Terriera meitanensis J.F. Zhang & Z.Y. Liu, 2020

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

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

sp. nov.

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


MFLU 18-2299.


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


Apothecia developing on dead stems (Fig. 4a View 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, c View Figure 4 ). In median vertical section (Fig. 4d View Figure 4 ), apothecia deeply embedded in host tissue, with host cells becoming filled with fungal tissue as the apothecium develops. Covering stroma (Fig. 4e View 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. 4g View 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. 4f View 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).


In our phylogenetic analysis (Fig. 1 View 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.