New Species of Harpellales and Amoebidiales from the N-E Iberian Peninsula, and thallial plasmogamy in a Paramoebidium species

New data about trichomycetes from the North-eastern Iberian Peninsula is reported, including the description of two new species of Amoebidiales and one species of Harpellales: Paramoebidum contortum from Baetidae and Ephemerellidae (Ephemeroptera, mayflies) nymphs, Paramoebidium lateralis from Capniidae and Leuctridae nymphs, and Ejectosporus chimaera from Capniidae nymphs (Plecoptera, stoneflies). Both species of Paramoebidium are characterized by their particular thallial and holdfast structures. We report the occurrence of a thallus that originated from the fusion of what seems to be two cystospores in a specimen of P lateralis. This could be an important addition in the study of Amoebidiales, since thallial fusion processes were previously unknown for this order. The new species of Harpellales, Ejectosporus chimaera, is a rare dimorphic species with a narrow distribution, which shares similarities with the genera Genistelloides and Lancisporomyces. New geographic records for the Iberian Peninsula are also provided, including Paramoebidium coipulentum, P. hamatum (Amoebidiales), Glotzia centroptili, Smittium lentaquaticum, and Sm. mucronatum (Harpellales). Comments are provided for each of the species, together with photographs, to illustrate each taxon.