A revision of Leptogium (Collemataceae, lichenized Ascomycota) from Antarctica with a key to species

With more than 180 known species, Leptogium has its greatest richness in tropical regions. Only three species have so far been reported from Antarctica but extensive surveys in the Antarctic Maritime Islands have shown that this is an underestimate. Leptogium antarcticum (non-isidiate, with medulla...

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Bibliographic Details
Published in:The Lichenologist (London) 2018-07, Vol.50 (4), p.467-485
Main Authors: KITAURA, Marcos J., SCUR, Mayara C., SPIELMANN, Adriano A., LORENZ-LEMKE, Aline P.
Format: Article
Language:English
Subjects:
Hyphae
Identification keys
Islands
Leptogium
Linum puberulum
Lithopoma tectum
Morphology
New species
Physical characteristics
Regions
Surveys
Tectum
Tropical climate
Tropical environment
Tropical environments
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Summary:With more than 180 known species, Leptogium has its greatest richness in tropical regions. Only three species have so far been reported from Antarctica but extensive surveys in the Antarctic Maritime Islands have shown that this is an underestimate. Leptogium antarcticum (non-isidiate, with medulla composed of columnar hyphae), L. marcellii (non-isidiate, with medulla composed of a sponge-like arrangement of hyphae) and L. tectum (isidiate, with medulla composed of columnar hyphae) are described here as new to science. The new species are compared with those already reported for the genus in Antarctica, namely L. crispatellum, L. menziesii and L. puberulum, and an identification key is provided. Sequences of ITS and mrSSU regions were obtained from recently collected L. antarcticum, L. marcellii, L. puberulum and L. tectum specimens. Morphological and anatomical data were compared along with available genetic data in order to delimit these species more accurately, using an integrative approach.
ISSN:0024-2829
1096-1135
DOI:10.1017/S0024282918000269