Terriera meitanensis J.F. Zhang & Z.Y. Liu,

Zhang, Jin-Feng, Liu, Jian-Kui, Hyde, Kevin D., Ekanayaka, Anusha H. & Liu, Zuo-Yi, 2020, Morpho-phylogenetic evidence reveals new species in Rhytismataceae (Rhytismatales, Leotiomycetes, Ascomycota) from Guizhou Province, China, MycoKeys 76, pp. 81-106: 81

publication ID

http://dx.doi.org/10.3897/mycokeys.76.58465

persistent identifier

http://treatment.plazi.org/id/7364F767-3A22-50BE-908E-A87521B1B7B4

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MycoKeys by Pensoft

scientific name

Terriera meitanensis J.F. Zhang & Z.Y. Liu
status

sp. nov.

Terriera meitanensis J.F. Zhang & Z.Y. Liu  sp. nov. Figure 4View Figure 4

Holotype.

MFLU 18-2299.

Etymology.

Referring to the locality of the holotype, Meitan County, Guizhou Province, China.

Description.

Apothecia developing on dead stems (Fig. 4aView Figure 4), semi-immersed to superficial, elliptical or oblong-elliptical, ends slightly acute to obtuse, surface black, matt, raising the substratum surface, opening by a single longitudinal split that extends nearly the entire length (Fig. 4b, cView Figure 4). In median vertical section (Fig. 4dView Figure 4), apothecia deeply embedded in host tissue, with host cells becoming filled with fungal tissue as the apothecium develops. Covering stroma (Fig. 4eView Figure 4) 33-42 µm thick, composed of blackish-brown, thick-walled cells that are fused with host tissue in the outermost layers, becoming pale pigmented or nearly colourless towards the hymenium, thin-walled cells, arranged in textura angularis or textura globulosa. Along the upper edge of the apothecial opening, there is a flattened, 19-34 µm thick extension adjacent to the covering stroma that is composed of strongly melanised tissue with no obvious cellular structure. Basal stroma (Fig. 4gView Figure 4) 8-18 µm thick, dark-brown or blackish-brown, composed of angular to globose, thick-walled cells, 2.5-4 µm diam. Where the covering stroma meets the basal stroma, there is a triangular-shaped, 35-60 µm thick, tissue composed of thin-walled, hyaline to pale brown cells forming a textura prismatica (Fig. 4fView Figure 4). Subhymenium 12-16 µm thick, consisting of hyaline textura angularis to textura intricata. Paraphyses 1-2 µm, filiform, hyaline, septate, gradually swollen or branching once at the apex, embedded in gelatinous matrix, anastomosing at the base. Asci (98.5-)113-125.5(-131.5) × 6-7.5 µm (x ¯ = 117 × 6.5 µm, n = 20), 8-spored, unitunicate, cylindrical, somewhat long-stalked, thin-walled, apex generally truncate, J-, without circumapical thickening. Ascospores 47-54.5 × 1.5-2.5 µm (x ¯ = 50.5 × 2 µm, n = 35), fascicle, filiform, gradually tapering towards the ends, hyaline, aseptate, smooth-walled, straight or slightly curved, lacking a gelatinous sheath. Asexual morph: Not observed.

Material examined.

CHINA, Guizhou Province, Zunyi, Meitan County, dead stems of unidentified host, 28 August 2017, J.F. Zhang, MT-1 ( MFLU 18-2299, holotype); ibid. (GZAAS 19-1731, isotype).

Notes.

In our phylogenetic analysis (Fig. 1View Figure 1), Terriera meitanensis  is placed in a robust clade with T. camelliicola  , T. elliptica  , T. karsti  and T. thailandica  by strong statistical support (MPBP 100% and BYPP 1.00). Terriera meitanensis  has larger asci than T. camelliicola  and T. thailandica  , while the ascospores of T. meitanensis  are smaller ( Johnston 2001; Hyde et al. 2016). Both T. meitanensis  and T. karsti  share similar-sized asci, but T. karsti  has larger ascospores (47-54.5 × 1.5-2.5 µm vs. 55-66 × 1.5-2.0 µm). Terriera meitanensis  differs from T. elliptica  by its obviously smaller asci (113-122.5 × 6-7.5 µm vs. 135-175 × 7-9 µm) and ascospores (47-54.5 × 1.5-2.5 µm vs. 60-85 × 1.5-2 µm) ( Zhang et al. 2015). Moreover, the ascospores of T. camelliicola  and T. elliptica  are enveloped by a gelatinous sheath, respectively, while this is not observed in T. meitanensis  . In addition, the comparison of the ITS gene region is processed between T. meitanensis  and its closest species T. elliptica  , based on the recommendations from Jeewon and Hyde (2016) and the results showed that there are 15/489 bp (3%) differences. Therefore, we introduce T. meitanensis  herein as a new species, based on morphological and molecular evidence.