Malpighia 13: 182 ( Cavara 1899 ) Distichomyces Thaxt., Proceedings of the American Academy of Arts and Sciences 41: 308 ( Thaxter 1905 ) Laboulbeniomycetes (Fungi, Ascomycota) of Denmark Santamaria, Sergi Pedersen, Jan European Journal of Taxonomy 2021 2021-11-26 781 1 425 79XM 178471 Cavara Cavara 1899 [751,919,1492,1519] Laboulbeniomycetes Laboulbeniaceae Rickia Fungi Laboulbeniales 293 294 Ascomycota genus  MB#4752    Malpighia13: 182 ( Cavara 1899). –   Typespecies:  R. wasmanniiCavara     DistichomycesThaxt., Proceedings of the American Academy of Arts and Sciences41: 308 ( Thaxter 1905)[MB#1673]    Brief description Monoecious. Receptacle laminate, flattened, multiseriate, consisting of three vertical rows of cells known as anterior (ventral), posterior (dorsal) and median (axial) series. Sometimes the median series is missing. Anterior and posterior series bear secondary one-celled appendages and flask-shaped antheridia. In most species, the perithecium seems to be borne from the anterior series. Perithecium with four cells in each vertical row of outer wall cells.    Remarks   Rickiais one of the largest genera in Laboulbenialesconsisting of 156 species, of which 16 inEurope, five in Denmark. The most recently described species is  R. cifoneae( Rossi & Bernardi 2018). For more details on the morphology of the genus  Rickiasee Santamaria et al.(2016).   Key to the Danish species (partially following Majewski 1994band Santamaria et al.2016)     1. Anterior series consisting of 2–5 cells.............................................................................................. 2  – Anterior series consisting of more than 16 cells. On  ScaphisomaLeach, 1815(Col. Staphylinidae Scaphidiinae) .................................................................................................  R. peyerimhoffiiMaire   2. Anterior series consisting of two cells. Uppermost cell of posterior series (p 6) forming a conspicuous free pedicel that serves of base for the primary appendage. On  CylindroiulusVerhoeff, 1894( Diplopoda Julidae)..................................................................................................  R. laboulbenioidesDe Kesel  – Anterior series consisting of 3–5 cells. Other characters not as above ............................................ 3   3. Antheridia numerous. Thallus more than 190 µm long. On  UncigerBrandt, 1841( Diplopoda Julidae). ...........................................................................................................  R. uncigeriScheloske  – One to a few antheridia. Thallus less than 190 µm long. On Col. Staphylinidae............................. 4   4. Perithecium with a narrow and fairly long neck. Antheridia on both, anterior and posterior series. On  ProteinusLatreille, 1796(Col. Staphylinidae)..............................................  R. proteiniT.Majewski  – Perithecial neck not as above. One or two antheridia on the anterior series. On  OmaliumGravenhorst, 1802(Col. Staphylinidae)..................................................................................  R. huggertiiBalazuc