Xylariales » Diatrypaceae » Diatrypella

Diatrypella yunnanensis

Diatrypella yunnanensis Brahamanage, Thyagaraja & K.D. Hyde, in Hyde et al., Fungal Diversity 100: 226 (2020)

Index Fungorum number: IF556926         Facesofungi number: FoF 07205

Etymology: Name refers to the geographical region “Yunnan” where the species was collected.

Holotype: JZBH3380001

 

Saprobic on unidentified dead wood. Sexual morph: Ascomata solitary and scattered, immersed, raising the substratum, or erumpent. Entostroma efuse, a faint black line between the groups sometimes present, wood hardened; a thin layer of white pulvinate fungal material sometimes present around the ascomal venter. Ascomal venter 360–440 µm high, 245–260 µm wide (x̄ =400 × 255 μm, n=20), at sides 20–30 μm (x̄ =28 μm, n=10), subglobose to broadly ellipsoidal, ostiolate, periphysate, comprising an outer layer of completely melanized cells, and an inner layer of less pigmented, elongate cells; singly erumpent, protruding above the level of the raised substratum; the outermost ascomata in an aggregate often bent towards the centre of the group. Peridium 45–55 μm wide (x̄ =52 μm, n=10), in transverse section with an outer, layer of small, thick-walled, melanized, rounded cells, and an inner layer of hyaline, elongate cells in textura angularis. Paraphyses up to 4–7 µm wide, hyaline, septate, deliquescent. Asci 105–210×15–30 μm (x̄ =170×28 μm, n=20), polysporous, clavate, truncate, pedicellate, with a refractive subapical, J-, ring at the base of an invagination of the ascus apex. Ascospores 18–22×3–4 μm (x̄ =19×3 μm, n=20), allantoid, slightly curved, pale yellow to pale brown. Asexual morph: Undetermined.

 

Material examined: CHINA, Yunnan Province, Kunming Forest Park, on dead and dying twigs of an unidentifed plant, 30 June 2018, V. Thyagaraja, VT 01 (JZBH3380001, holotype).

 

GenBank Accession No: ITS = M N 6 5 3 0 0 8 , TUB2=MN887112.

 

Notes: Diatrypella yunnanensis is phylogenetically related to D. pulvinata Nitschke and D. favacea (Fr.) Ces. & De Not. and grouped within Diatrypella sensu lato(Fig. 149). Diatrypella yunnanensis can be easily distinguished from D. favacea and D. pulvinata by relatively bigger ascomta, asci and ascospores. When comparing the ITS base pair diferences of D. yunnanensis with D. favacea and D. pulvinata, there were 3.4% (18 bp out of 527 bp without gaps) and 1.3% (7 bp out of 527 bp without gaps), respectively. TUB2 base pair diferences between D. yunnanensis and D. pulvinata are 5.3% (23 bp out of 435 bp without gaps). There are no TUB2 sequences generated from D. favacea. We could not obtain a culture for this species as the ascospores did not get germinate in any media used.

 

Figure X.  Diatrypella yunnanensis (JZBH3380001, holotype). a Appearance of stromata on host. b, c Horizontal section through stroma. d Paraphyses. e, f Asci. g Ascospores. Scale bars: d, e=100 μm, f=50 μm, g=20 μm

 

Reference: Hyde KD, Dong Y, Phookamsak R, Jeewon R, Bhat DJ, Jones EB, Liu NG, Abeywickrama PD, Mapook A, Wei D, Perera RH. Fungal diversity notes 1151–1276: taxonomic and phylogenetic contributions on genera and species of fungal taxa.

 

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