Memoranda 2012

Including articles: Niclas R. Fritzén, A note on multispecies aggregative webs due to spiders (Araneae) escaping floods in Finland; Irene Routio & Matti Valta, Changes in a Land Snail community (Gastropoda) in an open cut forest area; Veikko Huhta, Ritva Penttinen & Esa Pitkänen, Cultural factors in the distribution of soil mites in Finland; Harri Harmaja, Dryopteris carthusiana var. enigmatica var. nov., a new taxon from Finland; Carl-Adam Hæggström, Hazel (Corylus avellana) pollards; Carl-Adam Hæggström, Ralf Carlsson & Eeva Hæggström, The grass genus Aira in Finland; Tea von Bonsdorff & al., New national and regional biological records for Finland 1. Contributions to agaricoid and ascomycetoid taxa of fungi; Panu Kunttu, Matti Kulju & Heikki Kotiranta, New national and regional biological records for Finland 2. Contributions to the Finnish aphyllophoroid funga (Basidiomycota); Ilona V. Blinova & Pertti Uotila, Dactylorhiza traunsteineri (Orchidaceae) in Murmansk Region (Russia); Anders Albrecht, Martti Hildén & Ritva Talman, Accessions to the Zoological Museum of the Finnish Museum of Natural History, University of Helsinki, in 2011; Mikko Piirainen & al., Accessions to the Botanical Museum of the Finnish Museum of Natural History, University of Helsinki, in 2011.