classification for Blechnaceae (Polypodiales: Polypodiopsida): New genera, resurrected names, and combinations, Phytotaxa 275 (3), pp. 191-227 : 209

6. Diploblechnum rosenstockii (Copel.) Gasper & V.A.O.Dittrich , comb. nov. — Blechnum rosenstockii Copel., Univ. Calif. Publ. Bot. 12. 394. 1931, non Blechnum rosenstockii de la Sota, Darwiniana 18: 254. 1973.

Doodia R.Br., Prodr. Fl. Nov. Holl.: 151. 1810. — Lectotype (designated by J. Smith, Hist. Fil. 309. 1875): Doodia aspera R.Br. Figs. 3I , 6F .

Plants terrestrial; rhizomes erect to ascending, sometimes stoloniferous, slender, clothed with black to brown, lanceolate to linear-lanceolate, entire scales; fronds monomorphic or dimorphic; stipes slender, mostly short, usually dark proximally and stramineous on rachises, scaly, with scales similar to those of rhizomes, usually glabrescent; blades concolorous, linear-lanceolate, lanceolate-acuminate, deeply pinnatifid to pinnate, truncate or with reduced, auriculate pinnae proximally, apices pinnatifid or sub-conform; rachises sometimes with scales; buds absent; aerophores absent; pinnae sessile or adnate, lanceolate, sometimes falcate, ovate to linear, margins serrate-dentate; veins with one or three series of areoles, the first series between veinlets of different forks, the second between veinlets of the same fork and sometimes also like the first series, the third, if present, the same as the first; sori in a single or several rows on both sides of the costae, borne on areolar veins, short and discrete or ±continuous, indusia linear, entire to repand; x = 32.

Species number, comments, and distribution:— About 19 species, in Australia, New Zealand, Pacific Islands to Hawaii. Doodia is characterized by having erect to ascending rhizomes and areolate venation, forming distinct series; fronds are monomorphic or dimorphic. It is closely related to Neoblechnum and Oceanoptris (Gasper et al. in press).

Figures

FIGURE 3. General appearance of the genera of Blechnaceae subfamily Blechnoideae (A-D). A. Austroblechnum penna-marina (FURB06706); B. Blechnidium melanopus (P02439094); C. Blechnopsis orientalis (P01406555); D. Blechnum occidentale (FURB06701); E. Brainea insignis (P01482127); F. Cleistoblechnum eburneum (P00627565); G. Cranfillia fluviatilis (P01606472); H. Diploblechnum fraseri (P01557366); I. Doodia aspera (P01618184). Vouchers are indicated by herbarium barcodes.

FIGURE 6. Habitat of Blechnaceae genera. A. Blechnum occidentale; B. Brainea insignis; C. Cleistoblechnum eburneum. D. Cranfillia vulcanica; E. Diploblechnum fraserii; F. Doodia caudata; G. Icarus filiformis; H. Lomaria spannagelii; I. Lomaridium acutum. Photos from: A. Luis Adriano Funez; B. Ralf Knapp; C. Ralf Knap; D. Julie F. Barcelona; E. Michael Sundue; F. Paulo Araújo; G. WELT herbarium; H. Vinícius A.O. Dittrich; I. Tiago João Cadorin. Reproduced with permission from the authors.