<abstract xmlns="http://www.w3.org/1999/xhtml">

The taxonomy and ecology of <italic>Cortinarius</italic> subgenus <italic>Myxacium</italic> section <italic>Colliniti</italic> in Fennoscandia is treated. Most species of this group have their optima in oligotrophic habitats, and play an important role in upper boreal and Arctic-alpine regions. Variation in spore morphology is subjected to numerical treatment. Relevant nomenclatural types and protologues for classical names are examined.
Presence of clamp connections is stated to be an important diagnostic character towards the most closely related section, <italic>Defibulati.</italic> Also, SEM pictures have revealed a significant difference in the spore ornamentation between the two groups. Spore shape and size provide important diagnostic characters for separation of the different taxa of section <italic>Colliniti,</italic> as shown by scattergrams. The most distinctive species in this respect are found to be C. <italic>mucosus,</italic> with characteristically narrow spores, and C. <italic>collinitus</italic> with larger spores. The species concept within the group is discussed.
Seven Fennoscandian species are recognized and their taxonomy and ecology are discussed. C. <italic>septentrionalis</italic> (type from Norway) and C. <italic>fennoscandicus</italic> (type from Finland) are described as new. Both species are common in upper (northern) boreal mountain birch <italic>(Betula)</italic> woodlands and under the low shrub <italic>Betula nana</italic> in the low alpine and arctic zones. The status of <italic>Agaricus collinitus</italic> Sow: Fries is discussed in more detail.
</abstract>

The taxonomy and ecology of Cortinarius subgenus Myxacium section Colliniti in Fennoscandia is treated. Most species of this group have their optima in oligotrophic habitats, and play an important role in upper boreal and Arctic-alpine regions. Variation in spore morphology is subjected to numerical treatment. Relevant nomenclatural types and protologues for classical names are examined.
Presence of clamp connections is stated to be an important diagnostic character towards the most closely related section, Defibulati. Also, SEM pictures have revealed a significant difference in the spore ornamentation between the two groups. Spore shape and size provide important diagnostic characters for separation of the different taxa of section Colliniti, as shown by scattergrams. The most distinctive species in this respect are found to be C. mucosus, with characteristically narrow spores, and C. collinitus with larger spores. The species concept within the group is discussed.
Seven Fennoscandian species are recognized and their taxonomy and ecology are discussed. C. septentrionalis (type from Norway) and C. fennoscandicus (type from Finland) are described as new. Both species are common in upper (northern) boreal mountain birch (Betula) woodlands and under the low shrub Betula nana in the low alpine and arctic zones. The status of Agaricus collinitus Sow: Fries is discussed in more detail.

<italic>Cortinarius</italic> subgenus <italic>Myxacium</italic> section <italic>Colliniti</italic> (Agaricales) in Fennoscandia, with special emphasis on the Arctic-alpine zones

Sommerfeltia

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 subgenus  section  (Agaricales) in Fennoscandia, with special emphasis on the Arctic-alpine zones

The taxonomy and ecology of Cortinarius subgenus Myxacium section Colliniti in Fennoscandia is treated. Most species of this group have their optima in...

Cortinarius subgenus Myxacium section Colliniti (Agaricales) in Fennoscandia, with special emphasis on the Arctic-alpine zones

Published Online: Aug 10, 2021

Page range: 1 - 43

DOI: https://doi.org/10.2478/som-1993-0005

Keywords
taxonomy, ecology, Arctic-alpine, Fennoscandia

© 1993 E. Bendiksen et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Cortinarius subgenus Myxacium section Colliniti (Agaricales) in Fennoscandia, with special emphasis on the Arctic-alpine zones

Published Online: Aug 10, 2021

Page range: 1 - 43

DOI: https://doi.org/10.2478/som-1993-0005

Keywordstaxonomy, ecology, Arctic-alpine, Fennoscandia

© 1993 E. Bendiksen et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
taxonomy, ecology, Arctic-alpine, Fennoscandia