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X. On the structure and affinities of dipteris , with notes on the geological history of the dipteridinæ

1901; Royal Society; Volume: 194; Issue: 194-206 Linguagem: Inglês

10.1098/rstb.1901.0011

2053-9266

Albert Charles Seward, Elizabeth Dale,

Plant Diversity and Evolution

The name Dipteris was first used by Reinwardt as a generic designation for a fern, which he named Dipteris conjugata , and defined as “ Filix elegans, frondes duse, in stipite communi elongato terminales, palmato-laciniatse, dichotomo-nervosae.” Blume, in his Enumeratio Plantarum Javæ,’ speaks of this species as Polypodium Dipteris , and Kaulfuss adopts the same name. The ‘ Flora Javæ ’ by Blume and Fischer contains a good drawing of the rhizome and leaves of Polypodium Dipteris , the sporangia being represented as possessing the typical Polypodiaceous annulus. In the ‘ leones Filicum ’ of Hooker and Greville there is a coloured plate of an Indian fern described as Polypodium Walichii , a name first used by Robert Brown in the MS. list of species in the Wallich Herbarium (No. 287). The same plant is referred to by Wallich as Polypodium maerocheiros . In 1837, Kunze published a fairly satisfactory figure of a small frond of Polypodium Conjugatum. It is in the ‘ Plantæ Javanicæ Rariores’ that we find the most complete diagnosis of the species originally named by Reinwardt Dipteris conjugata ; in this work Robert Brown describes the Javan fern as Polypodium (Dipteris) Horsfieldii , using the term Dipteris as a sub-genus of Polypodium . He describes the characters of the sub-genus Dipteris follows :—“ Sori subrotundi, sparsi (v. transversim subseriati) inter (frondis palmatae) venas primarias dichotomas earumque divisiones, venulis divaricatissimis anastomosantibus insidentes. Indusium (verum) nullum. Caudex repens teres. Frondes elongato-stipitatæ binatse; partiales dimidiatae palmatolobatæ. Venulæ secundarise tertiariæ et ultimæ divaricatissimæ, crebre anastomosantes, penultimæ latere soriferæ, ultimae apice vix dilatato libero. Indusium sporium vel (in D. Horsjieldii ) pili sorum cingentes et capsulis intermixti; vel (in D. Wallichii ) materia pulposo-gummosa capsulas immaturas obtegens.”