Hysteriales » Hysteriaceae » Hysterobrevium

Hysterobrevium constrictum

Hysterobrevium constrictum (N. Amano) E. Boehm & C.L. Schoch, in Boehm et al., Stud. Mycol. 64: 64 (2009)

Facesoffungi number: FoF 06461;

≡ Gloniopsis constricta N. Amano, Trans. Mycol. Soc.

Japan 24(3): 289 (1983)

Holotype: JAPAN, Yunohana Onsen, Tateiwa-mura,

Minaimiaizu-gun, Fukushima Pref., Y. Doi, 18 September

1982, F-237162.

Sexual morph: Ascomata 350–450 μm high, 700–1000 μm long, apothecial, arising singly or in small groups, sessile, slightly erumpent from the substrate. Receptacle cupulate, black, hysteriform. Disc concave, black when fresh. Margins black. Excipulum 35–50 μm wide, ectal excipulum carbonaceous, thickwalled, black cells of textura globulosa to angularis, medullary excipulum composed of narrow, long, thin-walled, hyaline to brownish cells of textura porrecta. Hymenium hyaline. Pseudoparaphyses numerous, branched, septate. Asci 115–130 × 25–32 μm, 8-spored, short pedicellate, rounded at the apex, J-, croziers abscent at the asci base. Ascospores 27–35 × 10–12 μm, multi-seriate, hyaline, smooth-walled, ellipsoid to fusoid, muriform. Asexual morph: Undetermined.

Material examined: CHINA, Yunnan Province, Kunming City, Kunming Institute of Botany, Botanical garden, on dead stems, 24 May 2018, A.H. Ekanayaka, HC13 (KUN-HKAS102101).

Known host and distribution: Lonicera xylosteum, Populus tremula, Quercus robur (Sweden), on decaying wood (Thailand, Japan, China and New Zealand) (Boehm et al. 2009; Farr and Rossman 2020).

GenBank Accession No: ITS = MN429070, LSU = MN429073, SSU = MN420986, TEF1-α = MN442088.

Notes: This species is characterised by sessile, erumpent, naviculate apothecia, cylindrical asci and hyaline, muriform ascospores. In the comparison of ITS sequence, our new strain shows 93% (443/478 bp) similarity to Hysterobrevium mori (Schwein.) E. Boehm & C.L. Schoch (MFLUCC 14–0520) but differs from 35 base pairs including eight gaps. Phylogenetic analyses of the combined LSU, SSU, ITS and TEF1-α sequence dataset showed that our strain forms a robust clade with H. constrictum (GKM426N) with high support (96% ML, 0.99 BYPP). Moreover, our strain is also similar to the description of H. constrictum provided by Boehm et al. (2009) except in having slightly larger ascospores. We therefore, identify our taxon as H. constrictum from Yunnan, China.