Alloexidiopsis schistacea
Alloexidiopsis schistacea L.W. Zhou & S.L. Liu 2022, in Li et al., Frontiers in Microbiology, 13 (no. 894641), 1-12 (2022).
Etymology: schistacea (Latin), refers to the slate-like color (grayish) of hymenophore.
Diagnosis: Characterized by grayish hymenophore with small tubercles. Basidiomes annual, resupinate, membranaceous, becoming leathery upon drying, closely adnate, widely effused, up to 15 cm long, 2.5 cm wide, about 200 μm thick. Hymenophore smooth, covered by regularly arranged sterile spines, greyish when fresh. Margin gradually thinning out, thin, concolorous with or slightly darker than subiculum. Hyphal system monomitic; generative hyphae with clamp connections. Subiculum composed of crystal clusters and agglutinated hyphae; subicular hyphae hyaline, thin-walled, frequently branched, closely interwoven, 2–3 μm in diam. Cystidia cylindrical with an obtuse apex, 25–50 × 4–6 μm, with a clamp connection at base. Hyphidia arising from hyphae, nodulose or branched, hyaline, thin-walled, 20–40 × 1.5–3 μm. Basidia ellipsoid to ovoid, longitudinally septate, four-celled, embedded, 15–20 × 7–10 μm. Basidiospores cylindrical to broadly cylindrical, slightly curved (allantoid), hyaline, thin-walled, smooth, acyanophilous, inamyloid, indextrinoid, with oily inclusions, (8.5−)9.5–11(−12.5) × (4.3−)4.5–5.5 μm, L = 10.4 μm,W = 5.0 μm, Q = 2.1 (n = 30/1).
Index Fungorum Number: IF844127
Figure 1. Phylogenetic position of Alloexidiopsis in Auriculariales inferred from the concatenated dataset of internal transcribed spacer (ITS) and nuclear large subunit (nLSU) regions. The topology generated from the maximum likelihood analysis is shown along with bootstrap values and Bayesian posterior probabilities of more than 50% and 0.8, respectively, at the nodes. The new genus Alloexidiopsis is highlighted with the bluish background color, while the specimens of the newly described species are in boldface.
Figure 2. Basidiomes of Alloexidiopsis. (A,B) A. australiensis (LWZ 20180513-22, holotype). (C,D) A. calcea (LWZ 20180904-24). (E,F) A. schistacea (LWZ 20200819-21a, holotype). (G,H) Alloexidiopsis. sp. (LWZ 20180920-16). Scale bars: (A,C,E,G) = 1 cm, (B,D,F,H) = 2 mm.
Figure 3. Microscopic structures of Alloexidiopsis schistacea (drawn from the holotype). (A) A section of hymenium. (B) Basidiospores. (C) Basidia. (D) Cystidia. (E) Hyphidia. Scale bars = 10μm.
Reference:
Liu, S. L., Shen, Z. Q., Li, Q. Z., Liu, X. Y., & Zhou, L. W. (2022). Alloexidiopsis gen. nov., a revision of generic delimitation in Auriculariales (Basidiomycota). Frontiers in Microbiology, 13 (no. 894641), 1-12.
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