Fungalpedia – Note 718, Dennisiella
Dennisiella. Bat. & Cif.
Citation when using this data: D. S. Marasinghe et al. 2023 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank.
Classification: Coccodiniaceae, Chaetothyriales, Chaetothyriomycetidae, Eurotiomycetes, Pezizomycotina, Ascomycota, Fungi
Epiphytic on leaves appearing as sooty molds. Subiculum well-developed, superficial, pelliculose, loose, blackish or grayish, comprising effuse, branched, subhyaline to oliva- ceous, septate hyphae, setose, reticulate. Setae erect, straight, tapering to the apex, bulbous at the base. Sexual morph: Ascomata superficial, olivaceous, brown to black, perithecial, scattered to aggregated, globose, circular when dry, uniloculate, papillate, pseudo-ostiolate, thick-walled, developed from the mycelial pellicle, ascomatal setae absent. Peridium multi-layered, externally comprising pigmented, dark brown, thick-walled cells of textura angularis, with inner layer thinner, composed of lightly brown to hyaline, thin-walled cells of textura prismatica. Hamathecium lacking paraphyses or with cylindrical, aseptate, hyaline paraphyses. Asci 8-spored, bitunicate, cylindrical to broadly clavate, short pedicellate or sessile, lacking a distinct ocular chamber. Ascospores overlapping bi-seriate or multi-seriate, irregularly arranged, fusoid, hyaline, 1–6-septate or multi-transversely septate, slightly constricted at the septum, smooth and thick-walled, lacking a gelatinous sheath or appendages. Asexual morph: Undetermined (Batista and Ciferri 1962; Tian et al. 2021).
Notes: Batista and Ciferri (1962) established Dennisiella with the type species of
D. babingtonii. It is characterized by globose, pseudo-ostiolate ascomata, developing from a setose subiculum, comprising effuse, branched, septate hyphae, erect, straight, setae with bulbous base, bitunicate, cylindrical to broadly clavate asci and fusoid, hyaline, 2–6-septate ascospores (Tian et al. 2021). Hughes (1976) regarded Microxiphium as the asexual morph of Dennisiella. Khodaparast et al. (2015) reported setaebearing conidia and these globose to subglobose, hyaline these conidia differ from mitospores of Microxiphium (Reynold and Gilbert 2005).
Type species: Dennisiella babingtonii (Berk.) Bat. & Cif., Beih. Sydowia 3: 38 (1962)
Other accepted species: Species Fungorum – search Dennisiella.
References
Batista AC, Ciferri R 1962 – The Chaetothyriales. Sydowia Beihefte 3:1–129.
Hughes SJ 1976 – Sooty moulds. Mycologia 68:693–820.
Reynolds DR, Gilbert GS 2005 – Epifoliar fungi from Queensland, Australia. Aust Syst Bot 18:265–289.
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