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| Adiantum viscosum A. Cádiz-Véliz & A.E. Villarroel, in Cádiz-Véliz, Palma-Villalobos, Villarroel et Muñoz-Schick, 2023. |
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
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| 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
