[Botany • 2023] Adiantum viscosum (Pteridaceae) • A New Species endemic to sclerophyllous forest of Central Chile

Adiantum viscosum A. Cádiz-Véliz & A.E. Villarroel, 

in Cádiz-Véliz, Palma-Villalobos, Villarroel et Muñoz-Schick, 2023. 

DOI: 10.11646/phytotaxa.599.3.5 

 Researchgate.net/publication/371348831

 

Abstract

Adiantum viscosum (Pteridaceae) is a new species of fern endemic to Central Chile that inhabits the sclerophyllous forest of the Valparaíso Region. Adiantum viscosum is morphologically similar to A. gertrudis and A. glanduliferum, but it differs by the presence of capitate and glandular trichomes throughout the aerial portion of the plant (pinnules, rachis, petioles and petiolules), which produce a sticky and aromatic resin. We provide a description of the species based on morphological analysis, insights about its ecology and habitat, distribution map, illustrations, a proposal for a conservation category according IUCN criteria, and a taxonomic key to the species of the genus Adiantum present in Chile.

Keywords: ferns, biodiversity hotspot, mediterranean flora, taxonomy, Pteridophytes

Adiantum viscosum;
 (A) habit; (B) frond; (C) fertile frond; (D) detail of a fertile pinnule and false indusia; (E) detail of rachis covered with trichomes; (F–G) details of a pinnule covered with glandular and capitate trichomes; (H) detail of petiole and scales.

Photographs: A. Cádiz-Véliz.

Adiantum viscosum A. Cádiz-Véliz & A.E. Villarroel, sp. nov.  

Diagnosis: — Adiantum viscosum differs from A. gertrudis and A. glanduliferum by the presence of capitate and glandular trichomes covering the entire aerial part of the plant, including pinnules, rachis, petioles and petiolules, which produce a sticky and aromatic resin.

Etymology:— The specific epithet refers to the viscous resin produced by the glandular trichomes.

Arón Cádiz-Véliz, Bárbara Palma-Villalobos, Alejandro E. Villarroel and Mélica Muñoz-Schick. 2023. Adiantum viscosum (Pteridaceae), A New Species endemic to sclerophyllous forest of Central Chile.  Phytotaxa. 599(3); 183-192. DOI: 10.11646/phytotaxa.599.3.5 

 Researchgate.net/publication/371348831_Adiantum_viscosum_a_new_species_endemic_to_sclerophyllous_forest_of_Central_Chile

[Botany • 2022] Pteris pseudoamoena (Pteridaceae) • A New Species from Guangxi, China and Vietnam

Pteris pseudoamoena D. M. Yang & R. Guo,
  

in Guo, Wang, Zhang, ... et Yang, 2022. 

拟红杆凤尾蕨  ||  DOI: 10.11646/phytotaxa.550.3.1 

 

Abstract

A new species of fern, Pteris pseudoamoena (Pteridaceae), was identified and characterized. It is currently found in Guangxi Province, China, and Vietnam. Pteris pseudoamoena shares similar morphological characters with P. amoena and P. mcclurei, but can be distinguished by spores with echinate-tuberculate and auriculate ornamentation, straw-colored stipes, rachises and costae, and mostly free, occasionally interlinked veins. In addition, molecular evidence indicated that the new species is sister to a clade consisting of P. amoena, P. nakasimae and P. mcclurei.

Keywords: morphology characters, phylogeny, Pteris, taxonomy, Pteridophytes 

 The habitat and morphology of Pteris pseudoamoena.
 A. An individual with long apices of pinnae growing in a jungle on a calcareous hill; B. An individual with short apices of pinnae growing in a jungle on a calcareous hill; C. An individual growing in a calcareous rock crevice; D. An individual with two pairs of basiscopic pinnules at basal pinnae (J. M. Wang 20150131-4 A7); E. The abaxial side of a fertile frond; F. Segments of a fertile frond with interlinked veins indicated by arrows; G. Stipes with scales at base; H. Calcareous hills in Xialei Town, Daxin County, Guangxi Province, China.

 (photographed by Hong-Jin Wei except D)

 Line drawing of Pteris pseudoamoena D. M. Yang & R. Guo.
A. Sterile frond; B. Fertile frond; C. Sterile segment; D. Fertile segment showing occasional interlinking of veins.

Drawn by Yun-Xiao Liu 

based on the holotype J. M. Wang 20150130-2 (IBSC). 

Pteris pseudoamoena D. M. Yang & R. Guo, sp. nov. 

 

Diagnosis:— Morphological features of the new species are similar to those of P. amoena Blume (1828: 210) and P. mcclurei Ching (1933: 28) with tripinnatifid laminae, but differ by having spores with echinate-tuberculate and auriculate ornamentation, strawcolored stipes, rachises and costae, free veins but occasionally interlinked veins, while P. amoena having spores with tuberculate and verrucate ornamentation, castaneous-brown to sorrel-red stipes, rachises and costae, and free veins, and P. mcclurei having spores with rugulate ornamentation, castaneous-brown to lightly brown stipes, rachises and costae, and interlinked veins ( Table 2, Figs. 2 & 3).

 

Distribution and Habitat:— Pteris pseudoamoena is currently found in Longzhou County and Daxin County of Guangxi Province, China, and in Kim Hy Nature Reserve of Bac Kan, Vietnam. It grows in calcareous hills with elevation 216– 600 m.

Etymology:— The specific epithet refers to the most similar species Pteris amoena of the new species.

Common name (assigned here):— Ni Hong Gan Feng Wei Jue 

(拟红杆凤尾蕨; Chinese name).

Rui Guo, Jia-Mei Wang, Wen Zhang, Dan He, Jing Yu and Dong-Mei Yang. 2022. Pteris pseudoamoena (Pteridaceae), A New Species from Guangxi, China and Vietnam. Phytotaxa. 550(3); 215-223. DOI: 10.11646/phytotaxa.550.3.1 [2022-06-16]