Fungalpedia – Note 898, Pseudoproboscisporaceae
Pseudoproboscisporaceae. H. Zhang, K.D. Hyde & Maharachch.
Citation when using this data: Dong W et al. 2021 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank
Classification:Atractosporales, Diaporthomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi
Pseudoproboscisporaceae was established to accommodate two annulatascaceae-like genera, Diluviicola and Pseudoproboscispora (Zhang et al. 2017). Pseudoproboscisporaceae differs from other families by ascomata often lying horizontally on the host substrate, with a lateral neck, and fusiform ascospores with bipolar filamentous appendages, which are initially coiled then unfurl to form long threads (Zhang et al. 2017). Pseudoproboscisporaceae was accommodated in Atractosporales based on phylogenetic analysis, morphology and its occurrence in freshwater habitat (Zhang et al. 2017). However, this family was shown to phylogenetically not belong to Atractosporales, and clustered with Junewangiaceae in Luo et al. (2019) and Cancellidium in Hyde et al. (2020). In this study, Pseudoproboscisporaceae forms a sister clade with Junewangiaceae with weak bootstrap support, which concurs with phylogenies reported by Luo et al. (2019). Since Pseudoproboscisporaceae did not cluster consistently with any families in Diaporthomycetidae, we refer it to Diaporthomycetidae families incertae sedis.
Strain HKUCC 3710 bearing the name “Cateractispora recepticuli” clusters in Pseudoproboscisporaceae and it was presumed to be a synonym of Pseudoproboscispora aquatica based on the comparison of photo plate of C. recepticuli and P. aquatica (Cai et al. 2006, Zhang et al. 2017). However, HKUCC 3710 (holotype HKU(M) 5239) has been formally published as Cataractispora receptaculorum in Ho et al. (2004). The ascospore appendages of C. receptaculorum are initially in the form of mucilaginous pads and then unfurl readily in water to form long threads and do not coil as a proboscis (Ho et al. 2004). Whereas, appendages of P. aquatica are at first coiled, proboscis-like at each end and then uncoil in water to form long threads (Wong & Hyde 1999a). In our phlogenetic tree, C. receptaculorum clusters with P. thailandensis but they have over 70 nucleotide difference in LSU sequence data which also support them to be different genera. Considering the morphological similarity of annulatascaceae-like taxa and the lack of sequence data from the type species C. aquatica, we retain Cataractispora in Annulatascaceae as suggested by Hyde et al. (2020).
Zhang et al. (2017) introduced Pseudoproboscispora thailandensis in Pseudoproboscisporaceae, however, another species P. caudae-suis clusters in Annulatascaceae (Fig. 1). Pseudoproboscispora caudae-suis was transferred from Ceriospora based on its morphological similarity to P. aquatica (type) (Campbell et al. 2003). However, species in Pseudoproboscispora, such as P. aquatica and P. thailandensis, as well as their relatives Cataractispora, Diluviicola and Neodiluviicola, have filamentous appendages, which initially coiled or proboscis-like or cap-like then unfurl to form long threads. Whereas, P. caudae-suis has tail-like appendages that straight and persistent near base and coiled towards the apex (holotype IMI 38506) (Ingold 1951). In addition, the asci of P. caudae-suis have an apical pore, which is never seen in Pseudoproboscispora, even in Pseudoproboscisporaceae (Ingold 1951, Zhang et al. 2017, this study). Phylogenetically, two strains A40-1A and A336-2D which are both under the name P. caudae-suis (Campbell et al. 2003) cluster in Annulatascaceae rather than in Pseudoproboscisporaceae. Also, at least one strain was probably misidentified as they have more than 100 nucleotide differences in LSU sequence data. Although P. caudae-suis morphologically does not belong in Pseudoproboscispora, we do not exclude it from Pseudoproboscispora until sequence data from epitype of P. caudae-suis and P. aquatica are obtained.
In this study, we provide a new collection of Diluviicola capensis, the type species of Diluviicola, with DNA sequence data which is phylogenetically distanct from D. aquatica. Thus, D. aquatica is transferred to a new genus Neodiluviicola based on morphology and phylogeny.
Type genus: Pseudoproboscispora Punith.
Other accepted species: Species Fungorum – search Pseudoproboscispora.
References
Cai L, Hyde KD, Tsui CKM. 2006 – Genera of freshwater fungi. Fungal Diversity Press, Hong Kong
Entry by
Wei Dong, Faculty of Agriculture and Food, Kunming University of Science & Technology, Kunming 650500, China, Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand, Innovative Agriculture Research Center, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand, Center of Excellence for Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, Innovative Institute for Plant Health, Zhongkai University of Agriculture and Engineering, Haizhu District, Guangzhou 510225, China
Published online 15 February 2021