Myrmecridium Arzanlou et al.
Index Fungorum number: IF 504559
Sexual morph: Ascomata solitary or aggregated in small groups, immersed, hyaline to pale brown. Papilla or short necks centrally located, opening flush with the wood surface or slightly projecting. Ostiole periphysate. Clypeus positioned slightly beneath the wood surface. Ascomatal wall two layered. Paraphyses hyaline, septate, slightly constricted at the septa, cylindrical. Asci cylindrical, with a slender, long stipe. Ascospores ellipsoidal, delicately verruculose, septate, hyaline. Asexual morph: Colonies flat, with immersed mycelium. Conidiophores arising vertically and clearly distinct from creeping hyphae, unbranched, straight or flexuose, septate, thick-walled. Conidiogenous cells polyblastic, integrated, terminally, cylindrical. Conidia solitary, subhyaline, smooth or finely verrucose, obovoidal or fusiform, conidial secession schizolytic.
Notes: The genus Myrmecridium was introduced by Arzanlou et al. (2007) to accommodate Ramichloridium-like taxa with hyaline mycelium, and pale to unpigmented conidiophores with pimple-like conidiogenous denticles at their apices. Twelve species are accepted in this genus (Peintner et al. 2016; Réblová et al. 2016b; Tibpromma et al. 2017) and two of them were collected from freshwater habitats (Réblová et al. 2016b; Tibpromma et al. 2017)
Type species: Myrmecridium aquaticum. Z.L. Luo, K.D. Hyde & H.Y. Su, in Luo et al., Fungal Diversity: 10.1007/s13225-019-00438-1,  (2019)
Myrmecridium aquaticum Luo et al.
Myrmecridium fluviae Hyang B. Lee & T.T.T. Nguyen
Myrmecridium montsegurinum Réblová & J. Fourn
Arzanlou A, Groenewald JZ, Gams W, Braun U et al. (2007) Phylogenetic and morphotaxonomic revision of Ramichloridium and allied genera. Stud Mycol 58:57–93
Peintner U, Knapp M, Fleischer V, Walch G et al. (2016) Myrmecridium hiemale sp nov from snow-covered alpine soil is the first eurypsychrophile in this genus of anamorphic fungi. Int J Syst Evol Microbiol 66:2592–2598
Reblova M, Fournier J, Stepanek V (2016b) Two new lineages of aquatic ascomycetes: Atractospora gen. nov. and Rubellisphaeria gen. et sp. nov., and a sexual morph of Myrmecridium montsegurinum sp. nov. Mycol Prog 15:21.
Tibpromma S, Hyde KD, Jeewon R, Maharachchikumbura SSN et al. (2017) Fungal diversity notes 491–602: taxonomic and phylogenetic contributions to fungal taxa. Fungal Divers 83:1–261