Fungalpedia – Note 2671, Arthrorhaphis
Arthrorhaphis Th. Fr.
Citation when using this data: Meng QF et al. – Fungalpedia.
Index Fungorum, Faceoffungi, MycoBank, GenBank, Fig 1.
Classification: Arthrorhaphidaceae, Baeomycetales, Ostropomycetidae, Lecanoromycetes, Pezizomycotina, Ascomycota, Fungi.
Arthrorhaphis was established by Fries (1861) to accommodate the type species A. flavo-virescens. This genus is morphologically and biologically diverse, comprising both lichenized and lichenicolous fungi. Of the 15 known species, seven are strictly lichenicolous, while three are facultative lichenicolous lichens. Based on the phylogenetic study, Frisch et al. (2022) placed this genus within Arthrorhaphidaceae.
Arthrorhaphis anziana, is not listed in Species Fungorum (2025), is recognized as Bacidia anziana Lynge in MycoBank, However, this name actually serves as the basionym of A. anziana. In checklist of Hawksworth (1972), it is noted to grow on other lichens, and thus we have included this species in our list. Arthrorhaphis fuscoreagens was transferred from Lecidea fuscoreagens Vain. by Poelt (1969). Although it is labeled as a synonym of A. grisea in Index Fungorum (2025) and MycoBank (2025), we found no literature to support the reinstatement of the older species. Arthrorhaphis viridescens Rabenh., not listed in Species Fungorum (2025), is still considered a valid name and should be included in the list. To date, 15 species are recognized in this genus: seven are strictly lichenicolous, three are facultative lichenicolous, and the rest are lichenized.
Type species: Arthrorhaphis flavovirescens (A. Massal.) Th. Fr.
=Catolechia flavovirescens Flot.
Other accepted species: Species Fungorum – search Arthrorhaphis
Figure 1 – Arthrorhaphis citrinella redrawn from Obermayer (1994) and Frisch et al. (2022). a Section of ascomata. b Asci. c Ascospores. Scale bars: a = 100 μm, b = 20 μm, c = 10 μm.
References
Fries TM 1861 – Lichenes arctoi Europae Groenlandiaeque hactenus cogniti. Leffler, 3, 1–298.
Hawksworth DL. 1972 – Lichens 1961–1969. Index of Fungi Supplement, 1–78.
Poelt J, Vezda A 1969 – Bestimmungsschlüssel europäischer Flechten. Cramer, 1–757.
Entry by
Meng QF, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand and School of Public Health, Zunyi Medical University, Guizhou 563000, China.
Published online 8 July 2026