Polyporales » Phanerochaetaceae » Callosus

Callosus wenshanensis

Callosus wenshanensis C.L. Zhao 2023, in Chen et al., Mycotaxon, 137, 435-448 (2022).

Etymology: wenshanensis (Lat.) refers to the provenance of the specimens.

Diagnosis: Basidiomata annual, resupinate, membranous, without odor or taste when fresh, becoming hard membranous and fragile upon drying, ≤10 cm long, 2.5 cm wide, 1 mm thick. Hymenial surface smooth, white to cream-colored when fresh, becoming cream-colored and cracking upon drying. Margin sterile, narrow, 1 mm wide, white to cream. Hyphal structure monomitic; generative hyphae with simple septa, colorless, thin- to thick-walled, unbranched, 1.5–2.3 μm in diameter, IKI–, CB–; tissues unchanged in KOH. Subiculum subhymenium and subiculum distinct, subicular hyphae loosely arranged, subhymenium covered with crystals. Hymenium cystidia capitate, colorless, thin-walled, progressively broader towards the top, 23.5–27.2 × 3.2–3.7 μm. Basidia clavate to cylindrical, with four sterigmata, 16.2–17.1 × 2.7–3.4 μm, basidioles dominant, similar in shape to basidia, but slightly smaller. Basidiospores ellipsoid, colorless, thin-walled, smooth, with 1–2 bubbles, IKI–, CB–, 2.3–3.9 (–4.1) × 1.4–2.3 μm, L = 3.02 μm, W = 1.73 μm, Q = 1.68–1.82 (n = 60/2). Type of rot: white rot

Index Fungorum Number: IF838559

Figure 1. Maximum parsimony strict consensus tree illustrating the phylogeny of Callosus wenshanensis and related genera in Phanerochaetaceae based on ITS+nLSU sequences. Generic names follow Floudas & Hibbett (2015). Branches are labelled with maximum likelihood bootstrap value >70%, parsimony bootstrap value >70% and Bayesian posterior probabilities >0.95.

Figure 2. Maximum parsimony strict consensus tree illustrating the phylogeny of Callosus wenshanensis and related species in Phanerochaetaceae based on ITS+nLSU sequences. Generic names follow Justo et al. (2017). Branches are labelled with maximum likelihood bootstrap value >70%, parsimony bootstrap value >70% and Bayesian posterior probabilities >0.95.

Figure 3. Callosus wenshanensis (holotype, SWFC 0016017). A. Habit; B. Characteristic hymenophore. Scale bars: A = 1 cm; B = 0.5 cm.

Figure 4. Callosus wenshanensis (holotype, SWFC 0016017). A. Basidiospores; B. Basidia and basidioles; C. Cystidia; D. Section of hymenium. Scale bars: A = 5 μm, B–D = 10 μm.

References:

Chen, R., He, X., & Zhao, C. L. (2022). Callosus wenshanensis gen. & sp. Nov. From China. Mycotaxon, 137, 435-448.

Floudas D, Hibbett DS. (2015). Revisiting the taxonomy of Phanerochaete (Polyporales, Basidiomycota) using a four gene dataset and extensive ITS sampling. Fungal Biology 119, 679–719.

Justo A, Miettinen O, Floudas D, Ortiz-Santana B, Sjökvist E, Lindner D, Nakasone K & al. (2017). A revised family-level classification of the Polyporales (Basidiomycota). Fungal Biology 121, 798–824.

 

 

 

 

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