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.