Sidera americana Z.B. Liu & Yuan Yuan, 2023
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publication ID |
https://dx.doi.org/10.3897/mycokeys.96.100743 |
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persistent identifier |
https://treatment.plazi.org/id/40F875C7-A56A-590A-9A48-17645AFC29B5 |
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treatment provided by |
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scientific name |
Sidera americana Z.B. Liu & Yuan Yuan |
| status |
sp. nov. |
Sidera americana Z.B. Liu & Yuan Yuan sp. nov.
Figs 2 View Figure 2 , 3 View Figure 3
Diagnosis.
Sidera americana is characterized by annual, resupinate basidiomata with silk sheen when dry, round pores (9-11 per mm), a dimitic hyphal system, and allantoid basidiospores measuring 3.5-4.2 × 1 μm.
Holotype.
USA. Connecticut, New Haven, West Rock Park, on rotten stump of Pinus , 15.VII.2012, Dai 12730 (BJFC 013037, isotype in CFMR).
Etymology.
Americana (Lat.): referring to the species occurring in North America.
Basidiomata.
Annual, resupinate, soft and without odor or taste when fresh, soft corky when dry, up to 14 cm long, 6 cm wide, and approximately 2 mm thick at center; pore surface white when fresh, becoming cream to buff with silk sheen when dry; sterile margin indistinct; pores round, 9-11 per mm; dissepiments thin, lacerate; subiculum very thin to almost absent; tubes concolorous with poroid surface, up to 2 mm long.
Hyphal structure.
Hyphal system dimitic; generative hyphae with clamp connections; skeletal hyphae dominant; all hyphae IKI-, CB-; tissue unchanged in KOH.
Subiculum.
Generative hyphae hyaline, thin-walled, unbranched, 1-2.5 μm in diam; skeletal hyphae dominant, thick-walled with a wide lumen, frequently branched, flexuous, interwoven, 2-3 μm diam.
Tubes.
Generative hyphae hyaline, thin-walled, unbranched, 1-2 μm in diam, dominating at dissepiment edges; skeletal hyphae dominant in tube trama except dissepiment edges, thick-walled with a wide lumen, unbranched, flexuous, interwoven, 2-3 μm diam; rosette-like crystals abundant, 3-12.5 μm in diam; cystidia absent; cystidioles present, fusoid, hyaline, thin-walled, basally swollen, with a sharp or often hyphoid neck, 13.4-15 × 3.2-4 μm; basidia barrel-shaped, hyaline, bearing four sterigmata and with a basal clamp connection, 6-7 × 3-4.2 μm; basidioles in shape similar to basidia, but slightly shorter.
Spores.
Basidiospores allantoid, hyaline, thin-walled, smooth, occasionally with one or two guttules, IKI-, CB-, (3.2-)3.5-4.2(-5) × 1(-1.3) μm, L = 4 μm, W = 1.04 μm, Q = 3.74-3.96 (n = 60/2).
Additional specimen examined.
Canada, Ontario, Hamilton, McMaster University, Botanical Garden, on rotten angiosperm wood, 18-20.VII.2017, Dai 19173 (BJFC 027641).
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