Flammulina spp. in Europe
In Europe, there are 8 (9 if you count Laccariopsis mediterranea, formerly F. mediterranea) well established Flammulina species: F. elastica, F. velutipes, F. populicola, F. rossica, F. fennae, F. finlandica, F. ononides and F. cephalariae. (It may also be possible, though very unlikely, that F. filiformis may have escaped cultivation in some places and is found wild locally.) With exception of the host specific and very rare F. ononides on Ononis spinosa, F. cephalariae on Cephalaria leucantha and Laccariopsis mediterranea on Ammophila litoralis, microscopy is always needed to differentiate between those species. Especially important are spore sizes and Q (ratio of spore length to width). In most cases, the pileipellis should be observed, too.
If you have valuable information to add, please do so in the comment section. Just because I'm writing this journal entry doesn't mean I'm the leading expert on those fungi.
Primary literature:
- 2023: https://ukrbotj.co.ua/archive/80/5/431
- 2018 (most important one): https://link.springer.com/article/10.1007/s11557-018-1409-2
- 2016 (German): https://www.zobodat.at/pdf/Mycologia-Bavarica_17_0007-0024.pdf
- 2015: https://www.researchgate.net/publication/279460396_Flammulina_fennae_new_to_Britain
- 2010: https://www.researchgate.net/publication/49249474_The_delimitation_of_Flammulina_Fennae
- 2008: https://www.researchgate.net/publication/228688638_New_collections_of_Flammulina_rossica
- 2008: https://www.researchgate.net/publication/253985153_Flammulina_ononidis_-_a_new_species_for_Slovakia
- 2007 (Spanish): https://www.raco.cat/index.php/Micologia/article/view/272565/360754
- 1999: https://www.researchgate.net/publication/283157171_New_species_varieties_and_combinations_in_the_genus_Flammulina
- 1983: https://repository.naturalis.nl/pub/531983/PERS1983012001005.pdf
Secondary literature:
Dutch:
English:
- Differentiation table (see "Other Flammulina species"): https://www.fungusfactfriday.com/071-flammulina-velutipes/
- Description (incl. collection data for Britain): https://www.first-nature.com/fungi/flammulina-elastica.php
- World key (a bit outdated): https://web.archive.org/web/20160303165949/http://www.bio.utk.edu/mycology/Flammulina/default.html
Finnish:
- Description: https://foorumi.laji.fi/t/talvijuurekkaista/17327
French:
- Description: https://www.mycodb.fr/fiche.php?genre=Flammulina&espece=velutipes&source=search
- Description: https://champis.net/description/22297
German:
- Differentiation key (see second comment): https://forum.pilze-bayern.de/index.php?topic=1675.0
- Description: https://www.pilzforum.eu/board/thread/26959-flammulina-velutipes-gemeiner-samtfu%C3%9Fr%C3%BCbling/
- Description: https://www.myk.univie.ac.at/wp-content/uploads/2016/11/Flammulina.pdf
Italian: