Bambusicola autumnalis R. R. Liang, S. N. Zhang and Jian K. Liu 2023, sp. nov.
Creators: name: Liang, Rui-Ru
name: Zhang, Sheng-Nan
name: Liu, Jian-Kui
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Fungi
Ascomycota
Dothideomycetes
Pleosporales
Bambusicolaceae
Bambusicola
Bambusicola autumnalis

description: Bambusicola autumnalis R.R. Liang, S.N. Zhang and Jian K. Liu, sp. nov.   
 MycoBank: 847551; FIGURE 2.   
 Etymology: —The epithet “ autumnalis ” refers to the season “autumn” when the fungus was collected.   
 Holotype:—HKAS 126508   
 Saprobic on dead bamboo branches. Sexual morph: Ascostromata solitary to gregarious, rarely scattered, immersed to erumpent, pseudostromatic, visible as bumped areas with cracks and a central black minute papilla, in vertical section conical to subglobose, ostiolate, periphysate, individual locules 190–325 μm high, 215–295 μm diam (x = 280 × 250 µm, n = 10). Peridium 19–43 μm, composed of several layers of thick-walled, brown cells of textura angularis. Hamathecium 1–1.9 μm wide, trabecular pseudoparaphyses, anastomosing, hyaline, remotely septate. Asci 52–102 × 8–17 µm (x = 71 × 12 µm, n = 20), 8-spored, bitunicate, fissitunicate, long cylindric-clavate, shortly pedicellate, apically rounded with a minute ocular chamber. Ascospores 22–30 × 4.5–7 µm (x = 27 × 5 µm, n = 30), overlapping bi-seriate or multi-seriate, fusiform, 1-septate, constricted at the septum, guttulate, smooth-walled, surrounded by a thin, inconspicuous mucilaginous sheath. Asexual morph: Undetermined.   
 Culture characteristics:—Colonies on PDA reaching 28–32 mm after 4 weeks incubated at 25 °C in dark, circular, dry, mycelium velvety, milky white to pale yellow, reverse yellow to light brown.   
 Material examined:— CHINA, Sichuan province, Chengdu city, Chengdu Botanical Garden, 30°76.48’ N, 104°13.03’ E, 516 m elevation, on dead branches of bamboo in a terrestrial environment, 21 Nov. 2022, R.R. Liang, (HKAS 126508, holotype), ex-holotype living culture CGMCC 3.24280; ibid., HUEST 23.0001, isotype, ex-isotype living culture UESTCC 23.0001.   
 Notes:—Multi-gene phylogenetic analysis showed that our isolates belong to Bambusicola and are closely related to B. guttulata (FIGURE 1). However, it is not able to compare their morphology as the latter species only represented by a coelomycetous asexual morph. Nevertheless, Bambusicola autumnalis differs from B. guttulata in their nucleotide sequences, viz. SSU (6/950), ITS (44/450), LSU (17/800), RPB2 (73/993) and TEF1-α (49/959), respectively. Morphologically, Bambusicola autumnalis resembles B. loculata in having stromatic ascomata, 8-spored, cylindric asci, and narrowly fusiform, 1-septate ascospores surrounded by an inconspicuous sheath (Dai et al. 2015). However, they have different dimensions of asci (52–102 × 8–17 μm vs. 80–105 × 8–13 μm) and ascospores (22–30 × 4.5–7 µm vs. 22–26.5 × 5–6), and the bumped ascostromata with cracks of B. autumnalis also differs from B. loculata. Moreover, the two species are phylogenetically distinct (FIGURE 1).
description: Published as part of Liang, Rui-Ru, Zhang, Sheng-Nan & Liu, Jian-Kui, 2023, Bambusicola autumnalis sp. nov., a bambusicolous ascomycete from Sichuan province, China, pp. 203-211 in Phytotaxa 601 (3) on page 208, DOI: 10.11646/phytotaxa.601.3.1, http://zenodo.org/record/8141736