Acervus stipitatus Ekanayaka, Q. Zhao & K.D. Hyde, 2016

Ekanayaka, Anusha H., Zhao, Qi, Jones, E. B. Gareth, Pu, En-Da & Hyde, Kevin D., 2016, Two novel Acervus species extend their distribution within Yunnan, China, Phytotaxa 283 (1), pp. 74-82 : 78

Acervus stipitatus Ekanayaka, Q. Zhao & K.D. Hyde , sp. nov. Fig. 3

Index Fungorum number: IF552370 Facesoffungi number: FoF 02525

Etymology:—The specific epithet stipitatus refers to the apothecial type.

Holotype:— CHINA, Yunnan Province, Xishuangbanna, buffer zone of the Nabanhe National Nature Reserve ( NNNR), N22 ◦ 04ʹ –22 ◦ 17ʹ; E100 ◦ 32ʹ –100 ◦ 44ʹ, 30 August 2015, S.C Karunarathna ( MFLU 16–0607 ).

Diagnosis:—Apothecia stipitate, discoid, deep yellow. Receptacle concave. Hymenium hyaline to yellowish. Paraphyses subcylindrical. Asci unitunicate inoperculate with 8 ellipsoid ascospores.

Description:— Saprobic on dead stems. Sexual morph: Apothecia 3–8 × 3–5 mm (x =5.2 × 3.8 μm, n=10) arising singly, stipitate, discoid, deep yellow (4A8) when fresh. Receptacle concave, disc and margins are yellow to orange when fresh. Hymenium hyaline to yellowish. Ectal excipulum 90–120 μm (x =106.2 μm, n=10) composed of large, thin-walled, hyaline cells of textura globulosa to angularis and medullary excipulum 130–180 μm (x =168.6 μm, n=10) composed of hyaline cells of textura intricata mixed with textura angularis. Paraphyses 3–5 μm (x =3.6 μm, n=20) wide at the middle, hyaline, aseptate, subcylindrical. Asci 120–15 × 7–10 μm (x =140.2 × 9.1 μm, n=30) (length and the width at the middle) unitunicate, inoperculate, cylindrical, long pedicellate, non-amyloid. Ascospore 9–11 × 6–8 μm (x =10.2 × 6.7 μm, n=40), uniseriate, ellipsoid, uniguttulate, hyaline, aseptate, smooth, thin-walled. Asexual morph: Undetermined.

Habitat and Distribution:—solitary on soil with decaying litter under trees, Yunnan Province, China.

Material examined:— CHINA, Yunnan Province, Xishuangbanna, buffer zone of the Nabanhe National Nature Reserve ( NNNR), N22 ◦ 04ʹ –22 ◦ 17ʹ ; E100 ◦ 32ʹ –100 ◦ 44ʹ, 30 August 2015, S.C Karunarathna ( MFLU 16–0607 , holotype) .

Notes:— Acervus stipitatus is distinguished by stipitate, discoid orange yellow apothecia with ellipsoid, uniguttulate ascospores. Acervus stipitatus is morphologically similar to A. xishuangbannicus ( Zhuang & Wang 1998) , but they differ in ascomatal colour and spore shape, size and number of guttules present. The spores of A. stipitatus are ellipsoid, uniguttulate and smaller (9–11 × 6–8 μm) and spores of A. xishuangbannicus are broadly ellipsoid, biguttulate and larger (12.5–13.5 × 9–10 μm) ( Table 2).

Figures

FIGURE 3. Morphology of Acervus stipitatus (holotype). a.Apothecia on dead stem, b. Hymenium and excipulum in vertical section, c–e. Inoperculate asci, f. Hyaline paraphyses, g–j. Hyaline ascospores. Scale bars: a=5 mm, b=100 μm, c–f=30 μm, g–j=10 μm.