Fungalpedia – Note 2034, Extremaceae
Extremaceae. Quaedvl. & Crous.
Citation when using this data: Hongsanan S et al. 2020 – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank
Classification: Mycosphaerellales, Dothideomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi
Mostly rock-inhabiting. Asexual morph: Coelomycetous or hyphomycetous. When Coelomycetous (Staninwardia), Mycelium immersed, sparse, composed of pale brown septate hyphae. Conidiomata acervular, formed in the epidermis and hypodermis, erumpent with the basal wall formed of pale brown, smooth-walled pseudoparenchymatic cells. Conidia catenate, basipetal, pale brown, 1-septate, verruculose, both ends truncate except for the terminal conidium which is obtuse at the apex, formed in a mucilaginous sheath. When hyphomycetous, variable, filamentous, lichenicolous or yeast-like. Conidiophores micronematous to macronematous, subcylindrical to cylindrical, brown, septate, straight or flexuose. Conidiogenous cells monoblastic or polyblastic, integrated, terminal or lateral, brown, subcylindrical to ellipsoid or doliiform, scars somewhat darkened and thickened, slightly reflective or not. Conidia various in shapes, solitary or in chains, subhyaline to dark brown, aseptate or septate, smooth to slightly verruculose, sometimes with hila. Sexual morph: Undetermined.
Notes – Extremaceae was introduced by Quaedvlieg et al. (2014) and validated by Crous et al. (2019b). Quaedvlieg et al. (2014) originally included five genera. Isola et al. (2016) introduced Saxophila to this family based on morphology and phylogeny. Most of the species in Extremaceae are rock-inhabiting taxa. However, there are also saprobic species, such as Pseudoramichloridium henryi. In addition, some taxa were isolated from soil, for example P. brasilianum and P. xinjiangens (Arzanlou et al. 2007, Jiang et al. 2017).
Paradevriesiaceae was introduced by Crous et al. (2019b) and contained Paradevriesia compacta (CBS 118294), P. americana (CBS 117726), and P. pseudoamericana (CPC 16174). They form lineages within Extremaceae in our phylogenetic tree. This is because Crous et al. (2019b) did not include sequence data of Extremaceae in their phylogenetic tree. Thus, Paradevriesiaceae is synonymized under Extremaceae here.
Type genus: Extremus Quaedvl. & Crous.
Other accepted species: Species Fungorum – search Extremaceae.
References
Entry by
Sinang Hongsanan, Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Science and Oceanography, Shenzhen University, Shenzhen 518060, People’s Republic of China, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50002, Thailand
Published online 23 March 2026