Towards a natural classification of Dothideomycetes 5: The genera Ascostratum, Chaetoscutula, Ceratocarpia, Cystocoleus, and Colensoniella (Dothideomycetes incertae sedis)

Abstract

In the Outline of Ascomycota 2009, 116 genera were listed under Dothideomycetes, genera incertae cedis. In the present study, we re-examined the generic types of Ascostratum, Chaetoscutula, Ceratocarpia, Cystocoleus and Colensoniella which are relatively poorly documented. We re-described and illustrated the type species of these genera and suggest higher level placements based on a modern classification system. Ascostratum is placed in Myriangiaceae because of similarities with Anhelia, both genera have ascostromata with numerous locules in the upper part and 4-7 transversely septate ascospores. Chaetoscutula is similar to Pododimeria in having the same host and septate, olivaceous-brown ascospores and thus is transferred to Pseudoperisporiaceae. Colensoniella has apothecioid ascomata but 1-septate oblong, uniseriately ascospores that many break in the centre form part-spores and is referred to Patellariaceae. Cystocoleus is a typical of any family of Dothideomycetes, but phylogenetic analysis showed this genus to cluster in Capnodiales incertae sedis. Ceratocarpia has glabrous ascomata, muriform ascospores and evanescent pseudoparaphyses so placed in Chaetothyriaceae. By illustrating the genera we hope to stimulate fresh collections so that these genera can be epitypified and molecular data analyzed to establish a truly natural classification.

Naming and outline of Dothideomycetes–2014 including proposals for the protection or suppression of generic names

“…Notes: Tian et al (2014) placed Ascostratum in Myriangiaceae based on the difference colour and shape of the ascospores and their completely different habits.…”

Additions to Chaetothyriaceae (Chaetothyriales): Longihyalospora gen. nov. and Ceramothyrium longivolcaniforme, a new host record from decaying leaves of Ficus ampelas

“…were collected from Dahu forest area in Chiayi, Taiwan and brought to the laboratory in plastic bags. The samples were incubated in plastic boxes at 25–30 °C for 3 days and examined following the methods described by Tian et al (2014). Morphological observations were made using an Axioskop 2 Plus compound microscope and images were taken with an Axioskop 2 Plus compound microscope equipped with a Canon Axiocam 506 Color digital camera.…”

“…The family Chaetothyriaceae was established by Hansford (1946) with the generic type Chaetothyrium Speg., and the members of this family are characterized by a loose network of dark mycelium over the substrate, ascomata produced beneath a mycelial pellicle, and forming beneath an external hyphal mat with or without setae (Batista and Ciferri 1962; von Arx and Müller 1975; Hughes 1976; Pereira et al 2009; Chomnunti et al 2012; Tian et al 2014; Zeng et al 2016). Due to some morphological similarities (i.e.…”

“…Due to some morphological similarities (i.e. bitunicate asci), Eriksson (1982) referred this family to the order Dothideales in Dothideomycetes, but subsequently, taxonomic studies have established its placement in Eurotiomycetes with support of molecular data (Chomnunti et al 2012, 2014; Tian et al 2014; Crous et al 2015; Maharachchikumbura et al 2018; Yang et al 2018). Currently, 16 genera are accepted in Chaetothyriaceae, viz.…”

Towards a natural classification of Dothideomycetes 7: The genera Allosoma, Austropleospora, Dangeardiella, Griggsia and Karschia (Dothideomycetes incertae sedis)

“…We are studying the genera placed in Dothideomycetes, genera incertae sedis , Dai et al 2014b, Li et al 2014, Tian et al 2014. These genera have generally been poorly described, often not previously illustrated and are poorly known.…”