Neobelonopsis acutata
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Itagaki2023MycoKeys99, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Itagaki2023MycoKeys99">{{Citation See also the citation download page at the journal. |
Ordo: Helotiales
Familia: Mollisiaceae
Genus: Neobelonopsis
Name
Neobelonopsis acutata Itagaki & Hosoya sp. nov. – Wikispecies link – Pensoft Profile
Etymology
Named after the acute apices of ascospores.
Diagnosis
Characterized by 3-septate ascospore with acute extremes and conidiophores densely aggregated in clusters. The present species resembles N. multiguttata. See Diagnosis in N. multiguttata for diagnostic characters.
Holotype
TNS-F-86648, Yugashima, Izu City, Shizuoka Pref. Japan, 15 October 2021, on decaying culm of Miscanthus sinensis; ex-holotype culture NBRC 115570.
Description
Apothecia arising from scuta. Scuta superficial, scattered to gregarious, flat discoid, blackish brown (C80M100Y80–100K60), 0.1–0.3 mm diam., textura epidermoidea, composed of closely packed thick-walled cells. Apothecia 0.1–0.2 mm high, seated on subiculum, with grayish brown (C0–30M30Y40K60) to black receptacle; disc 0.25–1.4 mm diam., white to pale gray (K10) when fresh, shrunk to 0.2–1 mm diam., turns pale yellow (Y10) when dried. Ectal excipulum 25–40 µm thick at base, 15–20 µm thick at the upper flank to margin; cortical cells hemispherical to pyriform, 14–16 × 9–11 µm at base, becoming smaller to 10–12 × 7–9 µm toward the upper flank to margin, containing refractive vacuoles in the protruding cells when mounted fresh in water. Medullary excipulum 25–50 µm thick. Asci (50–)65–82(–85) × 5–9 µm, arising from croziers, with MLZ + apical pore. Ascospores 15–22(–27.5) × 2.5–3.5 µm, long fusiform, with acute apices, (1–)3(–4)-septate, containing abundant guttules, often 2–3(–4) large guttules and several smaller ones. Paraphyses (65–)70–85(–93) × 2.5–3 µm, simple, 2–3-septate, apical cells containing long refractive vacuoles when mounted fresh in water. Subiculum thinly covering the surface of substrates in patches, sparse to moderately abundant around the scuta and apothecia, shiny brown; subicular hyphae straight to curved, usually 3–5 µm diam., with 0.5–1 µm thick-walls, septate every 15–25 µm, perpendicularly branched, covered by gelatinous substance, forming bulbils of 30–45 µm across in the middle or tip, composed of densely aggregated globular or moniliform thick-walled cells, dark brown. Colony of NBRC 115570 on PDA moderately undulate, superficial, cottony to hairy, brownish gray (C20–40M40Y40K60) from the surface, zonation only observed from the reverse, without soluble pigment and crystals; aerial mycelium densely fascicular, white. Conidiophores aggregated in inconspicuous clusters on aerial hyphae, (semi-)macronematous, constricted, arising vertically or laterally from hyphae, pale to dark brown, smooth, thick-walled, frequently branched; phialides ampulliform with determinate collarettes, up to 15 µm long, approximately 4 µm width at base, discrete to integrated, terminal or intercalary, pale brown, thick-walled, with cylindrical to wide funnel-shape collarettes of 5–8 × 2.5–3 µm; conidia aseptate, spherical to subspherical, 2–2.5 µm diam., hyaline, thin-walled.
Additional specimen examined
TNS-F-86671, Kawazu City, Kamo County, Shizuoka Pref., 16 October 2021, on decaying culm of M. sinensis, culture NBRC 115666.
Notes
Neobelonopsis acutata resembles Belonopsis graminea (P. Karst.) Sacc. & P. Syd., which has a whitish disc that turns yellowish when dried, asci, ascospores and paraphyses with overlapped biometry (Karsten 1871[1]). However, N. acutata differs from B. graminea in its amyloid asci. Belonopsis graminea produces densely aggregated conidiophores (approximately 0.2 mm across, “spermogonium” sensu Karsten) and cylindrical to elongated fusiform conidia (8–10 × 1.5 µm, “spermatia” sensu Karsten) (Karsten 1871[1]), while N. acutata has sparsely aggregated conidiophores and spherical conidia (Figs 3M, 14A).
Original Description
- Itagaki, H; Hosoya, T; 2023: A new genus Neobelonopsis and two new species of Trichobelonium (Helotiales, Ascomycota) discovered mainly from poaceous grasses native to Asia in Japan MycoKeys, 99: 45-85. doi
Images
|
Other References
- ↑ 1.0 1.1 Karsten P (1871) Mycologia Fennica. Pars prima. Discomycetes. Bidrag Till Kännedom Af Finlands Natur Och Folk, utgifna af Finska Vetenskaps-Societeten, 19: 1–264. Finska Litteratur–sällskapets tryckeri, Helsingfors.
