taxonID	type	description	language	source
401187C2A447A819E8EB976477E103D3.taxon	description	(Figure 2). MycoBank number: MB 843383	en	Ilyukhin, Evgeny, Markovskaja, Svetlana (2023): Helminthosporium paraoligosporum sp. nov., a new ascomycetous fungus from Ontario, Canada. Phytotaxa 607 (2): 151-159, DOI: 10.11646/phytotaxa.607.2.4, URL: http://dx.doi.org/10.11646/phytotaxa.607.2.4
401187C2A447A819E8EB976477E103D3.taxon	etymology	Etymology: — Refers to Greek prefix ‘ para’ meaning ‘ close’, and latin ‘ oligosporum’ is the species name of Helminthosporium oligosporum.	en	Ilyukhin, Evgeny, Markovskaja, Svetlana (2023): Helminthosporium paraoligosporum sp. nov., a new ascomycetous fungus from Ontario, Canada. Phytotaxa 607 (2): 151-159, DOI: 10.11646/phytotaxa.607.2.4, URL: http://dx.doi.org/10.11646/phytotaxa.607.2.4
401187C2A447A819E8EB976477E103D3.taxon	materials_examined	Type: — CANADA, Ontario, Short Hills Provincial Park, 43 ° 06 ’ 23.1 ” N 79 ° 16 ’ 29.6 ” W, on fallen branches of Tilia sp., 03 August 2020, E. Ilyukhin, EI- 102, (BILAS 51717, holotype), ex-type culture = BILAS 51718, isotype DAOM 984992	en	Ilyukhin, Evgeny, Markovskaja, Svetlana (2023): Helminthosporium paraoligosporum sp. nov., a new ascomycetous fungus from Ontario, Canada. Phytotaxa 607 (2): 151-159, DOI: 10.11646/phytotaxa.607.2.4, URL: http://dx.doi.org/10.11646/phytotaxa.607.2.4
401187C2A447A819E8EB976477E103D3.taxon	description	Saprobic on branches of Tilia spp. Sexual morph: undetermined. Asexual morph: Colonies on substrate scattered, some grouped, consisted of black conidiomata. Conidiomata 0.25 – 1.90 mm wide, 170 – 750 μm high (n = 10), stromatic, erumpent, hemispherical, circularly arranged, with branched, thick-walled (4 – 5 μm) hyphae. Conidiophores semimicronematous or micronematous, sometimes reduced to elongated conidiogenous cells 7.5 – 9 × 18 – 29 (– 37) μm (n = 20), grouped, erect, cylindrical with widened base and slightly swollen apex, septate, smooth, dark brown, with apical pore. Conidia 13.5 – 17.5 × (56 –) 64 – 76 (– 88) μm (n = 50), clavate or obclavate, straight, some slightly curved, smooth, with 6 – 9 septa, dark brown, paler at apical part.	en	Ilyukhin, Evgeny, Markovskaja, Svetlana (2023): Helminthosporium paraoligosporum sp. nov., a new ascomycetous fungus from Ontario, Canada. Phytotaxa 607 (2): 151-159, DOI: 10.11646/phytotaxa.607.2.4, URL: http://dx.doi.org/10.11646/phytotaxa.607.2.4
401187C2A447A819E8EB976477E103D3.taxon	distribution	Known distribution: — Ontario, Canada.	en	Ilyukhin, Evgeny, Markovskaja, Svetlana (2023): Helminthosporium paraoligosporum sp. nov., a new ascomycetous fungus from Ontario, Canada. Phytotaxa 607 (2): 151-159, DOI: 10.11646/phytotaxa.607.2.4, URL: http://dx.doi.org/10.11646/phytotaxa.607.2.4
401187C2A447A819E8EB976477E103D3.taxon	biology_ecology	Culture characteristics: — colonies slow-growing (16 mm) on MEA at room temperature in the dark after 14 days, initially white, with thick texture, turning pale pink, without aerial mycelium; reverse side beige. Rare pycnidia develop after 21 days of incubation, whitish to pale grey, 350 – 650 μm wide, solitary, mainly globose. Conidia (2.8 –) 3.1 – 3.7 × (1.0 –) 1.1 – 1.4 (– 1.6) μm (n = 50), 1 - celled, allantoid, hyaline, smooth.	en	Ilyukhin, Evgeny, Markovskaja, Svetlana (2023): Helminthosporium paraoligosporum sp. nov., a new ascomycetous fungus from Ontario, Canada. Phytotaxa 607 (2): 151-159, DOI: 10.11646/phytotaxa.607.2.4, URL: http://dx.doi.org/10.11646/phytotaxa.607.2.4
401187C2A447A819E8EB976477E103D3.taxon	materials_examined	Additional specimens examined: — CANADA, Ontario, Vicinities of Welland Canal, 43 ° 13 ’ 07.3 ” N 79 ° 12 ’ 53.5 ” W, on branches of Tilia cordata, 16 October 2021, E. Ilyukhin, EI- 418, BILAS 51719, living culture = BILAS 51720.	en	Ilyukhin, Evgeny, Markovskaja, Svetlana (2023): Helminthosporium paraoligosporum sp. nov., a new ascomycetous fungus from Ontario, Canada. Phytotaxa 607 (2): 151-159, DOI: 10.11646/phytotaxa.607.2.4, URL: http://dx.doi.org/10.11646/phytotaxa.607.2.4
401187C2A447A819E8EB976477E103D3.taxon	discussion	Notes: — Phylogenetically, the new species is most closely related to H. oligosporum collected from Tilia spp. in different countries of Europe (Voglmayr & Jaklitsch, 2017). Morphologically, the two species are very similar, but conidia of H. paraoligosporum (56 – 88 μm) appear to be slightly shorter than those of H. oligosporum (37 – 124 μm). The culture of P. oligosporum grown on MEA under the same conditions lacks rosy color (Voglmayr & Jaklitsch, 2017) which also differs these two species. Morphological characteristics and phylogenetic analysis indicated that the strains EI- 102 and EI- 418 represent a new species in the genus Helminthosporium.	en	Ilyukhin, Evgeny, Markovskaja, Svetlana (2023): Helminthosporium paraoligosporum sp. nov., a new ascomycetous fungus from Ontario, Canada. Phytotaxa 607 (2): 151-159, DOI: 10.11646/phytotaxa.607.2.4, URL: http://dx.doi.org/10.11646/phytotaxa.607.2.4
