Aderkomyces was introduced in 1961 by the Brazilian mycologist
Augusto Chaves Batista for a foliicolous lichen with fan-shaped (flabelliform) ,
Aderkomyces couepiae. That species was later transferred to
Tricharia as
T. couepiae. In their family-wide revision of the family
Gomphillaceae,
Robert Lücking,
Emmanuël Sérusiaux and
Antonín Vězda resurrected
Aderkomyces to accommodate a set of species previously placed in
Tricharia (in the loose sense) that share white , often (flattened)
apothecia with a hyphal , and at least partly flabellate hyphophores. They treated a "core group" centred on the type
A. couepiae and including
Tricharia heterella (with
Psathyromyces rosacearum as its
synonym), whose members characteristically have a smooth thallus, large applanate apothecia and flabelliform hyphophores. The same work outlined additional groupings now placed in
Aderkomyces: one centred on
T. cubana and
T. guatemalensis with small, sessile, dark apothecia and an almost excipulum; a second around
T. albostrigosa, with sessile, pale apothecia and a hyphal excipulum; and a residual set centred on
T. cretacea whose relationships remain unclear owing to poorly known hyphophores and/or diahyphae. Overall,
Aderkomyces is distinguished within the
Echinoplaca–
Tricharia grade by its white setae, non-crystalline thallus and hyphal excipulum, whereas superficially similar
Arthotheliopsis differs by having
Echinoplaca-like adnate apothecia and slightly differentiated diahyphae. As part of regularising the genus concept, Lücking and colleagues made numerous
new combinations in
Aderkomyces for species formerly placed in
Tricharia (and, in one case, under other names), including
A. albostrigosus,
A. armatus,
A. carneoalbus,
A. cretaceus,
A. cubanus,
A. deslooveri,
A. dilatatus,
A. fumosus,
A. heterellus and
A. guatemalensis, among others. These changes reflect the shared suite (white setae; hyphal excipulum; flabellate or related hyphophore types) that separates
Aderkomyces from both
Tricharia s.str. and allied genera within Gomphillaceae. A 2024
morphology-based 'phylogenetic binning' analysis—assigning species to likely evolutionary groups from their traits—showed that
Aderkomyces is
polyphyletic, with its species split among multiple lineages. The type species,
A. couepiae, binned with
Arthotheliopsis (100% support), whereas a separate
clade containing sequenced
A. papilliferus and
A. dilatatus represents
Aderkomyces in the strict sense (
sensu stricto). The authors note that, if future sequencing confirms the type placement,
Aderkomyces would apply to the
Arthotheliopsis-like clade and the "papilliferus clade" would require a different generic name. The same analysis reassigns several species previously placed in
Aderkomyces to other genera now recognised in the family: e.g.,
A. heterellus,
A. planus and
A. pruinosus with
Psathyromyces;
A. albostrigosus,
A. deslooveri,
A. microcarpus,
A. guatemalensis and
A. verrucosus with
Spinomyces;
A. carneoalbus,
A. purulhensis and (provisionally)
A. lobulicarpus with
Roselviria;
A. microtrichus in the
Calenia–
Echinoplaca grade;
A. verruciferus with mixed signal (often with
Verruciplaca); and several names (e.g.
A. cretaceus,
A. cubanus,
A. fumosus,
A. ramiferus,
A. subplanus) remaining unresolved. Many of these transfers were formalised alongside the description of new genera in a companion work. ==Species==