Species of lichen
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Fauriea trassii is a lichen species in the family Teloschistaceae, described in 2011. It is primarily found in the Far East of Russia, particularly in the Primorsky Krai region.
Taxonomy.
"Fauriea trassii" was identified and formally description by the lichenologists Irina Galanina and Sergey Kondratyuk. The type specimen was collected by the first author near the Kiewka settlement in the Lazo district in a "Quercus mongolica" forest. The species is named in honour of Estonian lichenologist and phytosociologist Hans Trass, acknowledging his contributions to the knowledge of Eurasian lichens and plant communities. The taxon was transferred to the genus "Fauriea" in 2020 by Kondratyuk and Yoshikazu Yamamoto.
Description.
The thallus of "Fauriea trassii" ranges from 5–10 mm in width, with a somewhat uneven surface, and can have highly elevated ;dfn id="" ;verrucae ;/dfn ;. The thallus is dark grey or brownish-grey, and each verruca typically houses 3–5 apothecia. The ;dfn id="" ;hypothallus ;/dfn ; is usually not visible, but a black line may be present when bordering other crustose lichens.
Apothecia are 0.3–0.7 mm in diameter and about 0.17 mm thick. They are usually immersed in thalline verrucae, later becoming sessile and ;dfn id="" ;lecanorine ;/dfn ; with a grey or brownish-grey margin. The ;dfn id="" ;disc ;/dfn ; of the apothecia is brown to dark brown or cherry-blossom brown. The ;dfn id="" ;thalline exciple ;/dfn ; is up to 72 μm wide, and the ;dfn id="" ;true exciple ;/dfn ; is 24–36 μm wide in the upper portion, thinning out towards the base. The hymenium is 70–80 μm high, and the ;dfn id="" ;epihymenium ;/dfn ; is brownish or dirty yellowish-brown. ;dfn id="" ;Ascospores ;/dfn ; have an elongated ellipsoidal shape, and typically measure 12–17 by 5.5–7.5 μm.
The thallus and epihymenium of "Fauriea trassii" do not react to the potassium hydroxide (K) spot test, or show a greenish-brown reaction that becomes paler over time.
Similar species.
"Fauriea trassii" is distinguished from similar species like "Parvoplaca suspiciosa" and "Caloplaca diphasia" by features such as its thinner cortical layer in the thalline exciple, paraphyses of uniform thickness, longer ascospores, and the absence of an algal layer below the apothecium. It also differs from "Caloplaca brunneola", "Obscuroplaca camptidia", "Obscuroplaca ochrolechioides", and "Caloplaca yammeraensis" by various morphological traits. Additionally, "F. trassii" is superficially similar to "Lecanora subfusca" group species but can be differentiated by spore morphology and measurements.
Habitat and distribution.
"Fauriea trassii" is known from several locations in the Far East of Russia. It is thought to be more common than previously recognized, having been often mistaken for a species of "Lecanora". This species grows on the bark of "Quercus mongolica" trees, commonly found about from the sea shore in the Primorsky region.
References.
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