Acompsomyces Thaxt.

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 213

Genus Acompsomyces Thaxt.

MB#45

Proceedings of the American Academy of Arts and Sciences 37: 37 ( Thaxter 1901b). –

Type species: A. corticariae Thaxt.

Brief description

Monoecious. Receptacle three-celled. Cells II and III separated by an oblique or vertical septum, adnate on top of the cell I ( Fig. 46B ). Primary appendage free, its cells giving rise to three or 7–8 antheridia showing free efferent necks; the terminal antheridium bears a dorsal spinous process (the original spore apex, sx). Perithecium with 5(–6) cells in each vertical row of outer wall cells; the perithecial tip showing four terminal lobes surrounding a well-defined conical apex. Trichogyne three-celled, consisting of a basal cell bearing two divergent, papillate cells ( Fig. 46B , tr).

Remarks

The genus consists of eight species, of which six in Europe, one in Denmark. The most recently described species is A. ootypi ( Santamaria 1993c) . Six of the eight species occur on Col. Cryptophagidae and Lathridiidae , forming a consistent group with distinctive characteristics ( Benjamin 1989; Santamaria 2003). The other two species, A. decarthricola Speg. on Pselaphinae (Col. Staphylinidae ) from Argentina ( Benjamin 2001) and A. stenichni (Scheloske) I.I.Tav. on Scydmaeninae (Col. Staphylinidae ) need further revision for a certain generic allocation.

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).