Sporothrix roztoczensis R. Jankowiak & P. Bilanski, 2023
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publication ID |
https://dx.doi.org/10.3897/mycokeys.97.97416 |
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persistent identifier |
https://treatment.plazi.org/id/D965ECFC-5911-5E5F-B542-053283FD52EB |
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treatment provided by |
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scientific name |
Sporothrix roztoczensis R. Jankowiak & P. Bilanski |
| status |
sp. nov. |
Sporothrix roztoczensis R. Jankowiak & P. Bilanski sp. nov.
Fig. 6 View Figure 6
Etymology.
Referring to the highland (from Polish: Roztocze) located in eastern Poland where this fungus was collected.
Diagnosis.
Sporothrix roztoczensis differs from the phylogenetically closely related species S. dimorphospora and S. silvicola with respect to its conidia dimensions.
Type.
Poland, Lubelskie Province, Józefów, from wood buried in soil under 58-year- old managed Pinus sylvestris forest, July 2015, Ł. Chyrzyński (O-F- 259436 holotype, culture ex-type CBS 147973) .
Description.
Sexual morph not observed. Asexual structures produced on sterilized Scots pine twigs placed on the surface of malt agar in Petri dishes. Conidiophores hyaline, one-celled, micronematous, simple or branched, either borne on vegetative hyphae or on upright hyphae. Conidiogenous cells blastic, cylindrical, terminal, lateral or intercalary, straight or curved, constricted at the base and tapering towards the apex, (2.3-)6.6-32.8(-50.5) μm long, (0.6-)1.1-1.6(-2) μm wide at the base, apical part forming conidia by sympodial proliferation on swollen a cluster of conidium-bearing denticles, (0.9-)1.6-3.3(-5) μm long and (1-)1.9-3.9(-6.2) μm wide, denticles very seldom arise below the swollen cluster. Conidia of two types: 1) abundant in cultures, hyaline, unicellular, smooth, ellipsoid, guttuliform, pointed at the base, sometimes curved (2.5-)3.2-5.1(-7) × (1.4-)1.6-2.1(-2.5) μm, formed directly on denticles; 2) abundant in cultures, subhyaline to lightly pigmented, unicellular, globose to subglobose, sometimes pointed at the base, (2.5-)2.9-3.6(-4.1) μm in diameter, formed singly, on lateral or intercalary conidiogenous cells or denticles directly emerging from vegetative hyphae.
Culture characteristics.
Colonies with optimal growth at 20 °C on 2% MEA reaching an average of 31.3 mm ( ± 3.98 mm) after 14 days, with a radial growth rate of 0.87 ( ± 0.14) mm/d, growth somewhat slower at 15 °C (26.3 mm diameter), no growth at 30 and 35 °C; white gray, floccose, flat, growing in a circular pattern with entire margins.
Distribution.
Known only from the type location (Poland).
Additional specimen examined.
Poland, Lubelskie Province, Józefów, from wood buried in soil under 88-year-old managed Pinus sylvestris forest, July 2015, Ł. Chyrzyński (O-F-259435, culture CBS 147972).
Notes.
This species is phylogenetically distinct from the other Sporothrix species based on the TUB 2, CAL, and TEF 1 sequences. Sporothrix roztoczensis is closely related to S. dimorphospora , and S. silvicola sp. nov. Sporothrix silvicola has larger sympodial conidia (3.2-10.4 × 1.4-3.6 μm) compared with S. dimorphospora (3-8 × 1.5-3 μm, Madrid et al. 2010) and S. roztoczensis (2.5-7 × 1.4-2.5 μm). In addition, denticles in S. silvicola arise abundantly below the swollen cluster compared with other species, where denticles are limited to the apical cluster. Also the shape of pigmented conidia differed. In S. roztoczensis they are globose or subglobose while more obovoid in S. dimorphospora and S. silvicola . Conidia of S. roztoczensis are smaller (2.5-4.1 μm in diam.) compared to S. dimorphospora (3-5 × 3.5 μm) and S. silvicola (2.6-4.8 × 1.4-3.9 μm). In addition, S. roztoczensis rarely produced intercalary conidiogenous cells, which are commonly found in culture of S. silvicola .
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