Acompsomyces stenichni (Scheloske) I.I.Tav.

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 214

Acompsomyces stenichni (Scheloske) I.I.Tav.

MB#105014

Fig. 46A–C

Mycologia Memoirs 9: 131 ( Tavares 1985). – Basionym: Stigmatomyces stenichni Scheloske, Parasitologische Schriftenreihe 19: 149 ( Scheloske 1969) [MB#339712]. – Type: “ Auf den Elytren von Stenichnus scutellaris (Col., Scydmaenidae ), den ich in Bruchwäldern bei Schwand/Nürnberg erbeutete. Deutschland. Holotypus Abb. 50”. [ Germany]

Diagnostic features

Appendage consisting of around seven superposed cells, each of them bearing a solitary lateral, flaskshaped antheridium, except for the uppermost which bears a pair of antheridia. [Detailed descriptions: Weir 1994; Majewski 1994b]

Distribution and hosts

Associated with species of the genus Stenichnus Thomson, 1859 (Col. Staphylinidae Scydmaeninae ) from Germany (type), Poland ( Majewski 1973c), United Kingdom ( Weir 1994), and France ( Santamaria & Rossi 1999). The record from Mexico on an undetermined scydmaenid ( Benjamin 1989) requires verification.

Collections examined from Denmark

On Stenichnus collaris (Müller & Kunze, 1822) (Col. Staphylinidae Scydmaeninae ) DENMARK – Lolland, Falster, Møn (LFM) • Krenkerup ; 54°46.408′ N, 11°39.955′ E; PF77; 26 Jun. 1901; F. de Tengnagel DrY0168; F. de Tengnagel det.; ZMUC C-F-124234 • Naesby Strand ; 54°44.625′ N, 11°4.539′ E; PF36; 23 Feb. 2014; JP 553; JP det.; ZMUC C-F-123039 .

Remarks

First record from Denmark. The generic assignment of this species is questionable. Formerly described in the genus Stigmatomyces, Tavares (1985) suggested its transfer to the genus Acompsomyces , but Benjamin (1989) questioned this statement. The arrangement of cells in the receptacle as well as the trichogyne morphology agree with most typical species of Acompsomyces on Cryptophagidae and Lathridiidae , but characters of the appendage and perithecial apex argue with this advice. Study of more material of this apparently rare species may lead to the creation of a new genus.

Figures

Fig. 46. A–C. Acompsomyces stenichni (Scheloske) I.I.Tav. A, C. Submature thalli. B. Immature thallus showing the trichogyne (tr) and cells of receptacle (I, II, III). – D–E. Aphanandromyces audisioi W.Rossi. Mature thalli. D. With labelled cells of receptacle (I, II, III). E. With labelled primary appendage (pa), and antheridia (an). – F–H. Bordea denotata Haelew. & De Kesel. Mature thalli. Different parts of the thallus are labelled. Abbreviations: a = primary septum; an = antheridium; sx = spinous process or remains of the original spore apex; I, II, III = cells of primary receptacle. Arrows = cytoplasmatic constraint or septum-like marking above septum II–VI. Scale bars: 50 µm. Photographs from slides ZMUC C-F-123039 (A–C), ZMUC C-F-122509 (D), ZMUC C-F-122633 (E), ZMUC C-F-122556 (F–H).