Eutypella naqsii K.D.Hyde

Dayarathne, Monika C., Wanasinghe, Dhanushka N., Devadatha, B., Abeywickrama, Pranami, G, E. B., Jones, areth, Chomnunti, Putarak, Sarma, V. V., Hyde, Kevin D., Lumyong, Saisamorn, C., Eric H. & Mckenzie, 2020, Modern taxonomic approaches to identifying diatrypaceous fungi from marine habitats, with a novel genus Halocryptovalsa Dayarathne & K. D. Hyde, gen. nov., Cryptogamie, Mycologie 20 (3), pp. 21-67 : 49

Eutypella naqsii K.D.Hyde

( Fig. 13 )

Mycological Research 99 (12): 1462 (1995).

MATERIAL EXAMINED. — Australia, north Queensland, Bathurst Heads, on intertidal branch of Avicennia sp. , VII.1991, K. D. Hyde (holo-, BRIP[BRIP-22588]).

DISTRIBUTION. — Australia.

DESCRIPTION

Sexual morph

Stromata. Forming a blackened crust on the host surface, with ectostromatal cushions occurring around each ascoma, comprising host cells and intracellular blackened fungal hyphae.

Ascomata. 460-500 × 550-650 µm, forming beneath, raised stromata on the host surface, with 3-5 ascomata per stroma, globose or subglobose, with periphysate necks collectively erumpent through pustulate discs.

Peridium. 50-70 µm wide, comprising an inner layer of thin-walled, compressed, hyaline cells and an outer layer of pigmented, globose, fungal and host cells, fusing with the stroma at the outside.

Paraphyses. 5-7 µm wide at the base, hypha-like, sparse, septate, hyaline, and tapering distally.

Asci. 30-40 × 4-6 µm, 8-spored, cylindric-clavate, long pedunculate, thin-walled, unitunicate, apically truncate, with J- apical ring, asci forming from the base and sides of the ascoma.

Ascospores. 6-8 × 1-2 µm, allantoid, straight or mostly curved, hyaline to pale yellow.

Asexual morph

Undetermined.

NOTES

This taxon has characteristics typical of Eutypella such as small groups of ascomata, which develop under blackened stroma with necks collectively erumpent through a pustulate disc; which splits at maturity to reveal an inconspicuous powdery white ring a faint ridge may ring the pustule where the black zone meets the inner surface of the bark. Asci are also unitunicate with an apical thickening and ascospores are hyaline and allantoid ( Wehmeyer 1976; Rappaz 1987; Hyde 1995 ).

Figures

FIG. 13. — Eutypella naqsii K.D.Hyde (BRIP 22588, holotype). A, herbarium material; B, horizontal section through ascostroma; C, D, vertical section through ascoma; E, peridium; F, paraphyses; G-I, asci; J-N, ascospores. Scale bars: B, 1000 μm; C, 500 μm; D,100 μm; E, F-I, 20 μm; J, 10 μm; K-N, 5 μm.