Fungalpedia – Note 814, Crassochaeta
Crassochaeta Réblová
Citation when using this data: Huang SK et al. 2021 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig. 1
Classification: Chaetosphaerellaceae, Coronophorales, Hypocreomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi
Saprobic on decayed wood. Sexual morph: Subiculum lacking or extensive, composed of densely clustered, dark brown to black, septate, rigid, branched, spinulose hyphae with tapering ends. Ascomata perithecial, superficial, gregarious, dark brown to black, turbinate, conical to ovoidal, tuberculate, collapsing or laterally collapsing when dry, surrounded with dark brown spinous setae, ostiolate with papilla, periphysate. Peridium membranaceous, composed of brown to hyaline cells of textura angularis to textura prismatica, Munk pore absent or present. Paraphyses cylindrical, branched, septate, sometimes constricted at the septa, evanescent. Asci 8-spored, unitunicate, cylindrical, with short pedicel, evanescent. Ascospores fusiform to ellipsoidal, smooth-walled, slightly curved, aseptate, hyaline when young, becoming 3-septate, slightly constricted at the septa, two middle cells brown to dark brown and two end cells hyaline, mostly with guttules. Asexual morph (associated): Conidia solitary, scattered among the hyphae of the subiculum or attached to the surface of the ascomata, ellipsoidal to citriform, slightly apiculate, brown to black, aseptate, with a longitudinal germ slit that nearly connects the two ends (adapted from Réblová 1999b).
Notes – Réblová (1999b) established Crassochaeta in Trichosphaeriaceae and segregated two Chaetosphaeria species as its members, Crassochaeta fusispora and Cra. nigrita (type), based on their ascomata being larger than Chaetosphaeria. Subsequently, Huhndorf et al. (2004b) analyzed LSU sequence data of Cra. nigrita and found that Crassochaeta is sister to Chaetosphaerella in Coronophorales. Morphologically, Chaetosphaerella and Crassochaeta have similar setose ascomata, cylindrical asci and versicoloured ascospores, but are associated with different asexual morphs. Chaetosphaerella has septate, ellipsoidal conidia, while Crassochaeta has citriform, aseptate conidia with a longitudinal germ slit (Réblová 1999a, b). Thus, Crassochaeta is accommodated in Chaetosphaerellaceae based on morphology and phylogenetic results (Maharachchikumbura et al. 2015, 2016, Hyde et al. 2020e, Wijayawardene et al. 2020). In this study, Crassochaeta is sister to Chaetosphaerella (100%ML/1.00BY).
Type species: Crassochaeta nigrita (Sacc.) Réblová, Mycotaxon 71: 48 (1999).
Other accepted species: Species Fungorum – search Crassochaeta.
Figure 1 – Crassochaeta nigrita: a–c, h, k–m (IMI-K(M):37405, isotype); d–g, i–j, n–o (CUP-CUP-CH 661, paratype). a Material. b Gregarious ascomata. c–d Ascomata on the host. e Peridium with Munk pores. f Periphyses. g Setae. h Hyphae. i–k Asci (j apical ring in empty ascus). l–o Ascospores. Scale bars: b = 1 mm, c = 500 µm, d = 200 µm, i = 100 µm, f–h, k = 50 µm, e = 20 µm, l–o = 10 µm.
References
Entry by
Shi-Ke Huang, State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang 550025, China, The Engineering Research Center of Southwest Bio-Pharmaceutical Resources, Ministry of Education, Guizhou University, Guiyang 550025, Guizhou Province, 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, The Mushroom Research Centre, Guizhou University, Guiyang 550025, China
Published online 14 September 2021