Fungalpedia – Note 698, Rhagadolobium

 

RhagadolobiumHenn. & Lindau.

Citation when using this data: D. S. Marasinghe et al. 2023 (in prep.) – Fungalpedia, Ascomycota.

Index Fungorum, Facesoffungi, MycoBank, GenBank., Fig 1

Classification: Parmulariaceae, Asterinales, Dothideomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi 

Colonies epiphyllous on leaves. Sexual morph: Ascomata solitary to gregarious, superficial, dark brown to black, membranous, hyphae at margins. Upper wall comprising of radially arranged dark brown cells to the center. Hamathecium with filamentous, septate, often with a swollen apical cell. Asci bitunicate, hyaline, clavate or cylindrical, 8-spored. obliquely uniseriate or biseriate with short pedicel. Ascospores 1-septum, hyaline or lightly pigmented, oblong to slightly fusiform, constricted at the septum, granulated wall. Asexual morph: Undetermined.

Note: Hennings and Lindau (1897) established Rhagadolobium with the type species of Rhagadolobium hemiteliae. Rhagadolobium is characterized by superficial, circular or elliptical, flattened, black ascomata with upper wall of stromata comprising a thin dark brown tissue (Hongsana et al. 2020a). Rhagadolobium differs from Rhagadolobiopsis in producing aseptate, hyaline, 1-septum ascospores becoming light brown to brown with a hymenial gel stained in iodine (Inacio and Cannon 2008).

Type species Rhagadolobium hemiteliae P. Henn. & Lind. [as ‘hemiteliae’], Bot. Jb. 23: 287 (1897)

Other accepted species:  species Fungorum – search Rhagadolobium.

 

image

Figure 1 – Rhagadolobiopsis thelypteridis. a Ascomata. b Vertical section through ascomata. b Asci. c Ascospores. Scale bars: a–c = 20 µm. Redrawn from Guatimosim et al. (2014b)

 

References

Hennings PC, Lindau 1897 – Botanische Jahrbücher fur Systematik 23:287.

Hongsanan S, Hyde KD, Phookamsak R et al 2020a – Refined families of Dothideomycetes: orders and families incertae sedis in Dothideomycetes. Fungal Divers 105:17–318.

Inácio CA, Cannon PF 2008 – The genera of the Parmulariaceae. CBS biodiversity series, vol 8. CBS Fungal Biodiversity Centre, Utrecht.

 

Entry by 

Diana Sandamali Marasinghe, 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, Mushroom Research Foundation, 128 M.3 Ban Pa Deng T. Pa Pae, A. Mae Taeng, Chiang Mai, 50150, Thailand

 

Published online 29 August 2023

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