Gyalideopsis pseudoactinoplaca
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| Gyalideopsis pseudoactinoplaca | |
|---|---|
Scientific classification  | |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Graphidales |
| Family: | Gomphillaceae |
| Genus: | Gyalideopsis |
| Species: | G. pseudoactinoplaca |
| Binomial name | |
| Gyalideopsis pseudoactinoplaca Lücking & Chaves (2006) | |
 Holotype: Tenorio Volcano National Park, Costa Rica | |
Gyalideopsis pseudoactinoplaca is a species of corticolous (bark-dwelling) crustose lichen in the family Gomphillaceae.[1] The pale greenish-grey lichen forms thin, slightly shiny crusts on bark and rotting logs in cloud forest environments, and is currently known only from Costa Rica's Tenorio Volcano National Park. Unlike many lichens, it has not been observed to produce typical cup-like reproductive structures (apothecia), instead reproducing through unusual spherical, stalkless specialized structures that sit directly on the surface, which researchers believe represent an evolutionary simplification of typical reproductive structures through complete reduction of supporting elements.
Gyalideopsis pseudoactinoplaca was described in 2006 by the lichenologists Robert Lücking and José Luis Chaves. The species epithet pseudoactinoplaca refers to the resemblance of its reproductive structures to those of Actinoplaca strigulacea, another lichen species. The type specimen was collected in Costa Rica, in the province of Alajuela, within the Cordillera de Tilarán. It was found in Tenorio Volcano National Park, part of the Arenal-Tempisque Conservation Area, at the Pilón Biological Station. The specimen was collected at an elevation of 700 m (2,300 ft) in the lower montane cloud forest zone, where it was found on wet, rotting logs in exposed areas, including trees and fence posts along pasture.[2]
Although the species was described within the genus Gyalideopsis, its exact classification is somewhat tentative because traditional reproductive structures (apothecia) have not been observed. However, researchers placed it in Gyalideopsis based on the anatomical features of its specialized fungal filaments (diahyphae). While superficially resembling Actinoplaca strigulacea, microscopic examination reveals that the anatomy of G. pseudoactinoplaca is more consistent with other Gyalideopsis species, such as G. krogiae and G. lambinonii.[2]
The researchers concluded that the similarity to Actinoplaca is a case of convergent evolution rather than a close relationship, with the reproductive structures of G. pseudoactinoplaca representing an evolutionary simplification of the typical Gyalideopsis-type reproductive structures through complete reduction of the stalk and other supporting elements.[2]