Paramphibambusa guizhouensis Q.R. Li, 2025

Zeng, Lina, Lu, Changtao, Li, Qirui, Khurshid, Rubab, Habib, Kamran & Lu, Pingzhu, 2025, Paramphibambusa guizhouensis sp. nov. (Cainiaceae, Xylariales) a bambusicolous ascomycete from Guizhou, China, Phytotaxa 708 (2), pp. 208-218 : 212-215

Paramphibambusa guizhouensis Q.R. Li sp. nov. Fig. 2

MycoBank MB859156

Etymology: —The specific epithet “ guizhouensis ” refers to Guizhou Province, China, where the new taxon was collected.

Diagnosis:— Characterized by absence of longitudinal striations or germ slits on ascospores.

Holotype:— CHINA. Guizhou Province: Zunyi city, Xishui Country (28°19'22.23"N, 106°13'35.71"E), at 1166 m a.s.l., on dead culms of bamboo, 21 March 2024, Changtao Lu, Herb. 2024XS47 (GMB4908). GenBank accession ITS: PV626725 , LSU: PV626728 , rpb2: PV637405, TUB2 : PV637403, tef1α: PV637407.

Description:— Saprobic on decaying culm of bamboo, forming black round spots. Sexual morph : Ascomata 635–850 × 430–600 µm (x̅ = 733 × 529 µm), deeply immersed in host tissue, clypeus absent, solitary, scattered, black, subglobose, ostiole central, black, with a conical neck. Peridium 38 – 84 µm (x̅ = 46 µm) wide, thick-walled, comprised of two layers, outer layer dark brown, inner hyaline, cells of textura angularis. Paraphyses 1.6–4.4 µm (x̅ = 3.1) wide, hyaline, cylindrical, multi-guttulate, septate, unbranched. Asci 130–210 × 8.1–14.4 µm (x̅ = 174.8 × 11.0 um), 8-spored, cylindrical, unitunicate, short-pedicellate, apically rounded, with a trapezoidal, J+, apical ring, 1.7–2.2 × 3.4–4.4 µm (x̅ = 1.7× 3.4 µm). Ascospores 18.4–29.3 × 4.8–7.5 µm (x̅ = 24.5× 6.0 µm), lacking longitudinal striations, golden to light brown, unitunicate, smooth-walled, fusiform, rounded at ends, 1-septate at the centre, slightly constricted at the septum, often guttulate, surrounded by 1.0–7.7 µm (x̅ = 3.4 µm) thick mucilaginous sheath. Asexual morph : undetermined.

Habit and habitat: —Found on dead culms of bamboo in humid subtropical climate.

Additional material examined: — CHINA. Guizhou Province: Zunyi city, Xishui Country (28°19'25.23"N, 106°14'77.28"E), at 1099 m a.s.l., on dead culms of bamboo, 23 March 2024, Changtao Lu, Herb. 2024XS106 (GMB4909). GenBank accession ITS: PV626726, LSU: PV626727, rpb2: PV637406, TUB 2: PV637404, tef1α: PV637408.

Figures

FIGURE 2. Morphoanatomy of Paramphibambusa guizhouensis (GMB4908). A. Bamboo specimen. B. Ascomata immersed under the host surface. C. Transverse section of ascoma. D, E. Vertical section of ascomata. F. Peridium. G–I. Asci. J. Paraphysis. K. Apical ring bluing in Melzer’s reagent. L, M. Ascospores. N. Ascospore showing mucilaginous sheath. Scale bars: B–D = 0.2 mm, E = 100 μm, F–N = 10 μm.