Fungalpedia – Note 583, Rhagadolobiopsis
Rhagadolobiopsis Guatim. & R.W. Barreto
Citation when using this data: Zhang et al. 2025 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig. 1
Classification: Parmulariaceae, Asterinales, Dothideomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi
Guatimosim et al. (2014a,b) established a new genus, Rhagadolobiopsis in Parmulariaceae (Parmulariales, Dothideomycetes, Ascomycota) to accommodate the type species R. thelypteridis, based solely on morphology (Pem et al. 2024). Rhagadolobiopsis is characterized by superficial, scattered, black stromata occurring on ellipsoid tar spot-like colonies, internal, branched, subhyaline hyphae developed as coralloid hyaline haustoria in the epidermal cells, multiloculate, dark brown to black ascomata opening by radiating fissures, bitunicate, non-amyloid, cylindrical-clavate to clavate asci, and biguttulate, aseptate, hyaline ascospores, with fusiform, rounded at one end and apiculate on the other end (Guatimosim et al. 2014a; Pem et al. 2024). The genus is distinct from the morphologically similar genus Rhagadolobium in having colorless, aseptate ascospores and a hymenial gel that does not turn blue with iodine. In contrast, Rhagadolobium possesses aseptate, colorless ascospores that become light brown to brown and 1-septatum when mature (Inácio and Cannon 2008). Additionally, a dichotomous key for the identification of six genera (Inocyclus, Pachypatella, Polycyclus, Polycyclina, Rhagadolobium and Rhagadolobiopsis) in Parmulariaceae associated with ferns was provided by Guatimosim et al. (2014a). Rhagadolobiopsis thelypteridis is a pathogenic fungus that causes tar spot-like symptoms on leaves of Thelypteris serrata (Thelypteridaceae) in Brazil, without any sequence data available (Guatimosim et al. 2014a). Fresh collections are expected to further investigate the ecology with host interactions, and to verified phylogenetic relationships with molecular data.
Type species: Rhagadolobiopsis thelypteridis Guatim. & R.W. Barreto, Mycologia 106(2): 277 (2014).
Other accepted species: Species Fungorum – search Rhagadolobiopsis.
Figure 1 – Rhagadolobiopsis thelypteridis. a Mature colony on host substrate. b Vertical section of a detached ascoma with several fertile locules. c Locules, showing peridium, asci and ascospores. d Asci and ascospores. Redrawn from Guatimosim et al. (2014a).
References
Inácio CA, Cannon PF 2008 – The genera of the Parmulariaceae. CBS Biodiversity Series vol 8 CBS Fungal Biodiversity Series vol. 8. Centre, Utrecht
Entry by
Jing-Yi Zhang, School of Food and Pharmaceutical Engineering, Guizhou Institute of Technology, Guiyang, 550025, People’s Republic of China, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand, School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand, Guizhou Key Laboratory of Agricultural Microbiology, Guizhou Academy of Agricultural Sciences, Guiyang, 550009, People’s Republic of China.
Published online 11 June 2025