Discovery of the first lichenized fungus in the family Chaetothyriaceae ( Ascomycota ), Ceramothyrium ryukyuense sp. nov.
Ceramothyrium ryukyuense ( Chaetothyriaceae ) is described as a new species from Okinawa, southern Japan. It is characterized by subglobose minute ascomata (up to 110 μm diam.) covered with a brown mycelial pellicle, small ellipsoid 1(–2)-septate ascospores (8.7–13.8 × 3.4–4.9 μm) within a small as...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
W. Szafer Institute of Botany, Polish Academy of Sciences
2024-12-01
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| Series: | Plant and Fungal Systematics |
| Subjects: | |
| Online Access: | https://pfsyst.botany.pl/Discovery-of-the-first-lichenized-fungus-in-the-family-n-Chaetothyriaceae-Ascomycota,195469,0,2.html |
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| Summary: | Ceramothyrium ryukyuense ( Chaetothyriaceae ) is described as a new species from
Okinawa, southern Japan. It is characterized by subglobose minute ascomata (up to 110 μm
diam.) covered with a brown mycelial pellicle, small ellipsoid 1(–2)-septate ascospores
(8.7–13.8 × 3.4–4.9 μm) within a small ascus (20–30 × 13–17 μm), and a lichenized thallus.
This species resembles non-lichenized Brazilian species, C. paiveae and C. philodendri , in
producing minute ascomata and 1–4 or 7 septate ascospores. However, besides its lichenized
status, C. ryukyuense is distinguished by its smaller asci (up to 30 μm long in C. ryukyuense
vs. 30–42 μm long in C. paiveae , and 50–100 μm long in C. philodendri ), and predominantly
1-septate ascospores in C. ryukyuense , whereas multi-septate in C. paiveae and
C. philodendri . It was collected on a living leaf of Arecaceae in the subtropical forest near
the seashore. In a phylogenetic tree based on nuITS and nuLSU sequences, C. ryukyuense
formed a sister clade to Ceramothyrium exiguum which is known as an anamorphic species.
DNA sequences of C. paiveae and C. philodendri , morphologically similar species
to C. ryukyuense , were not available in this study. Algal cells distant from the perithecium
exhibited continuous branching, while those near the perithecium were strongly deformed
into a spherical shape and were partially unicellular. The photobiont of C. ryukyuense is
suggested to be a species of Trentepohliales , inferred from a phylogenetic analysis based
on the rbcl sequence. Ceramothyrium ryukyuense is the first report of a lichenized lineage
within Chaetothyriaceae . |
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| ISSN: | 2544-7459 2657-5000 |