Inocybe baltica and I. suecica, two new smoothspored species from the Baltic Sea region

Abstract

Two new species, with pruinose stipe and smooth spores, are described from Fennoscandia and Estonia. Inocybe baltica is a rather large species, associated with Pinus sylvestris on calcareous sandy soils, often occurring at seashores. I. suecica is a smaller species associated with deciduous trees on more rich and calcareous soils, often found in parks and cemeteries. Both species are so far known to occur only in the hemiboreal zone.

Three new smooth-spored species of Inocybe, two new epitypes, and updates on earlier epitypifications

“…Sequences were blasted against GenBank ( Johnson et al 2008) and in Geneious R10 (Biomatters) against the “Full “UNITE+INSD” dataset” ( Abarenkov et al 2022), in order to find additional records for the species treated here and putative close relatives. The majority of the close relatives were found among taxa treated in earlier publications ( Bandini et al 2021c, 2022a, 2022b; Vauras & Larsson 2016), so that for each species, the inclusion of a single full-length sequence (ITS + LSU approx. 1400 bp) or the type sequence plus one full length sequence, if available, was considered sufficient.…”

“…Inocybe suecica Vauras & E. Larss., another species with small spores, can be distinguished from I. albomarginata , e.g., by the presence of a velipellis, smoother pileus surface and glabrous centre of pileus, as well as larger spores ( Vauras & Larsson 2016; DB, personal observation), and I. pseudoreducta , e.g., by the presence of a velipellis, smoother centre of pileus, and wider spores often shaped like apple seeds ( Stangl & Glowinski 1981; La Rosa et al 2017). Inocybe bonii (see below) differs from I. albomarginata , e.g., by the greyish velipellis, smoother pileus surface at the centre, not flat lamellae and larger spores.…”

“…Inocybe bonii has, e.g., on average shorter but wider spores, on average smaller hymenial cystidia and longer, mostly narrow utriform or subcylindrical caulocystidia with mostly a long and undate neck. The spores and hymenial cystidia of I. suecica are on average wider, and the species grows with frondose trees ( Vauras & Larsson 2016; DB, personal observation). Inocybe brijunica Mešić, Tkalčec & Haelew.…”

“…Inocybe glabripes Ricken differs from I. bonii by usually lacking reddish tinges in the pileus colour, at most a finely rimose pileus surface, stipe pruinose only near the apex, smaller spores and shorter hymenial cystidia (see, e.g., Ricken 1910–1915; Lange 1917, as “ I. microspora ”; Kuyper 1986; Stangl 1989; Bandini et al 2021c), I. minimispora , e.g., by the only faint reddish hue in the pileus colour, fugacious whitish velipellis, stipe pruinose only near the apex, smaller spores and shorter caulocystidia ( Reumaux 1986; Bandini et al 2021c), and I. heterosemen , e.g., by the at the centre reddish and towards the margin yellow-ochraceous pileus colour, on average smaller spores and shorter, often (sub)clavate hymenial cystidia ( Carteret & Reumaux 2012; Bandini et al 2022b). Inocybe pseudoreducta has on average shorter, mostly ovoid or apple-seed shaped spores and plumper, on average wider hymenial cystidia and mostly (sub)fusiform, often somewhat deformed caulocystidia not with an undate neck, whereas I. suecica never has an almost reddish pileus colour, pileus often much darker at the centre than towards the margin, stipe not becoming intensely reddish-brownish with age but paler, and hymenial cystidia often with a clearly demarcated transition from the bulge to the neck, and usually growing on more rich and less dry terrain ( Vauras & Larsson 2016; DB, personal observation). The pileus of I. virgatula Kühner has at most a faint reddish hue, the stipe is pruinose only near the apex, has larger spores with a suprahilar depression and on average larger hymenial cystidia ( Kühner 1955; Stangl 1974; Bandini et al 2021c).…”