Coreomyces Thaxt.

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 38-39

Genus Coreomyces Thaxt.

MB#1243

Proceedings of the American Academy of Arts and Sciences 38: 56 ( Thaxter 1902). –

Type species: C. corixae Thaxt.

Paracoreomyces R.A.Poisson, Compte rendu hebdomadaire des Sciences de l’Académie des sciences, Paris 188: 826 ( Poisson 1929) [MB#3697]

Brief description

Monoecious. Receptacle consisting of a series of superposed cells, with a three-celled lower receptacle (cells I, II and III), some flattened cells above (known as the appendiculate cells; Fig. 4G , ac) giving rise to lateral slender branchlets including intercalary antheridia. Perithecium solitary, found on the top of the receptacle. Primary appendage vanishing with perithecium development.

Remarks

The genus consists of 20 described species, of which five in Europe, three in Denmark. The most recently described species is C. javanicus ( Lee & Na 2009) . This genus has recently been the subject of a Ph.D. dissertation (Sundberg 2018) and two papers generated from it ( Sundberg et al. 2018a, 2018b) where, with the help of molecular techniques, the reliability of some European species, like those included here, has been demonstrated. Sundberg (2018) mentioned and named two more species which have not yet been formally or validly described at the moment this work was written.

Key to the Danish species (partially following Majewski 1994b and Santamaria 2003)

1. Cells III and VI flattened to isodiametric. Thalli growing on abdominal sternites.............................. ................................................................................................................................ C. corixae Thaxt.

– Cells III and VI longer than broad.................................................................................................... 2

2. Thalli growing on inferior margin of hemielytra. Perithecium symmetric......... C. macropus Thaxt.

– Thalli growing on abdominal sternites, in middle part of 5 th segment. Perithecium asymmetric ....... .............................................................................................................................. C. arcuatus Thaxt.

Figures

Fig. 4. A–D. Euzodiomyces lathrobii Thaxt. A–B. Reduced forms. C. Typical form. D. Labelling of a secondary axis, with antheridia (an) and perithecial initial with cell VII. – E. Zodiomyces vorticellarius Thaxt.; with labelled cell I and buffer projections (bf). – F. Coreomyces arcuatus Thaxt.; mature thallus. – G. Coreomyces corixae Thaxt.; mature thallus showing the appendiculate cells (ac). – H. Coreomyces macropus Thaxt.; mature thallus. Scale bars: A–C, E–H = 50 µm; D = 25 µm. Photographs from slides ZMUC C-F-123138 (A–B), ZMUC C-F-124066 (C), ZMUC C-F-122479 (D), ZMUC C-F-122570 (E), ZMUC C-F-124285 (F), ZMUC C-F-123723 (G), and ZMUC C-F-123722 (H).