Auriculariales » Auriculariaceae » Heterocorticium

Heterocorticium bambusicola

Heterocorticium bambusicola S.H. He, T. Nie & Yue Li 2023, in Li et al., Journal of Fungi, 9(318), 7, (2023).

Etymology: refers to its preferred substrate, bamboo.

Diagnosis: Basidiomes annual, resupinate, effused, closely adnate, inseparable from substrate, coriaceous, first as small colonies, later confluent up to 20 × 5 cm, up to 120 µm thick in section. Hymenophore smooth, orange white (6A2), orang grey (6B2), greyish orange [6B (3–6)] to brownish orange [6C (3–6)], not cracked; margin thinning out or abrupt, distinct and white (6A1) when juvenile, indistinct and concolorous with hymenophore when mature. Microscopic structures—Hyphal system monomitic; generative hyphae with clamp connections. Subiculum thin, with many crystals adjacent to substrate; hyphae in this layer colorless, thin-walled, frequently branched and septate, slightly agglutinated, densely interwoven, 1–3 µm in diam. Cystidia absent. Dikaryophyses numerous, forming a light brown layer in hymenium, colorless, thin-walled, frequently branched. Basidia embedded, ovoid to subglobose, longitudinally septate, four-celled, without enucleate stalk, 13–20 × 9–11 µm. Basidiospores cylindrical with a distinct apiculus, slightly curved, colorless, thin-walled, smooth, IKI–, CB–, with oily contents, capable of germinating by repetition, 10–14 × 5–6 µm, L = 11.5 µm, W= 5.5 µm, Q = 1.8–2.4 (n = 60/2).

Index Fungorum Number: IF847442

Notes: Heterocorticium bambusicola is widely distributed in southern China on bamboo and was also found in Malaysia. It is characterized by thin, resupinate, coriaceous basidiomes, smooth hymenophore, and well-developed dikaryophyses. The other species in the genus, H. latisporum, differs from H. bambusicola by having grayish brown hymenophore and wider basidiospores.

Figure 1. Phylogenetic tree of MP analysis from the concatenated ITS-28S sequences of Auriculariaceae taxa. Branches are labelled with parsimony bootstrap values (≥ 50%, first), likelihood bootstrap values (≥ 50%, second), and Bayesian posterior probabilities (≥ 0.95, third). New species and new combinations are set in bold.

Figure 2. Micrographs of basidia and basidiospores (in phloxine and KOH). Scale bar = 10 µm. (A). Heterocorticium bambusicola (holotype, He 4236, BJFC 023678); (B). Heterocorticium latisporum (holotype, He 20120923-20, BJFC 014667); (C). Eichleriella alpina (holotype, He 20120916-1, BJFC 014581); (D). Eichleriella bambusicola (holotype, He 4073, BJFC 023514); (E). Heteroradulum maolanense (holotype, He 4773, BJFC 024290); (F). Heteroradulum labyrinthinum (He 20120722-1, BJFC 014502).

Figure 3. Basidiomes of Heterocorticium bambusicola. Scale bars: (A–H) = 1 cm. (A). He 3341 (BJFC021736); (B). He 3344 (BJFC 021739); (C). He 3359 (BJFC 021754); (D). He 4234 (BJFC 023676); (E). He 4604 (BJFC 024046); (F). He 4607 (BJFC 024049); (G). He 6293 (BJFC 033237); (H). He 6435 (BJFC 033379).

Figure 4. Heterocorticium bambusicola (from the holotype, He 4236, BJFC 023678). Scale bars: (A–D) = 10 µm. (A). Basidiospores; (B). Basidia; (C). Dikaryophyses; (D). Generative hyphae.

 

Reference:

Li, Y., Nie, T., Nakasone, K. K., Li, H. J., & He, S. H. (2023). Taxonomy and Phylogeny of Corticioid Fungi in Auriculariaceae (Auriculariales, Basidiomycota): A New Genus, Five New Species and Four New Combinations. Journal of Fungi, 9(3), 318.

 

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