ORIGINAL ARTICLE
Discovery of the first lichenized fungus in the family
Chaetothyriaceae (Ascomycota), Ceramothyrium ryukyuense
sp. nov.
1
Degree Programs in Life and Earth Sciences, Graduate School of Science
and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba,
Ibaraki, 305-8577, Japan
2
Department of Botany, National Museum of Nature and Science, 4-1-1
Amakubo, Tsukuba, 305-0005, Japan
3
School of Integrative and Global Majors, University of Tsukuba, 1-1-1
Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
Online publication date: 2024-12-13
Publication date: 2024-12-13
Plant and Fungal Systematics 2024; 69(2): 167-176
KEYWORDS
ABSTRACT
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.
FUNDING
This study
was partly supported by JSPS KAKENHI 22KJ0430 for the
first author.
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