Two new species of Leptogium (Collemataceae) with transversely septate ascospores from East Africa

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Kaasalainen, Ulla ; Kirika, Paul M. ; Mollel, Neduvoto P. ; Hemp, Andreas ; Rikkinen, Jouko:
Two new species of Leptogium (Collemataceae) with transversely septate ascospores from East Africa.
In: Folia Cryptogamica Estonica. Bd. 60 (2023) . - S. 57-64.
ISSN 1736-7786
DOI: https://doi.org/10.12697/fce.2023.60.08

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Abstract

Two epiphytic Leptogium species from East Africa, both with transversely septate ascospores, are here described as new. They produce plicate thalli and have a paraplectenchymatous proper exciple and a one cell layer thick cortex on the thalline exciple. Leptogium bellum has so far only been collected from Mt. Kilimanjaro, Tanzania, where it occurs from mid- montane forests up to the subalpine zone. Leptogium tiinae occurs in relatively open habitats at lower elevations, with the type specimen collected from the Taita Hills, Kenya. Additionally, details from a Leptogium chloromeloides isotype and a key for Leptogium species with transversely septate ascospores are provided.