Tongue fern (Pyrrosia adnascens)

Pakis lidah or tongue fern (Pyrrosia adnascens) is a plant species in the Polypodiaceae, a long creeping rhizome, up to 1 mm thick, in cross-section usually with a single central sclerenchyma strand, the distance between phyllopodia is 1-2 cm and lateral shoots alternate with phyllopodia.

P. adnascens has peltate scales, 3-5x1 mm, all over the base to the ciliate. Light brown tips, often with distinct hyaline and ciliate margins. Dimorphic midrib. The sterile frond has a stalk of 1-1.5 cm. Lamina 1-6x1-2 cm, cuneate base and rounded tip.

The fertile midrib gradually narrows at the base to the stem for a length of 5 cm. Lamina 8-25-0.45-0.8 cm, blunt tip to acute. Hydathodes appear rarely, few and are not clear. Monomorphic indumen but rarely, whitish to brown in color. Long hair 0.2-1.2 mm. Sori sinks with the central bundle of paraphyses.

Tongue fern grows on the trunks of living trees, dead trees and rocks at an altitude of 0-1300 m. Generally grows in humid areas and can withstand drought for up to 6 months. The whole plant is used in traditional Chinese medicine.

Kingdom: Plantae
Phylum: Tracheophyta
Class: Polypodiopsida
Subclass: Polypodiidae
Order: Polypodiales
Suborder: Polypodiineae
Family: Polypodiaceae
Subfamily: Platycerioideae
Genus: Pyrrosia
Species: Pyrrosia adnascens
Form: Pyrrosia adnascens f. adnascens, Pyrrosia adnascens f. calcicola

Six new species forming the Sumbana species group in genus Nemophora Hoffmannsegg 1798 from Indonesia

NEWS - Sumbawa longhorn ( Nemophora sumbana Kozlov, sp. nov.), Timor longhorn ( Nemophora timorella Kozlov, sp. nov.), shining shade longhorn ( Nemophora umbronitidella Kozlov, sp. nov.), Wegner longhorn ( Nemophora wegneri Kozlov, sp. nov.), long brush longhorn ( Nemophora longipeniculella Kozlov, sp. nov.), and short brush longhorn ( Nemophora brevipeniculella Kozlov, sp. nov.) from the Lesser Sunda Islands in Indonesia. The Lesser Sunda Islands consist of two parallel, linear oceanic island chains, including Bali, Lombok, Sumbawa, Flores, Sumba, Sawu, Timor, Alor, and Tanimbar. The oldest of these islands have been continuously occurring for 10–12 million years. This long period of isolation has allowed significant in situ diversification, making the Lesser Sundas home to many endemic species. This island chain may act as a two-way filter for organisms migrating between the world's two great biogeographic regions, Asia and Australia-Papua. The recognition of a striking cli...

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