Species of lichen
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Aderkomyces thailandicus is a species of corticolous (bark-dwelling), crustose lichen in the family Gomphillaceae. Found in the lower montane rainforests of Thailand, it was described as new to science in 2011.
Taxonomy.
"Aderkomyces thailandicus" was first formally described by lichenologists Khwanruan Butsatorn Papong, Kansri Boonpragob, and Robert Lücking as a new species in 2011. The name of the species is derived from the country where it was discovered. The type specimen was collected by the first author in February 2006 at Huai Nam Dung National Park in Chiang Mai Province, Thailand.
Description.
"Aderkomyces thailandicus" is an ;dfn id="" ;epiphyllous ;/dfn ; lichen with a crustose, ;dfn id="" ;verrucose ;/dfn ; thallus, or vegetative body. It has a greenish-grey colour, and the thallus is 10–15 μm thick. The lichen also features white, long sterile ;dfn id="" ;setae ;/dfn ;, which are hair-like structures, measuring 2–2.5 mm in length.
The lichen's apothecia, or spore-producing structures, are initially immersed- ;dfn id="" ;erumpent ;/dfn ; with thin marginal ;dfn id="" ;lobules ;/dfn ;, but they eventually become broadly sessile to adnate with a slightly prominent margin. The apothecia are light grey-brown, sometimes with an orange tinge, and range from 0.2 to 0.5 mm in diameter.
The ;dfn id="" ;excipulum ;/dfn ;, a tissue surrounding the hymenium, comprises radiating hyphae embedded in a gelatinous matrix and is colourless. The hymenium, the fertile layer containing asci and ;dfn id="" ;paraphyses ;/dfn ;, is also colourless and measures 35–50 μm in height. The asci, or spore-producing sacs, are ;dfn id="" ;annelasceous ;/dfn ;, ;dfn id="" ;clavate ;/dfn ;, and colourless. They measure 35–40 by 18–20 μm and contain 2–4 ellipsoid, ;dfn id="" ;muriform ;/dfn ;, and colourless ascospores, which are 17–22 by 12–14 μm in size. No secondary chemical substances were detected in the lichen using thin-layer chromatography.
This species is recognized by its initially immersed-erumpent apothecia, which are similar to those found in several "Gyalideopsis" species, and its combination of verrucose thallus and submuriform ascospores with 2-4 per ascus. No other "Aderkomyces" species has a similar combination of characteristics, making "Aderkomyces thailandicus" distinct from its relatives. Although the neotropical "A. gomezii" shares some similarities, it differs by having a smooth thallus and larger ascospores. Additionally, "Aderkomyces thailandicus" differs from "Gyalideopsis" species due to the presence of sterile setae, which are absent in "Gyalideopsis".
Habitat and distribution.
"Aderkomyces thailandicus" is known from several collections originating from the lower montane rainforests of Thailand. It tends to grow in the understory of these forests, specifically in areas with more light. "A. armatus" is the only other species of "Aderkomyces" known to occur in Thailand.
References.
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