Buellia viridula
Buellia viridula Ekanayaka & K.D. Hyde, in Hyde et al., Fungal Diversity: 10.1007/s13225-019-00429-2, [120] (2019)
Index Fungorum number: IF555467 Facesoffungi number: FoF05082
Sexual morph: Apothecia 300–350 × 110–160 µm (x̄ = 331.7 × 132.6 µm, n = 10), arising singly, erumpent, sessile, black when fresh. Receptacle pulvinate, black. Disc flat to slightly convex, black. Margins black. Excipulum 22–38 µm (x̄ = 31.5 µm, n = 10) wide at margins and flanks, composed of black cells of textura angularis. Hymenium blackish green. Paraphyses 1–3 µm wide (x̄ = 2.1 µm, n = 20), numerous, branched, septate. Asci 24–50 × 8–14 µm (x̄ = 34.3 × 10.4 µm, n = 30), 8-spored, globose, long stipitate, apex rounded, inoperculate, amyloid ring absent at the apex. Ascospores 7–11 × 3–4 µm (x̄ = 9.5 × 3.7 µm, n = 40), multiseriate, obovoid, immature spore hyaline, greenish brown at maturity, smooth-walled, 1-septate, guttules present. Asexual morph: Undetermined.
Host and Habitat: Saprobic on dead stem of woody plant.
Known distribution: Thailand.
Material examined: THAILAND, Chiang Rai Province, Doi Mae Suai, on dead stems, 22 June 2015, A.H. Ekanayaka, HD0026 (MFLU 16-0587 holotype; HKAS 104247, isotype).
GenBank Accession No: ITS: MK075947 (MFLU 16-0587-a), MK075948 (MFLU 16-0587-b).
Figure X. Buellia viridula (MFLU 16-0587, holotype). a Substrate. b, c Ascomata on wood. d Cross section of an ascoma. e Close up of the cross section of ascoma at margins. f Cylindrical paraphyses. g–j Cylindric-clavate asci. k–n Obvoid ascospores. Scale bars: b = 500 µm, d = 150 µm, c = 100 µm, e = 60 µm, f = 20 µm, g–j = 10 µm, k–n = 5 µm.
Notes: Buellia viridula is characterized by sessile black apothecia, a blackish excipulum, a blackish green hymenium, globose asci and ellipsoid greenish ascospores. Buellia viridula is similar to B. ocellata and B. jugorum by having coloured hymenium, but the latter two species have ornamented ascospores (Scheidegger 1993). The phylogenetic analysis clearly establishes B. viridula as a new species (Hyde et al. 2019).
Reference:
1. Hyde KD, Tennakoon DS, Jeewon R, Bhat DJ et al. (2019) Fungal diversity notes 1036–1150: taxonomic and phylogenetic contributions on genera and species of fungal taxa. Fungal Divers. 96: 1–242.
2. Scheidegger C (1993) A revision of the European saxicolous species of the genus Buellia De Not. and formerly included genera. Lichenologist 25:315–364.
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