Crutarndina
single-species lichen genus
Crutarndina is a monotypic fungal genus in the family Graphidaceae. It contains the single species Crutarndina petractoides, a corticolous (bark-dwelling), crustose lichen.
Taxonomy
The sole species of Crutarndina was first formally described in 1995 by Per Magnus Jørgensen and Irwin Brodo, who originally classified it in the genus Thelotrema. Sittiporn Parnmen, Robert Lücking, and H. Thorsten Lumbsch circumscribed the genus Crutarndina in 2012 to contain the species after molecular phylogenetics analysis showed that it represented a unique lineage.
The genus name Crutarndina honours the eminent British lichenologist Peter Crittenden from Nottingham, who assisted in collecting the type material during a field excursion organized by the British Lichen Society. The surname Crittenden originates from Old British and Welsh, translating to "the cot on the lower hill," combining "cru" (cot), "tarn" (lower), and "dun" or "din" (hill).
Description
Crutarndina is distinguished from the closely related genus Thelotrema primarily by its unique apothecial structure. In Crutarndina, the fruiting bodies (apothecia) have star-like, multi-layered margins, which differ significantly from those observed in Thelotrema. The thallus, or body, of Crutarndina lichens lacks a cortex, meaning it does not have a protective outer layer. The apothecia are erumpent, meaning they break through the thallus surface as they develop, and they are generally rounded in shape.
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This entry incorporates text from “Crutarndina” 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.