Zwackhia viridis
species
Zwackhia viridis is a species of corticolous (bark-dwelling), script lichen in the family Lecanographaceae. It has a cosmopolitan distribution, and has been documented in Africa, Asia, the Americas, Europe, and Oceania.
Taxonomy
The lichen was first formally described by the Swedish lichenologist Erik Acharius, as Opegrapha rubella var. viridis. Ignaz Poetsch and Karl Schiedermayr transferred it to the genus Zwackhia in 1872.
Description
Zwackhia viridis is characterised by a subtle and svelte thallus that can range from being barely noticeable to a fine texture. Its colour spectrum includes shades of pale brown, grey, greenish-grey, brownish-grey, and green, all in a matte finish. On occasion, a prothallus can be observed, distinguishable by its dark brown hue and a width spanning 0.1–0.2 mm.
The ascomata (spore-producing structures) are dispersed relatively evenly across the thallus, though sometimes they appear in clusters of two to four. These structures are lirelliform (slit-like) in shape, generally straight, but can also have curved or slightly flexuous patterns.
The public source identifies “Zwackhia viridis” as species. This brief keeps that definition visible, then builds a research path around Zwackhia, viridis and species.
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A short description can identify a subject without explaining its stakes. For “Zwackhia viridis”, the useful work is to connect “species” to the records capable of establishing context and consequence.
The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Nov 27, 2025. The linked authority identifier is Q70773842. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1872.
Current terminology should not be projected backward without checking the classification used when the underlying evidence was created. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Zwackhia viridis” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.